Download FES Question Bank

SOUTHERN AFRICAN EMERGENCY SERVICES INSTITUTE.
QUESTIONS FOR:
1.
REQUIRED STUDY MATERIAL:



2.
Success Study Material – Fire Engineering Science 300 Book 1/3
Success Study Material – Fire Engineering Science 300 Book 2/3
Success Study Material – Fire Engineering Science 300 Book 3/3
ADDITIONAL STUDY MATERIAL

3.
HIGHER CERTIFICATE - FIRE ENGINEERING SCIENCE 300 (FES300)
“Basic Introduction to Fire Science” lecture available on SAESI website.
QUESTIONS

Questions MUST be read carefully to ensure clear understanding of the concept and/or
content and apply them as such in your answers, for example:





Describe:
Define:
Discuss:
Give:
List:



Name:
Draw:
Explain:
Name the characteristics of something (a happening, object, method or subject).
Give a concise description of the subject.
Give a complete description of the subject.
Write down names, facts, items, advantages and/or disadvantages. Do not discuss.
Write down names, facts, items, etc. In a specific order or according to specified categories.
Write down names, characteristics, dates, items, components or facts.
Dot out, draw lines, sketch or formulate in graphic form (e.g. a drawing).
Make something more clearly for example by using illustrations, descriptions, examples and/or comparisons.
4.
Study material and revision questions contained in the Success Manuals and SABS Codes of
Practice (Relevant edition) is of vital importance, as it contributes to 100% of the questions.
5.
Question paper is a three (3) hour paper and consisting of Six (6) and ALL of them must be
answered.
6.
All questions add to a total of twenty (20) marks per question with a total of hundred and twenty
marks (120) marks for the whole paper.
7.
Students are advised to attempt all assignments and questions in the study material to obtain more
knowledge on the subject.
8.
Please indicate on the front cover of your answer book the questions answered. Ensure that you
have answered the correct number of questions. If there is questions that must not be marked,
please put a line through such answer.
9.
There is no required length or limit for your answers, unless it is stated so e.g. “an acceptable
format”. Questions can be sufficiently answered in less space, and it is okay to go over, if you think
it improves the response. Keep in mind, however, that a lengthier answer is not necessarily a better
one.
10.
You have an average of thirty (30) minutes for each question. Though grammar and style will not
be a major factor in your grade, there should be a reasonable degree of organization and clarity. It
is advisable to spend a few minutes planning your response, possibly even jotting down a very
simple outline, rather than simply writing off the top of your head. (You may write notes on your
answer book)
FES 300 Question Bank 2015-02
Page 1 of 17
TAKE NOTE THAT THE “QUESTION GENERATOR” WILL RANDOMLY SELECT SIX
(6) QUESTIONS OUT OF THIS FIFTY TWO (52) TO GENERATE THE RESPECTIVE
QUESTION PAPER.
PLEASE TAKE NOTE THAT “VALUES” AND “FIGURES” IN QUESTIONS MAY
CHANGE FROM TIME TO TIME BUT THE ORIGINAL STRUCTURE OF THE QUESTION WILL REMAIN THE SAME.
------------------------------------------------------------------------------------------------------------------------------------------QUESTIONS
1. (a)
(b)
(c)
(d)
Calculate the labour performed to supply water over a distance of 500 m,
if the pipe used has an internal diameter of 50 mm.
(5)
Calculate the brake power required to drive a pump that will deliver
2400 liters/min of water at a pressure of 600kPa where the efficiency
is 80%.
(6)
A line of 90 mm hose is 500 m long. Water is being discharged at
764 liters/min. Using a frictional factor of 0,01 what is the loss in pressure
due to friction?
(4)
Calculate the maximum output of a hydrant if the static pressure at the
hydrant is 600 kPa and the output measured by the flow rate is
1800 liters/min giving a pressure with water flowing of 450 kPa.
(5)
______________________________________________________________________
2. (a)
Define the following:
(i)
(ii)
Gauge pressure
Absolute pressure
(3)
(4)
(b)
State Pascal’s Law.
(3)
(c)
The plunger piston of a hydraulic press has a diameter of 0,025 m and a
force of 50 N is exerted on it. If the diameter of the ram is 0,1 m, calculate
the force exerted by the ram.
(5)
Calculate the labour performed to supply water at a head height of 20 m,
if the pipe used has an internal diameter of 50 mm.
(5)
(d)
______________________________________________________________________
3. With reference to Pump power and efficiency, define the following:
(i)
(ii)
(iii)
(iv)
(v)
Work
Power
Brake power
Water power
Pump efficiency
(4)
(4)
(4)
(4)
(4)
______________________________________________________________________
4. (a)
A piece of material is able to withstand a pressure of 10 000 kPa before it
will tear. What is the maximum weight on an area of 0,002 m2 that this material
can support?
FES 300 Question Bank 2015-02
(4)
Page 2 of 17
(b)
Calculate the discharge of water through a 15 mm nozzle if the pressure
supplied is 625 kPa.
(4)
What will the approximate pressure loss be for a 30 m x 65 mm lined fire
hose?
(1)
(d)
What will the approximate pressure loss be for a 1 m head (rise)?
(1)
(e)
Indicate by means of calculations that the reaction of the water leaving a
nozzle
increases to four times if the diameter is doubled, by using the
examples of a 20 mm nozzle as compared with a 10 mm nozzle if the
pressure in both cases is 1000 kPa.
(5)
Explain jet reaction at a nozzle.
(5)
(c)
(f)
______________________________________________________________________
5. (a)
Name and explain the different forms of energy a liquid may possess.
(10)
(b)
State Bernoulli’s Principle.
(2)
(c)
State Bernoulli’s theorem.
(4)
(d)
State Bernoulli’s equation in mathematical form.
(3)
(e)
Give the formula for the continuity equation.
(1)
______________________________________________________________________
6. (a)
The definition of pressure states that it is the amount of force exerted by
a fluid perpendicular on a given area; thus : P = F/A
Derive the ‘fire fighters’ formula (P = 10H) for water from the given
equation.
(5)
(b)
List the chief characteristics of pressure.
(5)
(c)
A container has a mass of 5 Mg and a base area of 3 m2. What pressure
does it exert on the floor?
(2)
A gauge registers 60 kPa at the bottom of a tank filled with water. What
is the height of the water in the tank in metres?
(2)
(e)
Calculate the force exerted on a man of 95 kg due to gravity.
(2)
(f)
A container weighing 500 kg is placed on the large piston of a hydraulic
press. The area of the piston is 0,5 m2. If the area of the other piston is
0,005 m2, what force would be sufficient to lift the crate?
(4)
(d)
______________________________________________________________________
7. (a)
(b)
(c)
Calculate the velocity of water issuing from a nozzle when the nozzle
pressure is 450 kPa.
(3)
Calculate the force required to prevent a 10mm diameter nozzle supplied
at a pressure of 450 kPa from recoiling.
(3)
Water flow through an orifice in the vertical side of a tank with a velocity
of 30 m/s. What depth of water is there in the tank above the orifice?
(3)
FES 300 Question Bank 2015-02
Page 3 of 17
(d)
(e)
(f)
The flow rate through a 10 mm nozzle is 150 liters/min. Calculate the
nozzle pressure.
(3)
A U-tube contains a quantity of mercury. Water is poured into one arm of
the tube until the water column is 6,8 m high. Calculate the height of the
mercury in the other arm above the contact surface between the mercury
and the water.
(6)
Calculate the discharge of water through a 10mm nozzle if the pressure
supplied is 400 kPa.
(2)
______________________________________________________________________
8. (a)
Define pressure.
(2)
(b)
Give two units of Pressure.
(2)
(c)
A rectangular dam is 8 m long, 4 m wide and 1,5 m deep. How long will it
take a pump to fill the dam if the pump delivers 1000 liters of water per
minute?
(4)
If 2000 liters/min of water are being delivered through one line of hose
with a loss of pressure due to friction of 600 kPa, the act of twinning
the hose and passing 1000 liters/min through each line will result in the
velocity being halved, but what will the loss in pressure due to friction be
reduced to?
(2)
An enclosed cylinder contains a gas under a pressure of 900 kPa. The
cylinder is connected via tap to a manometer (U-tube) containing mercury.
What will the vertical distance be between the two mercury surfaces in the
manometer when the tap is opened slowly and equilibrium has been
reached?
(5)
Water flows at a speed of 2 m.s-1 in a storm water drain of which the
diameter is 400 mm. What is the discharge through the pipe?
(5)
(d)
(e)
(f)
______________________________________________________________________
9. (a)
(b )
With reference to water flowing through pumps and hoses, explain
kinetic energy and static energy.
(10)
Explain water hamer in detail.
(10)
______________________________________________________________________
10. (a)
(b)
Name and explain the five principal laws governing loss of pressure due
to friction.
(15)
Water flows at a speed of 2m.s-1 in a storm water drain of which the
diameter is 400 mm. What is the discharge through the pipe?
(5)
______________________________________________________________________
11. (a)
Change the subject of the formula to the symbol as shown in brackets:
(i)
...............
(2)
(ii)
.................
(2)
FES 300 Question Bank 2015-02
Page 4 of 17
(b)
(iii)
.......................
(2)
(iv)
................
(2)
(v)
....................
(2)
Simplify the following:
(i)
(2)
(ii)
(2)
(iii)
(2)
(iv)
(2)
(v)
(2)
______________________________________________________________________
12. (a)
(b)
Factorise the following:
(i)
ac + bc
(2)
(ii)
ax – bx + cx
(2)
(iii)
7xy – 7yz – 21yx
(2)
(iv)
15a2 – 25a5 – 35a7
(2)
(v)
4a – 6b
(2)
Simplify the following fractions:
(i)
(2)
(ii)
(2)
(iii)
(2)
(iv)
(2)
FES 300 Question Bank 2015-02
Page 5 of 17
(v)
a0
(2)
______________________________________________________________________
13. (a)
A rectangular skid unit water tank weighs 100 kg when it is empty. The
tank is filled with 1000 litres of water and is 2m long, 1,5 m wide and 1m
high. Answer the following questions:
(i)
Calculate the weight of the water tank when filled with 1000 litres
of water?
(2)
(ii)
Calculated the total water volume capacity of the water tank?
(2)
(iii)
Calculate the pressure the water tank exerts on the skid unit
when it is empty
(2)
Calculate the pressure exerted at the bottom of the skid unit
water tank, filled with 1000 litres of water.
(2)
Calculate the pressure the water tank exerts on the skid unit
when completely filled.
(2)
(iv)
(v)
(b)
The fire station drill yard is 25 m long and 10m wide. Determine how
many foam drums can be packed on the yard next to each other if the
foam drums has a square base with sides of 50 cm.
(2)
Calculate the base of a triangle with an area of 20 m2 and a height of
10 m.
(2)
(d)
Calculate the circumference of a circle with a diameter of 49 cm.
(2)
(e)
Calculate the area of a circle with a circumference of 44 cm.
(2)
(f)
The rectangular tank is 10 m long, 5 m wide and 2 m deep. Calculate the
depth of the water in the tank if it contains 50 m3 of water.
(1 m3 = 1000 litres)
(2)
(c)
______________________________________________________________________
14. (a)
(b)
Explain the difference between the Metric System and the International
System of units.
(4)
Give the Metric unit, SI unit for the following measurements.
(i)
Length
(ii)
Volume
(iii)
Mass
(iv)
Time
(v)
Temperature
(vi)
Pressure
(vii)
Light intensity
(viii) Frequency
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
15. (a)
(b)
A swimming pool is 8 m long and 4m wide and around it a path 2 m wide
is to be tiled. The tiles are squares with 400 mm sides. What will it cost
to tile the area if 5 tiles cost R150.00?
(5)
Calculate the area of a triangle with sides 7 m, 24 m and 25 m long
respectively.
(4)
FES 300 Question Bank 2015-02
Page 6 of 17
The area of a parallelogram is 40,5 cm2 and it’s base is 10 cm. Find it’s
height.
(3)
Calculate the area of triangle with a base of 10m and vertical height of
12 m.
(2)
(e)
Calculate the area of a circle if the circumference is 20 m.
(2)
(f)
A cylindrical water tank is 3 m high and has a diameter of 1,5 m. Calculate
it’s mass if 1 m2 of metal has a mass of 6 kg.
(4)
(c)
(d)
______________________________________________________________________
16. Simplify the following
(a)
a2 x a6 =
(2)
(b)
a2b3 x ab4 =
(3)
(c)
a8 ÷ a4 =
(2)
(d)
a3b2 ÷ a2b =
(3)
(e)
(-3ab)(2a2-4ab-b2) =
(3)
(f)
-12def
(3)
(g)
(x-y)(x+y) =
(3)
(h)
4ab + 2abc =
(1)
-4ef =
______________________________________________________________________
17. Explain by means of diagrams the changes in the velocity and pressure of
water in its passage through a pump form the supply through the nozzle.
This includes single and two stage pumps.
(20)
______________________________________________________________________
18. (a)
(b)
Derive the formula
from the formula Q = v A
(10)
A 25mm nozzle attached to the end of a hose is 150m long, 70mm in
diameter, with a friction factor of 0,005 and the nozzle pressure is
400 kpa. Calculate:
(i)
(ii)
The flow at the nozzle.
The loss of pressure due to friction.
(3)
(7)
______________________________________________________________________
19. (a)
Define the following:
(i)
(ii)
(b)
Temperature.
Specific heat capacity.
(2)
(2)
Calculate the quantity of heat required if 1000 liters of water is to be
heated from 20°C to100°C.
Specific heat capacity of water = 4187 J/kg/ºC
FES 300 Question Bank 2015-02
(3)
Page 7 of 17
(c)
A cast-iron rod 25 m long is heated from 20°C to 200°C. Calculate the
final length of the rod.
The coefficient of linear expansion is 6,28 x 10-6/ºC.
(4)
(d)
Define a moment.
(2)
(e)
Calculate the moment exercised on a nut, when an effort of 60 N is
applied to the end of the spanner at a distance of 300 mm from the nut.
(3)
(f)
Define Newton’s third law.
(2)
(g)
State the law of conservation of energy.
(2)
______________________________________________________________________
20. (a)
(b)
(c)
(d)
(e)
A resistor of 200 ohm is connected to a main supply of 220 volts.
Calculate the current flowing through the resistor?
(4)
What potential difference is required if 2 amperes is to flow through a
resistor of 55 ohms?
(4)
An electric heater uses 10 amperes when it is connected to a 220 volt
supply. Calculate the heater’s resistance?
(4)
Calculate the current which will flow through an electric toaster when it is
connected to a 220 volt supply if the resistance of the toaster is 11ohms?
(4)
Determine the total resistance of three coils having a resistance of 2, 6
and 4 ohms respectively when they are connected in series?
(4)
______________________________________________________________________
21. (a)
State and explain briefly three (3) products of radio-active decay.
(9)
(b)
What is the difference between isotopes of the same element?
(2)
(c)
Give the different isotopes of Hydrogen.
(3)
(d)
The half-life of a radio isotope is four (4) hours. What fraction of the
isotope would have been disintegrated after 12 hours.
(2)
(e)
Given
. Write down the number of protons, number of neutrons,
number of electrons and the mass number.
(4)
______________________________________________________________________
22. Fill in the missing word/s below:
(i)
Electricity is one of the most useful of all forms of ____________
(1)
(ii)
Electricity is closely linked with ___________
(1)
(iii)
When electricity moves, ___________ is created.
(1)
(iv)
Electricity is the movement or flow of the tiny parts of atoms called
_____________
(1)
Electrons move easily through materials called _____________
(1)
(v)
FES 300 Question Bank 2015-02
Page 8 of 17
(vi)
Materials that are poor conductors of electricity are called ___________
(1)
(vii)
Batteries change ___________ energy into electrical energy
(1)
(viii)
Lighting is the sudden release of a giant __________ of static electricity
(1)
(ix)
Energy comes in many different forms, from the __________ energy
locked in sugar.
(1)
(x)
Food is a store of ___________ energy.
(1)
(xi)
Other forms of energy include heat electricity, sound and electromagnetic
__________
(1)
(xii)
__________ energy is created in reactors.
(1)
(xiii)
__________ is the force that acts between two things rubbing together.
(1)
(xiv)
__________ is speed in a particular direction.
(1)
(xv)
______________ is the rate at which an object’s velocity changes.
(1)
(xvi)
The air is a mixture of gases, dust and ___________
(1)
(xvii)
Water is the only substance that can exist as a __________
(1)
(xviii) Things float because they are less ____________ in water.
(1)
(xix)
(xx)
When you float in the water you will sink until your weight is exactly equal
to the ____________ of the water.
(1)
Water is one of the few substances that ___________ as it freezes.
(1)
______________________________________________________________________
23. (a)
(b)
(c)
(d)
Calculate the quantity of heat required if 1000 litres of water are to be
heated from 20ºC to 100ºC
(4)
How much coal will be needed to heat the water in (a) above to the
required temperature if the calorific value of coal is 27MJ/kg?
(4)
A copper bar whose mass is 200kg and whose temperature is 180ºC is
plunged into a container of water whose temperature is 20ºC. How much
water should there be in the container if its final temperature should not
be more than 60ºC? The Specific heat capacity of copper is 0.402kJ/kg,
while that of water is 4.187 kJ/kgºC.
(7)
A cast iron rod 25m long is heated from 20ºC to 200ºC. The coefficient
of linear expansion is 6,28 x 10-6/ºC. Calculate the final length of the rod?
(5)
______________________________________________________________________
24. (a)
Forces are pushes and pulls. State facts and give examples of forces.
(10)
(b)
What makes a car move forward?
(2)
(c)
State Newton’s third law.
(2)
FES 300 Question Bank 2015-02
Page 9 of 17
(d)
Define the following:
(i)
(ii)
(iii)
energy
magnetism
electricity
(2)
(2)
(2)
______________________________________________________________________
25. (a)
(b)
Calculate the work that must be done when an electrical motor with a
mass of 200 kg is pushed a distance of 5 m by a load of 50 N
An electrical lift moves a load of 200 N through a height of 10 m in 0,5
minutes. Calculate:(i)
(ii)
(c)
(2)
work done by the lift
the power generated
(2)
(2)
A current of 0,25 amps flows through a coil of an electromagnetic switch.
The supply voltage is 200 V. Calculate:(i)
(ii)
(iii)
the resistance of the coil
the power flowing through the coil
the work in joules that is supplied to the coil in a period of 1 hour
(2)
(2)
(2)
Calculate the quantity of heat required to heat 20 liters of oil from 4ºC to
80ºC: Specific heat capacity of oil is 2J/ºC.
(2)
(e)
The amount of heat generated depends on three (3) factors, name them.
(3)
(f)
Explain briefly how electric power is generated at large coal power
stations
(3)
(d)
______________________________________________________________________
26. (a)
Define the following:
(i)
(ii)
(b)
moment
motion
(3)
(2)
Calculate the moment exercised on a nut, when an effort of 60 N is
applied to the end of the spanner at a distance of 300 mm from the nut
(3)
(c)
Calculate the effort that would have to be applied to a moment of 650Nm
(3)
(d)
State the following:
(i)
(ii)
(e)
Newton’s first law
Newton’s second law
A car travels at 36 km/h for 5 seconds. Calculate the distance travelled.
(3)
(3)
(3)
______________________________________________________________________
27. (a)
Define the following:
(i)
(ii)
(b)
Kinetic energy
Potential energy
A body whose mass is 50 kg is moving at a velocity of 36 km/h. Calculate
its kinetic energy.
FES 300 Question Bank 2015-02
(3)
(3)
(3)
Page 10 of 17
A body whose mass is 300 kg is supported 20 m above the earth’s surface.
Calculate its potential energy.
(3)
(d)
State the law of conservation of energy and give two examples.
(5)
(e)
A ball is projected upwards at 25 m/s. Calculate the maximum height it
will reach.
(3)
(c)
______________________________________________________________________
28. Give the names for the following definitions
(i)
The lowest temperature possible
(1)
(ii)
A change in velocity
(1)
(iii)
The relative position, measured in degrees, between two lines
that meet or intersect
(1)
A flat geometric shape in which every point around the edge
is the same distance from the center
(1)
(v)
A pathway around which electricity flows
(1)
(vi)
The distance around the edge of a circle
(1)
(vii)
A material through which heat or electricity can flow
(1)
(viii)
The unit used to measure the loudness of sounds
(1)
(ix)
Any line across a circle that passes through the centre
(1)
(x)
Energy involving the flow of electrons through substances
(1)
(xi)
Energy that travels as waves through space and matter
(1)
(xii)
The force that acts between two objects rubbing together
(1)
(xiii)
The internal energy stored in an object or substance
(1)
(xiv)
A simple machine that uses turning force to reduce the effort
needed to move objects
(1)
(xv)
The distance between the edge of a circle and the centre
(1)
(xvi)
The relative position of two lines that meet or intersect at 90º
(1)
(xvii)
A solid geometric shape in which every point on the surface
is the same distance from the centre
(1)
A flat geometric shape with four straight sides of equal length
and four right angles
(1)
(xix)
A measurement of an objects internal energy
(1)
(xx)
A flat geometric shape that has three straight sides
(1)
(iv)
(xviii)
______________________________________________________________________
FES 300 Question Bank 2015-02
Page 11 of 17
29. (a)
Define the following
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(b)
Force
Distance
Speed
Velocity
Acceleration
Power
A body moving at 96 km/h is brought to a stop over a distance of 150 m
by a uniform deceleration. Determine the value of that deceleration and
the time taken to bring the body to a stop.
(2)
(2)
(3)
(3)
(3)
(2)
(5)
______________________________________________________________________
30. (a)
Calculate the velocity of a stone 7 seconds after falling from rest of the
edge of a high cliff?
(2)
A body falls from a position of rest at the top of a tall building and
attains a velocity of 63,7 m/s just before striking the ground. Calculate
the time for the body to fall from the top of the building to the ground?
(2)
(c)
Calculate the distance a body falls in 4 seconds if it was initially at rest.
(2)
(d)
A body falling from rest, has a velocity of 25 m/s at a given instant.
Calculate:
(b)
(i)
(ii)
(e)
The distance the body has fallen.
The time taken.
(2)
(2)
Calculate the moment exercised on a nut when an effort of 60N is
applied to the end of the spanner at a distance of 300mm from the nut.
(2)
(f)
Convert 100 km/h to m/s
(2)
(g)
A vehicle travels at 100 km/h for 10 seconds. Calculate the distance
travelled.
(2)
(h)
Calculate the weight of a mass of 200 kg
(1)
(I)
A ball is projected upwards at 25 m/s. Calculate the maximum height
it will reach.
(3)
______________________________________________________________________
31. (a)
When is a substance radioactive?
(2)
(b)
Name three (3) types of radiation.
(3)
(c)
Give the Greek letters that are used to describe the different types of
radiation.
(3)
(d)
State the range of the different radioactive particles.
(3)
(e)
Name three (3) uses of radiation.
(3)
(f)
Explain radioactive decay.
(3)
(g)
List three (3) dangers of radiation.
(3)
______________________________________________________________________
FES 300 Question Bank 2015-02
Page 12 of 17
32. (a)
(b)
(c)
(d)
(e)
A resister of 200 ohm is connected to a main supply of 220 volts.
Calculate the current flowing through the resistor?
(4)
What potential difference is required if 2 amperes is to flow through a
resistor of 55 ohms?
(4)
An electric heater uses 10 amperes when it is connected to a 220 volt
supply. Calculate the heater’s resistance?
(4)
Calculate the current which will flow through an electric toaster when it is
connected to a 220 volt supply if the resistance of the toaster is 11
ohms?
(4)
Determine the total resistance of three coils having a resistance of 2,6
and 4 ohms respectively when they are connected in series?
(4)
______________________________________________________________________
33. Discuss Electricity and magnetism in detail.
(20)
______________________________________________________________________
34. Discuss air and water as the most important substances in the world.
(20)
______________________________________________________________________
35. Discuss the following:
(i)
(ii)
Energy
Force and motion
(10)
(10)
______________________________________________________________________
36. Balance the following chemical equations:
(i)
HgO → Hg + O2
(2)
(ii)
C10H16 + Cl2 → C + HCl
(2)
(iii)
C7H6O2 + O2 → CO2 + H2O
(2)
(iv)
K + Br2 → KBr
(2)
(v)
C7H16 + O2 → CO2 + H2O
(2)
(vi)
KClO3 → KClO4 + KCl
(2)
(vii)
C3H8 + O2
(viii)
H2S + Cl2 → S8 + HCl
(2)
(ix)
N2 + O2 → N2O
(2)
(x)
H3PO4 → H4P2O7
→ CO2 + H2O
+ H2O
(2)
(2)
______________________________________________________________________
FES 300 Question Bank 2015-02
Page 13 of 17
37. (a)
(b)
Carbon is a very special element. State at least ten facts of carbon.
(10)
Give chemical names for the following everyday items.
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
Baking powder
Bleach
Caustic soda
Dry ice
Laughing gas
Rust
Salt
Sand
Vinegar
Vitamin C
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
______________________________________________________________________
38. (a)
Name the following substances:
(i)
(ii)
(iii)
(iv)
(v)
(b)
Na2SO4
KCl
CaCl2
SO3
CS2
(2)
(2)
(2)
(2)
(2)
Give the formulae of the following compounds:
(i)
(ii)
(iii)
(iv)
(v)
Sodium oxide
Potassium iodide
Sulphuric acid
Hydrochloric acid
Nitric acid
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
39. Complete the following table by listing the missing information from a to t:
Name
Hydrogen
Helium
(e)
(g)
Boron
Sodium
(m)
(o)
(q)
Phosphorus
Symbol
(a)
(c)
Li
Be
(i)
(k)
Mg
Al
Si
(s)
Atomic Number
1
(d)
3
(h)
5
(l)
12
(p)
14
(t)
Atomic Mass
(b)
4
(f)
9
(j)
23
(n)
27
(r)
31
20 x 1 = (20)
______________________________________________________________________
40. (a)
(b)
Calculate the percentage composition of sulphuric acid, if the atomic
masses are H = 1u, S = 32u, and O = 16u.
(5)
A compound contains 74, 27% C; 7,79% H; 12,99% N. Determine the
empirical formula. C = 12; H = 1; N = 14; O = 16.
(10)
FES 300 Question Bank 2015-02
Page 14 of 17
(c)
Define the following;
(i)
(ii)
A Mole
Avogrado’s Number
(3)
(2)
______________________________________________________________________
41. Discuss in detail the states of matter.
(20)
______________________________________________________________________
42. Define the following :
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
Atomic number
Mass number
An element
An isotope
Nuclear reactions
Radio-activity
Half-life
Molecule
Molecular mass
Oxidation & reduction
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
43. (a)
(b)
Give names for the following compounds:(i)
HNO3
(ii)
H2SO4
(iii)
NH3
(iv)
Ca O
(v)
Cu O
(2)
(2)
(2)
(2)
(2)
Give the names for the following radicals:(i)
OH
(ii)
SO4
(iii)
HCO3
(iv)
PO4
(v)
CO3
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
44. (a)
Define, state or explain the following :
(i)
(ii)
(iii)
(iv)
(v)
(b)
Emperical formula
Beta rays
Molar gas volume
Chemistry
Hard water
Briefly state the methods of softening hard water.
(2)
(2)
(2)
(2)
(2)
(10)
______________________________________________________________________
45. (a)
Express 0,5 mole of calcium atoms in terms of grams of calcium.
(3)
(b)
How many calcium atoms are in 120g calcium?
(3)
(c)
How many atoms are in 12g magnesium?
(4)
FES 300 Question Bank 2015-02
Page 15 of 17
(d)
1 Mole N2 combines to with 1 mole of O2 according to the following
equation :
N2 + O2 → 2NO
How many :
(i)
(ii)
(iii)
(iv)
(v)
Atoms are there in each molecule O2.
Atoms are there in each molecule N2.
Mole oxygen will combine with 2 moles nitrogen.
Mole NO will be formed when 3 moles N2 react with excess O2.
Mole oxygen atoms are in 3 moles O2.
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
46. Balance the following chemical equations:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
H2 + O2 → H2O
S8 + O2 → SO3
HgO → Hg + O2
Zn + HCl → ZnCl2 + H2
Na + H2O → NaOH + H2
C10H16 + Cl2 → C + HCl
Si2H3 + O2 → SiO2 + H2O
Fe + O2 → Fe2O3
C7H6O2 + O2 → CO2 + H2O
FeS2 + O2 → Fe2O3 + SO2
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
47. Give the name, symbol, atomic number and valency of the first twenty
elements on the periodic table.
(20)
______________________________________________________________________
48. Give the following information for four different gases on the periodic table:
(i)
Name
(ii)
Symbol
(iii)
Atomic number
(iv)
Valency
(v)
Atomic mass
(4)
(4)
(4)
(4)
(4)
______________________________________________________________________
49. (a)
How many grams of sodium are there in 0,5 mole of sodium?
(2)
(b)
How many mole sodium atoms are in 69g of sodium?
(2)
(c)
Calculate the number of atoms in 23g sodium.
(2)
(d)
What is the atomic number and atomic mass of sodium?
(2)
(e)
Calculate the percentage composition of H2SO4
(4)
(f)
Give names for the following compounds:(i)
HNO3
(ii) HCI
(iii) H2SO4
(iv) H2CO3
(v) NH3
(vi) K2O
(1)
(1)
(1)
(1)
(1)
(1)
FES 300 Question Bank 2015-02
Page 16 of 17
(vii) Ca O
(viii) CO2
(1)
(1)
______________________________________________________________________
50. Discuss used of radioactive isotopes in the following:
(i)
(ii)
(iii)
Medical Science
Industry
Agriculture
(4)
(8)
(8)
______________________________________________________________________
51. With reference to organic chemistry define or explain the following:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
Organic chemistry
Saturated hydrocarbons
Unsaturated hydrocarbons
The empirical formula
The molecular formula
The structural formula
Alkanes
Alkenes
Alkynes
Isomerism
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
52. (a)
(b)
Give the names/ empirical formulae and structural formulae of four
alkanes.
With reference to alkanes. List the following:
(i)
(ii)
(iii)
(c)
(12)
Physical properties
Chemical properties
Industrial importance
(2)
(2)
(2)
State the general formula for alkanes
(2)
______________________________________________________________________
FES 300 Question Bank 2015-02
Page 17 of 17
SOUTHERN AFRICAN EMERGENCY SERVICES INSTITUTE.
QUESTIONS FOR:
1.
REQUIRED STUDY MATERIAL:


2.
Success Study Material – Fire Engineering Science 400 Book 1/2
Success Study Material – Fire Engineering Science 400 Book 2/2
ADDITIONAL STUDY MATERIAL



3.
DIPLOMA - FIRE ENGINEERING SCIENCE 400 (FES400)
Success Study Material – Fire Engineering Science 300 Book 1/3
Success Study Material – Fire Engineering Science 300 Book 2/3
Success Study Material – Fire Engineering Science 300 Book 3/3
QUESTIONS

Questions MUST be read carefully to ensure clear understanding of the concept and/or
content and apply them as such in your answers, for example:





Describe:
Define:
Discuss:
Give:
List:



Name:
Draw:
Explain:
Name the characteristics of something (a happening, object, method or subject).
Give a concise description of the subject.
Give a complete description of the subject.
Write down names, facts, items, advantages and/or disadvantages. Do not discuss.
Write down names, facts, items, etc. In a specific order or according to specified categories.
Write down names, characteristics, dates, items, components or facts.
Dot out, draw lines, sketch or formulate in graphic form (e.g. a drawing).
Make something more clearly for example by using illustrations, descriptions, examples and/or comparisons.
4.
Study material and revision questions contained in the Success Manuals and SABS Codes of
Practice (Relevant edition) is of vital importance, as it contributes to 100% of the questions.
5.
Question paper is a three (3) hour paper and consisting of Six (6) and ALL of them must be
answered.
6.
All questions add to a total of twenty (20) marks per question with a total of hundred and twenty
marks (120) marks for the whole paper.
7.
Students are advised to attempt all assignments and questions in the study material to obtain more
knowledge on the subject.
8.
Please indicate on the front cover of your answer book the questions answered. Ensure that you
have answered the correct number of questions. If there is questions that must not be marked,
please put a line through such answer.
9.
There is no required length or limit for your answers, unless it is stated so e.g. “an acceptable
format”. Questions can be sufficiently answered in less space, and it is okay to go over, if you think
it improves the response. Keep in mind, however, that a lengthier answer is not necessarily a better
one.
10.
You have an average of thirty (30) minutes for each question. Though grammar and style will not
be a major factor in your grade, there should be a reasonable degree of organization and clarity. It
is advisable to spend a few minutes planning your response, possibly even jotting down a very
simple outline, rather than simply writing off the top of your head. (You may write notes on your
answer book)
FES 400 Question Bank 2015-02
Page 1 of 11
TAKE NOTE THAT THE “QUESTION GENERATOR” WILL RANDOMLY SELECT SIX
(6) QUESTIONS OUT OF THIS THIRTY FIVE (35) TO GENERATE THE RESPECTIVE
QUESTION PAPER.
PLEASE TAKE NOTE THAT “VALUES” AND “FIGURES” IN QUESTIONS MAY
CHANGE FROM TIME TO TIME BUT THE ORIGINAL STRUCTURE OF THE QUESTION WILL REMAIN THE SAME.
------------------------------------------------------------------------------------------------------------------------------------------QUESTIONS
1. (a)
(b)
(c)
(d)
A Bourdon gauge connected to a fire hose close to the nozzle indicates
that the pump is delivering water at a pressure of 600 kPa to the nozzle.
From the quantity of water discharged, it is calculated that the velocity
of the water in the fire hose is 2 m.s-1.
With what velocity is the water discharged from the nozzle?
(6)
The pressure head at a fire hydrant is 30 m of water. What is the expected
velocity with which the water will be discharged when the hydrant is opened
assuming that the pressure in the hydrant decreases to 10 m of water when
the hydrant is fully open.
(3)
The pressure at a hydrant is 30 kPa when the hydrant is closed and 22 kPa
when the hydrant is open. With what velocity is the water discharged from
the hydrant?
(3)
A nozzle is held in a horizontal position, 2 m above the surface of water in a
dam. The water discharged by the nozzle strikes the surface of the dam
30 m from the nozzle.
With what velocity does the water leave the nozzle? (Neglect frictional losses)
(e)
(5)
A piezometer and a Pitot tube are installed close to one another in the same
pipe. The water in the pipe is under a pressure of 14 kPa and is flowing with
a velocity of 4 m.s-1.
What are the readings on the piezometer and the Pitot tube?
(3)
______________________________________________________________________
2. (a)
(b)
State the forms of energy which a liquid in motion can possess.
(6)
What is meant by:(i)
(ii)
(iii)
(iv)
potential head
pressure head
velocity head
total head for a liquid in motion
(1)
(1)
(1)
(1)
(c)
State Bernoulli’s theorem for a liquid.
(3)
(d)
A jet of water from a 25 mm diameter nozzle is directed vertically upwards.
Assuming that the jet remains circular and neglecting any loss of energy,
what will be the diameter of the jet at a point 4,5 m above the nozzle if the
velocity with which the jet leaves the nozzle is 12 m/s.
(7)
______________________________________________________________________
FES 400 Question Bank 2015-02
Page 2 of 11
3. Explain in detail all aspects of Bernoulli’s Principle.
(20)
______________________________________________________________________
4. A fire engine is equipped with a 300 m length of hose with an internal diameter of
65 mm for which the friction coefficient is 0,005. This fire hose supplies a nozzle
with internal diameter of 15 mm. The nozzle is located on top of a roof 10 m above
the level of the outlet of the pump and the flow rate is 500 liters.min-1.
Calculate:
(i)
the nozzle pressure (i.e. pressure in the fire hose just before the
nozzle entrance)
(3)
(ii)
the effective height of the fire stream measured from the level of the
pump outlet
(3)
(iii)
the velocity with which the water leaves the nozzle
(2)
(iv)
the force that must be exerted to prevent the nozzle from recoiling
from the jet
(3)
(v)
the velocity with which the water flows in the hose
(2)
(vi)
the pressure loss in the hose as a result of friction
(3)
(vii)
the pressure needed at the pump exit to maintain this fire stream
(3)
(viii)
the pressure of the water just outside the nozzle
(1)
______________________________________________________________________
5. (a)
(b)
Derive the fire fighters formula for Nozzle discharge (L) in liters per minute
from the formula for quantity of water (Q) in cubic meters per second.
(10)
The flow rate through a 12 mm nozzle connected to a 65 mm fire-hose is
600 liters/min.
(i)
Use Bernoulli’s equation to find the pressure at the nozzle.
(5)
(ii)
Use the fire fighters formula to calculate the nozzle pressure.
(3)
(iii)
Find the percentage difference between the accurate answer
obtained in (i) and the approximation in (ii).
(2)
______________________________________________________________________
6. A pipe with an internal diameter of 150 mm delivers water at a rate of 7500 liters.min-1
under a pressure of 820 kPa. This pipe is connected to a main line of diameter
300 mm at a height of 3m above the smaller supply line by means of a coupling
whose diameter changes gradually from 150 mm to 300 mm.
What is the pressure in the main line if friction losses are negligible?
(20)
______________________________________________________________________
7. A fire engine stands on a slight rise, 30 m above the point where the water leaves
the nozzle. To convey the water from the fire engine to the nozzle, 5 lengths of fire
hose, each 100 m long and with an internal diameter of 70 mm, are used. The friction
coefficient for the hose is 0,005 and the factor k for each of the 6 couplings is 0,2.
FES 400 Question Bank 2015-02
Page 3 of 11
There are two sharp bends (k = 1,5) and 3 slight bends (k = 0,4) in the whole length of
the hose. The flow rate through the system is 750 liters.min .
Calculate:
(i)
The pressure head loss in the whole length of the hose as a result of friction
(5)
(ii)
The pressure head loss due to shock losses
(5)
(iii)
The pressure required at a 15 mm internal diameter nozzle to maintain this
flow rate
(4)
The pressure at the pump outlet of the fire engine.
(6)
(iv)
______________________________________________________________________
8. State Newton’s Third Law and explain in your own words with examples where this
law is applicable in the Fire Service and in other Physical activities?
(20)
______________________________________________________________________
9. (a)
There is an orifice with a diameter of 50 mm in the vertical side of a tank,
at a depth of 4,5 m below the surface of the water in the tank. Water flows
out of the orifice at a rate of 692 liters/min,
(i)
find the value of the discharge coefficient
(6)
(iii)
if the coefficient of velocity, Cv, has a value of 0,95 what is the value
of the coefficient of contraction, Cv
(2)
what is the diameter of the jet at the vena contracta
(4)
(iii)
(b)
The fire fighting jet delivered by a 50 mm nozzle has a diameter of 45 mm
at the vena contracta. The nozzle discharges 3 360 liters/min when
the pressure in the fire hose at the nozzle is 636 kPa.
Find the value of the three coefficients.
(8)
______________________________________________________________________
10. (a)
The ram suction of a single – acting hydraulic press has a diameter
of 100 mm, and the plunge suction has a diameter of 20 mm and stroke
length of 40 mm. The lifting advantage of the plunge suction is 20.
Calculate:
(i)
the force that must be applied to the handle to lift a weight of 1,5 Mg
if the efficiency is 80%;
(8)
the number of strokes which must be exerted by the plunge suction
to lift the weight of 100 mm.
(4)
Calculate the work done per delivery stroke of a single-acting piston pump
with a piston diameter of 80 mm and a stroke of 120 mm. During the
delivery stroke, the pressure gauge indicates a pressure of 200 kPa in the
delivery pipe.
(8)
(ii)
(b)
______________________________________________________________________
FES 400 Question Bank 2015-02
Page 4 of 11
11. (a)
Water flows out of an orifice in the vertical side of a tank with a velocity
of 3 m/s. Calculate the depth of the water above the orifice.
(2)
(b)
Explain water hammer in detail.
(7)
(c)
A pump must be able to provide 6 000 liters of water per minute through
a 50 mm diameter nozzle. Calculate the pressure required.
(4)
A tank can hold sufficient water to supply one 40 mm outlet diameter nozzle
at a pressure of 500 kPa for 30 minutes. If the tank is initially two thirds full,
calculate the time it would be able to supply the combined demand of two
nozzles, one of which has a flow rate of 1 000 liters/min, whilst the other
with a diameter of 20 m is supplied at a pressure of 400 kPa.
(7)
(d)
______________________________________________________________________
12. (a)
Water is discharged through a hole in a tank situated on top of a building.
The hole is 125 m above ground level and the water issues from the hole
with a horizontal velocity of 12 m/s.
(i)
(ii)
(ii)
(b)
(c)
How long does it take a specific drop of water to fall to ground
level?
(4)
What is the downward velocity of the drop of water when it
reaches the ground?
(3)
How far does the drop of water travel in a horizontal direction
during its time of fall, if its horizontal velocity is 12 m/s?
(4)
A body falling from rest, has a downward velocity of 25 m/s at a given
instant. How far has the body fallen, and how long did it take?
(6)
How high is a bridge above the water if a stone falling from rest from
the bridge takes 6 seconds to reach the water?
(3)
______________________________________________________________________
13. (a)
(b)
Calculate the labour performed to supply water at a head height of 30 m,
f the pipe used has an internal diameter of 65 mm.
The nozzle of a fire hose produces a 20 mm diameter jet of water.
If the discharge is 85 dm3/s, calculate:
(i)
(ii)
(iii)
(iv)
(c)
(4)
the reaction of the jet
the theoretical distance that the water will reach
the practical distance that the water will reach
the effective distance of the water jet
Derive the fire fighters formula for jet reaction
(3)
(2)
(3)
(3)
(5)
______________________________________________________________________
14. (a)
(b)
Five 70 mm fire hoses, delivering equal quantities of water, fill a
100 000 liter tank in 40 minutes. Calculate the velocity of the water
in one of these hoses.
(5)
The cross-section of a closed canal is an equilateral triangle of which
the circumference is 660 mm. Water flows in the canal with a velocity of
5 m.s-1. What diameter must a cylindrical pipe have to carry the same
quantity of water at a velocity of 3 m.s-1
(5)
FES 400 Question Bank 2015-02
Page 5 of 11
(c)
(d)
A pump must be able to provide 6 000 litres of water per minute through
a 50 mm diameter nozzle. What pressure must be developed at the
nozzle by the pump.
(4)
A water duct of square cross-section and internal dimensions of 50 mm
by 50 mm is full of water flowing with a velocity of 5 m.s-1. This quantity
of water is just sufficient to supply a pump feeding a 25mm (internal outlet
diameter) nozzle. At what pressure is the pump delivering the water at
the nozzle.
(6)
______________________________________________________________________
15. (a)
(b)
A cylindrical overhead reservoir containing water to a depth of 3 m is
able to provide a continuous gravity feed to 20 sprinkler heads, each
with an internal diameter of 15 mm, at a pressure of 200 kPa for 30
minutes. The sprinkler heads are all at the same horizontal level. What
is the diameter of the reservoir and also the minimum height of the
reservoir floor above the level of the sprinkler heads.
(10)
A tank can hold sufficient water to supply one 40 mm (outlet diameter)
nozzle at a pressure of 500 kPa for 30 minutes. If the tank is initially
two-thirds full, how long would it be to supply the combined demand of
two nozzles, one of which has a flowrate of 1000 l.min-1, whilst the other
one with a diameter of 20 mm is supplied at a pressure of 400 kPa.
(10)
______________________________________________________________________
16. (a)
(b)
Water flows with a velocity of 6 m.s-1 in a pipe with a square cross-section
of 50 mm by 50 mm. The water flows into a dam, from which it is
withdrawn by a pump supplying a 25 mm nozzle. The inflow into the dam
is just sufficient to feed the pump. At what pressure does the pump deliver
the water to the nozzle.
(7)
A rectangular tank with internal dimensions of 2 m by 3 m receives water
from a 100 mm pipe. The tank feeds two nozzles with internal diameter
of 20 mm and 30mm respectively. The nozzle pressure is 700 kPa and
both cases.
(i)
(ii)
Find the velocity of the water in the 100 mm pipe if the water level
in the tank remains constant when only the 30 mm nozzle is in
operation.
(6)
Find the drop in water level in the tank after one hour of
simultaneous operation of the two nozzles.
(7)
______________________________________________________________________
17. (a)
(b)
Calculate the temperature at atmospheric pressure when a ¼ mole
of methane gas will occupy a volume of 2,8dm3.
(5)
Explain the following:
(i)
(ii)
(iii)
A saturated solution.
A supersaturated solution.
Explain why substances dissolve.
(2)
(3)
(10)
______________________________________________________________________
FES 400 Question Bank 2015-02
Page 6 of 11
18. (a)
A copper bar with a mass of 200kg and a temperature of 180ºC is
plunged into a container of water with a temperature of 20ºC. How
much water should there be in the container if its final temperature
should not be more than 60ºC?
The specific heat capacity of copper is 0,402kJ/kg, while that of
water is 4,187kJ/kg.ºC.
(b)
(10)
A primary cell with an emf of 1,5volt and an internal resistance of
0,20 ohm is connected in circuit with a resistor of 4 ohms.
Calculate:
(i)
(ii)
(iii)
The current flow in the external resistor
The potential difference at the poles when the current is delivered
The voltage drop due to the cell’s resistance
(4)
(3)
(3)
______________________________________________________________________
19. (a)
(b)
A body with a mass of 50kg is moving at a velocity of 36km/h. Calculate
its kinetic energy?
A body with a mass of 300 kg is supported 20m above the earth’s surface.
(i)
(ii)
(c)
(d)
(4)
Calculate its potential energy
If the body is allowed to fall, what will its velocity be just before
it comes to rest?
(4)
(4)
A ball is projected upwards at 25ms-1. Calculate the maximum height it
will reach?
(4)
Explain conservation of energy.
(4)
______________________________________________________________________
20. (a)
Name and explain the types and range of radioactive particles.
12)
(b)
Explain radioactive decay and give an example.
(5)
(c)
Explain carbon dating.
(3)
______________________________________________________________________
21. (a)
(b)
(c)
(d)
(e)
A cast iron rod 25m long is heated from 20 C to 200 C. The coefficient
of linear expansion is 6,28 x 10-6/ C. Calculate the final length of the rod.
(3)
A resistor of 200 Ohm is connected to a main supply of 220volts.
Calculate the current flowing through the resistor.
(3)
What potential difference is required if 2 amperes is to flow though a
resistor of 55 ohms?
(3)
An electricity heater uses 10 amperes when it is connected to a
220volt supply. Calculate the heater’s resistance.
(3)
Eight (8) cells each having an emf of 1,5volts and internal resistance of
0,2 ohm are connected in series.
(i)
FES 400 Question Bank 2015-02
What current will be passed through a lamp connected across
the terminals if the resistance of the lamp is 4,4 ohms?
(4)
Page 7 of 11
(ii)
Calculate the potential difference of the battery if the lamp burns.
(4)
______________________________________________________________________
22. (a)
The sum of two numbers is 28, while their difference is 12. Determine the
two numbers in question.
(4)
A certain number is 5 more than three times another number. The product
of the two numbers is 68. Find the numbers.
(4)
Find the dimensions of a rectangle of which the area is 150m2 and the
perimeter 50m.
(4)
(d)
Draw the graph of
(4)
(e)
Draw the graph of
(4)
(b)
(c)
______________________________________________________________________
23. State Newton’s Third Law and explain in your own words with examples where
this law is applicable in the Fire Service and in other Physical activities?
(20)
______________________________________________________________________
24. (a)
A rectangular swimming pool is 10 m long and 3 m wide. If the area is to
be doubled by increasing the length and the width by the same amount.
Calculate the new dimensions.
(b)
(5)
Express the following expression without negative exponents and simplify:
(5)
(c)
(d)
A tank on top of a roof can be filled in 75 minutes and emptied in 105
minutes. If the tank is empty to start with, and the inlet and outlet taps
are opened simultaneously, how long will it take to fill the tank?
(5)
Two inlet pipes can, individually, fill a tank in 12 minutes and 20 minutes
respectively. An outlet pipe can drain the tank in 30 minutes. If the tank is
empty at the start and all three pipes are used simultaneously, how long
will it take to fill the tank?
(5)
______________________________________________________________________
25. (a)
(b)
What is the volume of 24g oxygen gas at STP?
(Molar volume = 2,2 x 10-2m3 mole-1. Atomic mass of oxygen =16ų)
Calculate the mass of calcium carbonate (in Kg) required to liberate
0,11Kg carbon dioxide when burning. The equation of the reaction
is the following :
CaCO3 → CaO + CO2
(c)
(4)
Calculate the empirical formula when 30,4g nitrogen combines with
69,6g oxygen.
FES 400 Question Bank 2015-02
(5)
(6)
Page 8 of 11
(d)
Calculate the volume of oxygen required to react to completion with
20dm3 sulphur dioxide in the following reaction :
2SO2 + O2 → 2SO3
(5)
______________________________________________________________________
26. List and explain the particle structure of matter.
(20)
______________________________________________________________________
27. (a)
Give the name and formula of four (4) alkanes.
(8)
(b)
What is the general formula of alkanes?
(2)
(c)
State the physical properties of alkanes.
(3)
(d)
State the chemical properties of alkanes.
(2)
(e)
State the industrial importance of alkanes.
(2)
(f)
What are alkanes?
(3)
______________________________________________________________________
28. (a)
(b)
With reference to the chemical properties of alkali metals explain the
reactions with four (4) different substances and give formulae of
these reactions
(12)
State the distinctive properties of alcohol
(8)
______________________________________________________________________
29. (a)
Give the structural formula for the following:
(i)
(ii)
(iii)
(iv)
(v)
(b)
(c)
Explain Esters in detail and give at least one example of a structural
formula how esters are formed.
(1)
(1)
(1)
(1)
(1)
(10)
Identify the functional group in each of the following compounds:
(i)
(ii)
(iii)
(d)
ethanol
formic acid
acetic acid
chloroform
ethyne
alcohols
carboxylic acids
esters
Give the name and structural formula of the acid formed by the oxidation
of butanol.
(1)
(1)
(1)
(2)
______________________________________________________________________
30. (a)
(b)
How many sodium atoms are in 57,5g of sodium.
(Atomic mass of Na = 23 u).
(2)
Give the common names for the following:
(i)
(ii)
FES 400 Question Bank 2015-02
Potassium Hydroxide
Sodium Hydroxide
(1)
(1)
Page 9 of 11
(c)
(d)
Balance the following reaction by means of the half-reaction method:
Zn + Ag+ (aq) → Zn2+ + (aq) + Ag
(6)
List and explain the factors that affect the rate of solution.
(10)
______________________________________________________________________
31. (a)
(b)
Explain organic chemistry in detail.
Explain the following:
(i)
(ii)
(c)
(10)
Carboxylic Acid
Esters
Express 0,5 mole of sodium atoms in terms of grams of sodium.
(4)
(4)
(2)
______________________________________________________________________
32. (a)
Explain the following:
(i)
(ii)
(b)
A saturated solution
A supersaturated solution
(2)
(3)
List and explain:
(i)
(ii)
Three (3) types of liquids
Properties of liquids
(6)
(9)
______________________________________________________________________
33. (a)
Give the definitions for the following:
(i)
(ii)
(iii)
(iv)
(v)
(b)
Atomic number
Mass number
An element
Isobars
Atomic Mass
(2)
(2)
(2)
(2)
(2)
Explain the usage of radioactive isotopes under the following headings:
(i)
(ii)
Industry
Agriculture
(6)
(4)
______________________________________________________________________
34. (a)
Name five (5) uses for each of the following :
(i)
(ii)
(b)
Chlorine.
Hydrogen Chloride.
(5)
(5)
Give balanced chemical equations for the following reactions :
(i)
(ii)
(iii)
Heated sodium burns vividly in Cl2 gas.
Reaction of chlorine with water.
Hydrochloric acid reduces manganese dioxide (MnO2) to water
and chloride.
(3)
(3)
(4)
______________________________________________________________________
FES 400 Question Bank 2015-02
Page 10 of 11
35. (a)
What similarities are there between ordinary combustion and breathing?
(2)
(b)
Write down in your own words what is meant by combustion?
(3)
(c)
What products are formed when a substance burns in oxygen?
(2)
(d)
Write down balanced equations for three different substances with
oxygen and their end-products?
(9)
(e)
Define an exothermic and endothermic reaction.
(2)
(f)
Define fire.
(2)
______________________________________________________________________
FES 400 Question Bank 2015-02
Page 11 of 11
SOUTHERN AFRICAN EMERGENCY SERVICES INSTITUTE.
QUESTIONS FOR:
1.
REQUIRED STUDY MATERIAL:


2.
Success Study Material – Fire Engineering Science 400 Book 1/2
Success Study Material – Fire Engineering Science 400 Book 2/2
ADDITIONAL STUDY MATERIAL



3.
HIGHER DIPLOMA - FIRE ENGINEERING SCIENCE 500 (FES500)
Success Study Material – Fire Engineering Science 300 Book 1/3
Success Study Material – Fire Engineering Science 300 Book 2/3
Success Study Material – Fire Engineering Science 300 Book 3/3
QUESTIONS

Questions MUST be read carefully to ensure clear understanding of the concept and/or
content and apply them as such in your answers, for example:





Describe:
Define:
Discuss:
Give:
List:



Name:
Draw:
Explain:
Name the characteristics of something (a happening, object, method or subject).
Give a concise description of the subject.
Give a complete description of the subject.
Write down names, facts, items, advantages and/or disadvantages. Do not discuss.
Write down names, facts, items, etc. In a specific order or according to specified categories.
Write down names, characteristics, dates, items, components or facts.
Dot out, draw lines, sketch or formulate in graphic form (e.g. a drawing).
Make something more clearly for example by using illustrations, descriptions, examples and/or comparisons.
4.
Study material and revision questions contained in the Success Manuals and SABS Codes of
Practice (Relevant edition) is of vital importance, as it contributes to 100% of the questions.
5.
Question paper is a three (3) hour paper and consisting of Six (6) and ALL of them must be
answered.
6.
All questions add to a total of twenty (20) marks per question with a total of hundred and twenty
marks (120) marks for the whole paper.
7.
Students are advised to attempt all assignments and questions in the study material to obtain more
knowledge on the subject.
8.
Please indicate on the front cover of your answer book the questions answered. Ensure that you
have answered the correct number of questions. If there is questions that must not be marked,
please put a line through such answer.
9.
There is no required length or limit for your answers, unless it is stated so e.g. “an acceptable
format”. Questions can be sufficiently answered in less space, and it is okay to go over, if you think
it improves the response. Keep in mind, however, that a lengthier answer is not necessarily a better
one.
10.
You have an average of thirty (30) minutes for each question. Though grammar and style will not
be a major factor in your grade, there should be a reasonable degree of organization and clarity. It
is advisable to spend a few minutes planning your response, possibly even jotting down a very
simple outline, rather than simply writing off the top of your head. (You may write notes on your
answer book)
FES 500 Question Bank 2015-02
Page 1 of 10
TAKE NOTE THAT THE “QUESTION GENERATOR” WILL RANDOMLY SELECT SIX
(6) QUESTIONS OUT OF THIS THIRTY THREE (33) TO GENERATE THE RESPECTIVE QUESTION PAPER.
PLEASE TAKE NOTE THAT “VALUES” AND “FIGURES” IN QUESTIONS MAY
CHANGE FROM TIME TO TIME BUT THE ORIGINAL STRUCTURE OF THE QUESTION WILL REMAIN THE SAME.
------------------------------------------------------------------------------------------------------------------------------------------QUESTIONS
1. (a)
A tank has a floor area of 20 m2 and vertical sides 10 m high. There is
a circular orifice of 100 mm diameter in the sides of the tank, 8m above
the floor. If the tank is initially full of water, calculate:
(i)
(ii)
(iii)
(b)
The theoretical horizontal velocity with which the water will initially
be discharged through the orifice.
(2)
The horizontal distance from the base of the tank to the point
where this jet of water will strike the ground.
(6)
The time taken for the water level in the tank to drop to the level
of the orifice, assuming that the discharge coefficient of the orifice
is 0,65.
(5)
A rectangular tank of which the base measures 2 m by 3 m is filled with
water to a depth of 4 m. In the base of the tank there is an orifice with
a diameter of 200 mm. The coefficient of velocity for flow through the
orifice is 0,97 and the contraction coefficient is 0,64.
Calculate:
(i)
(ii)
The value of the discharge coefficient CQ
The time that it will take for all the water in the tank to flow out
through the orifice.
(2)
(5)
______________________________________________________________________
2. (a)
A jet of liquid issues horizontally from an orifice in the vertical side of the tank.
(i)
(ii)
(b)
Derive an expression for the actual velocity of the jet v if the jet
falls a distance y vertically in a horizontal distance x measured
from the vena contracta.
(6)
If the head of liquid above the orifice is h, what will be the
coefficient of velocity?
(5)
A circular orifice, 650 mm2 in area, is made in the vertical side of a tank.
If the jet falls vertically through 0,5 m while moving horizontally through
1,5 m and the discharge is 0,10 m3/min of water, determine the horizontal
reaction of the jet on the tank.
(9)
______________________________________________________________________
3. (a)
(b)
Define the coefficients used in connection with flow through orifices,
explaining why these coefficients are necessary.
Describe, with sketches, three different types of orifices, indicating the
approximate values of the coefficient of discharge for each.
FES 500 Question Bank 2015-02
(4)
(4)
Page 2 of 10
(c)
A 25 mm diameter nozzle discharges 0.76 m3 of water per minute when
the head is 60 m. The diameter of the jet is 22.5 mm. Determine the value
of the coefficients due to fluid resistance.
(12)
______________________________________________________________________
4. (a)
(b)
(c)
Develop an expression for the force exerted by a jet of water which strikes
a stationary flat plate normally.
(8)
The nozzle of a fire hose produces a 50 mm diameter jet of water. If the
discharge is 85 dm³/s, calculate the reaction of the jet if the jet velocity is
10 times the velocity of the hose.
(5)
Water leaves a hose at a rate of 1,5 Kg/s with a speed of 20m/s and is
aimed at the side of a car which stops it. What is the force exerted by
the water on the car?
(7)
______________________________________________________________________
5. (a)
(b)
Calculate the water hammer when a 50 mm diameter nozzle with a
jet reaction of 78N is suddenly closed.
A rectangular tank with internal dimensions of 2 m by 3 m receives water
from a 100 mm pipe. The tank feeds two nozzles with internal diameter
of 20 mm and 30 mm respectively. The nozzle pressure is 700 kPa in
both cases.
(i)
(ii)
(c)
(2)
Calculate the velocity of the water in the 100 mm pipe if the water
level in the tank remains constant when only the 30 mm nozzle is
in operation.
(4)
Calculate the drop in water level in the tank after one hour of
simultaneous operation of the two nozzles.
(4)
Explain the venturi meter as an example of the practical application of
Bernoulli’s equation.
(10)
______________________________________________________________________
6. (a)
(b)
(c)
State the Principle of Archimedes and explain its application to a floating
body.
(8)
A ship floating in sea water displaces 115 m3. Calculate:
(i)
The weight of the ship if sea water has a density of 1025 Kg/m3
(3)
(ii)
The volume of freshwater of density 1000 Kg/m3 which the ship
would displaces
(3)
List and sketch the three (3) possible conditions of equilibrium.
(6)
______________________________________________________________________
7. Give formulae and illustrate shock losses by means of sketches.
(20)
______________________________________________________________________
8. (a)
A liquid of constant density is = 960 kg/m3 flowing steadily through the tube
below.
The diameters at the sections are d1 = 100 mm and d2 = 80 mm.
Calculate the gauge pressure at section 2.
FES 500 Question Bank 2015-02
(16)
Page 3 of 10
Gauge pressure at 1 is 200 kpa and the velocity is 5 m.s
(b)
Name the restrictions in the applicability of Bernoulli’s equation.
(4)
______________________________________________________________________
9. (a)
A fire engine stands on a slight rise, 30 m above the point where the
water leaves the nozzle. To convey the water from the fire engine to
the nozzle 5 lengths of fire hose, each 100 m long and with an
internal diameter of 70 mm, are used. The friction coefficient for the
hose is 0,005 and the factor k for each of the 6 couplings is 0,2. There
are two sharp bends (k = 1,5) and 3 slight bends (k = 0,4) in the whole
ength of the hose. The flow rate through the system is 750liters.min-1.
Calculate:
(i)
The pressure head loss in the whole length of the hose as a result
of friction.
(4)
(ii)
The pressure head loss due to shock losses.
(5)
(iii)
The pressure required at a 30 mm internal diameter nozzle to
maintain this flow rate.
(3)
The pressure at the pump outlet of the fire engine.
(5)
(iv)
(b)
State the formulae to calculate shock losses at sudden contractions.
(3)
______________________________________________________________________
10. (a)
(b)
Derive an expression for the loss of head due to friction in a pipeline in
terms of the velocity head, assuming that the frictional resistance per
unit area of pipe wall is proportional to the square of the mean velocity
of flow.
(15)
Find the loss of head due to friction in a pipe 300 m long and 150 mm
diameter when the discharge is 2.73 m3/min and the resistance
coefficient f = 0.01.
(5)
______________________________________________________________________
11. Explain all aspects of Bernoulli’s equation, formula and theorem.
(20)
______________________________________________________________________
12. (a)
The cross-section of a closed canal is an equilateral triangle of which the
circumference is 660 mm. Water flows in the canal with a velocity of 5 m.s-1.
What diameter must a cylindrical pipe have to carry the same quantity of
water at a velocity of 3 m.s-1.
FES 500 Question Bank 2015-02
(6)
Page 4 of 10
(b)
Calculate the flowrate through the Venturi meter in each of the following
cases:
(i)
(ii)
Water flows through the meter and the difference in height
between the two mercury surfaces in the manometer is 70 mm.
(8)
Petrol with a relative density of 0,9 flows through the meter and
the mercury surfaces are 80 mm apart.
(6)
______________________________________________________________________
13. Water flows upwards through a vertical venturi meter of which the entry diameter
is 150 mm and the throat diameter is 75 mm. The pressure tapping in the throat
is 200 mm above the pressure tapping in the entry section.The coefficient of
discharge is 0,98. Instead of a manometer, a Bourdon Gauge is coupled to each
of the pressure tappings.
(i)
(ii)
What is the discharge through the venturi meter if the difference
in reading between the two Bourdon gauges is 40 kpa?
(12)
Find the discharge if oil (R.D. = 0,8) flows through the meter and
all other factors remain the same as before.
(8)
______________________________________________________________________
14. There is an orifice with a diameter of 50 mm in the vertical side of a tank, at a depth
of 4,5 m below the surface of the water in the tank. Water flows out of the orifice at
a rate of 692 liters/min-1.
(i)
Find the value of the discharge coefficient.
(12)
(ii)
If the coefficient of velocity, Cv, has a value of 0, 95, what is the
value of the coefficient of contraction
(3)
What is the diameter of the jet at the vena contracta?
(5)
(iii)
______________________________________________________________________
15. Discuss the different types of Radiation.
(20)
______________________________________________________________________
16. (a)
(b)
(c)
(d)
Eight cells, each having an emf of 1,5volts and an internal resistance
of 0,2 Ohm are connected in series. What current will be sent through
a lamp connected across the terminals if the resistance of the lamp is
4,4 ohms? Calculated the potential difference of the battery if the lamp
burns.
(3)
Ten cells, each with emf 1,5volts and an internal resistance of 0,2 Ohm,
are connected in parallel. What current will they generate through a
resistor of 2 Ohms?
(3)
Fifteen cells, each with an emf of 1,5volts and each having an internal
resistance of 0,2 Ohm, are connected in three rows of five cells
connected in series, the three rows being in parallel.
(3)
An electric iron whose resistance is 40 Ohms is connected to a 220volt
supply. What power will it use?
(2)
FES 500 Question Bank 2015-02
Page 5 of 10
(e)
(f)
(g)
A 960 Watt heater is connected to a 240volt supply. Calculate the current
flowing through the heater and the heater’s resistance.
(3)
Calculate the heat generated by an electric iron whose resistance is
30 Ohms when a current of 8 amperes flows through the iron for 15
minutes.
(3)
A cast iron rod 25m long is heated from 20°C to 200°C. The coefficient
of linear expansion is 6,28 x 10-6 / °C. Calculate the final length of the
rod.
(3)
______________________________________________________________________
17. (a)
(b)
An iron plate 2cm thick has a cross section of 0,5m2. One side is at
150ºC and the other is at 140ºC. What is the rate of heat transfer?
The thermal conductivity of iron is 60Wm-1K-1.
(5)
A plate of nickel 0,4cm thick has a temperature difference of 32ºC
between its faces. It transmits 800kJ per hour through an area of
5cm2. Calculate the thermal conductivity of nickel?
(5)
(c)
A mass of oxygen occupies 550liters at 5ºC and 1.013 x 105 Pa pressure.
Determine its volume at 30ºC and 1,066 x 105 Pa pressure.
(5)
(d)
To what pressure must a liter of gas measured at 1.0 x 105 Pascal’s
and -20ºC be subjected to be compressed to 1/2 liter when the temperature
is 40ºC?
(5)
______________________________________________________________________
18. (a)
(b)
Calculate the resistance of a copper conductor 1,5km long having a
diameter of 1,2mm. The resistivity is 1,5 x 10-6 Ώm.
An Electric motor is connected to a 230volt supply and a current 12
Amperes flows through the motor. Calculate:
(i)
(ii)
(c)
(d)
(3)
the power input
the energy used if the motor operates for 12 hours
A 250volt supply causes a current of 15 amperes in a heater. Calculate
the cost of using the heater for 12 hours at 5 cents per kWh.
(3)
(3)
(3)
A 100 W lamp burns for 5 hours. If the voltage is 220volts, calculate:
(i)
(ii)
(iii)
the current flowing through the lamp
the energy generated in 5 hours
the cost in involved if 3,6 MJ energy costs 5 cents
(3)
(3)
(2)
______________________________________________________________________
19. (a)
(b)
Solve the equation
If the quadratic equation
use of the formula
Derive this formula.
(5)
cannot be factorized, we make
to find the two roots.
(15)
______________________________________________________________________
FES 500 Question Bank 2015-02
Page 6 of 10
20. (a)
A truck whose mass is 1 Mg has a tractive resistance of 36 N per
hundred kilograms of the truck’s mass.
Calculate:
(i)
(ii)
(b)
(c)
The work done if the truck is moved 600 meters
The power if the truck moves at 72 km/h
(3)
(3)
Twenty cells each have an emf of 1,8 volts and an internal resistance
of 0,75 ohm. They are arranged in five rows, each row having four
cells in series. If an external resistor of 1,2 ohms is connected to the
terminals, calculate:
(i)
The current
(5)
(ii)
The potential difference across the terminal of the internal
resistance
(3)
Calculate the heat energy required to heat 100 grams of copper
from 10C to 100C.
(4)
The same quantity of heat is added to 100 grams of aluminium
at 10C. Which gets hotter, the copper or the aluminium? Specific
heat capacity of Cu = 385 J kg K of Al = 913 J kg K .
(2)
(i)
(ii)
______________________________________________________________________
21. (a)
(b)
(c)
State the laws of kinetic friction.
Calculate the force needed to move a mass of 30 kg horizontally to
the surface if the coefficient of friction is 0,4.
(6)
(6)
A body whose mass is 300 kg is supported 20 m above the earth’s surface.
(i)
(ii)
Calculate its potential energy.
If the body is allowed to fall, what will its velocity be just before
it comes to rest?
(4)
(4)
______________________________________________________________________
22. (a)
A steam boiler is made of steel and has a mass of 400 kg. The boiler
contains 180 kg of water. Assuming that 70% of the heat is delivered to
boiler and water, how much heat is required to raise the temperature
of the whole from 5ºC to 100ºC?
Specific heat capacity of steel is 460 J Kg-1 K-1.
(b)
(c)
(7)
Exactly 3kg of carbon was burned to CO2 in a copper calorimeter. The
mass of the calorimeter was 1,5kg, and the mass of water in the
calorimeter was 2 kg. The initial temperature was 20ºC and the final
temperature 31ºC. Calculate the heat value of carbon in J kg-1.
Specific heat capacity of copper is 385 J kg-1 K-1.
(7)
Explain the calorific value of a substance.
(6)
______________________________________________________________________
FES 500 Question Bank 2015-02
Page 7 of 10
23. (a)
Give balanced chemical equations for the following reactions:
(i)
Preparation of Hydrogen Sulphide (H2S) by adding Hydrochloric
Acid to Iron (II) Sulphide (FeS)
(3)
(ii)
Sulphuric Acid (H2SO4) oxidises copper to cupric oxide (CuSO4)
(3)
(iii)
Preparation of Hydrogen Chloride (HCl) by adding Sulphuric
(H2SO4) to table salt (NaCl)
(3)
The reaction of Sulphuric Acid with saltpetre (KNO3)
(3)
(iv)
(b)
Give four (4) uses of Sulphuric Acid
(c)
Give the common name for the following;
(i)
(ii)
(iii)
(iv)
Calcium Sulphate
Copper Sulphate
Magnesium Sulphate
Potassium Nitrate.
(4)
(1)
(1)
(1)
(1)
______________________________________________________________________
24. (a)
A gas exerts a pressure of 100 Kpa. What pressure will this gas exert
at standard temperature if the volume of gas is kept constant?
(5)
A gas has a volume of 1 litre at standard temperature. What volume will
this gas occupy at 330ºC. (The pressure remains constant).
(5)
(c)
Explain standard temperature and pressure.
(4)
(d)
State and explain the difference gas laws.
(6)
(b)
______________________________________________________________________
25. (a)
(b)
What is the volume of 24g oxygen (O2) at STP?
(Molar volume = 2,2 x 10-2 m3 mole -1. Atomic mass of oxygen = 16u.
(4)
Calculate the mass of calcium carbonate (in kg) required to liberate
0,11kg carbon dioxide when burning. The equation of the reaction is
the following:
CaCO3 = CaO + CO2
Atomic mass: Ca = 40 u, C = 12 u, O = 16 u.
(6)
(c)
Explain nuclear reactions?
(5)
(d)
Explain the cloud chamber?
(5)
______________________________________________________________________
26. (a)
(b)
Explain industrial preparation and uses of Nitrogen.
(10)
List the uses of:
(i)
(ii)
Ammonia.
Ammonium salts.
(5)
(5)
______________________________________________________________________
FES 500 Question Bank 2015-02
Page 8 of 10
27. Discuss the oxidation of a metal in detail.
(20)
______________________________________________________________________
28. Supply balanced chemical equations for the following reactions:(i)
Steam is passed over red hot iron
(4)
(ii)
Sodium hydride reacts with water
(2)
(iii)
Calcium Carbide reacts with water to yield a lot of acetylene
(3)
(iv)
Aluminum carbide decomposes in water to yield methane
(4)
(v)
White Phosphorous ignites in air and yield phosphorous
pentoxide fumes
(3)
Nitric acid neutralizes potassium carbonate
(4)
(vi)
______________________________________________________________________
29. (a)
(b)
Explain organic chemistry.
Explain the following and give an example of each
(i)
(ii)
(iii)
(c)
(2)
The empirical formula
The molecular formula
The structural formula
(2)
(2)
(2)
Give the formula for the following alkanes
(i)
(ii)
(iii)
(iv)
Methane
Ethane
Propane
Butane
(1)
(1)
(1)
(1)
(d)
State the physical properties of alkanes
(2)
(e)
State the chemical properties of the alkanes
(2)
(f)
State the industrial importance of the alkanes
(2)
(g)
Give the structural formula for
(i)
(ii)
Ethylene
Acetylene
(1)
(1)
______________________________________________________________________
30. (a)
(b)
Explain the ideal gas model.
(10)
What basic physical assumptions (or postulates) are made for ideal
gases?
(10)
______________________________________________________________________
31. (a)
Name the uses for each of the following :
(i)
FES 500 Question Bank 2015-02
Nitric Acid.
(5)
Page 9 of 10
(ii)
(b)
Sulphuric Acid.
(5)
Give the common names for the following :
(i)
(ii)
(iii)
(iv)
(v)
Calcium sulphate.
Copper sulphate.
Magnesium sulphate.
Sodium sulphate.
Iron sulphate.
(2)
(2)
(2)
(2)
(2)
______________________________________________________________________
32. Discuss the factors which influence the rate of chemical reactions.
(20)
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33. (a)
What similarities are there between ordinary combustion and breathing?
(2)
(b)
Write down in your own words what is meant by combustion?
(3)
(c)
What products are formed when a substance burns in oxygen?
(2)
(d)
Write down balanced equations for three different substances with
oxygen and their end-products?
(9)
(e)
Define an exothermic and endothermic reaction.
(2)
(f)
Define fire.
(2)
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FES 500 Question Bank 2015-02
Page 10 of 10