Download July 2013

DME
TUTOR MARKED ASSIGNMENT
BET-037
FLUID MECHANICS
Maximum Marks : 100
Weightage : 30%
Course Code: BET-037
Last Date of Submission: October 31, 2013
Note : All questions are compulsory and carry equal marks.
Q.1 (a)
(b)
Q.2 (a)
(b)
What is centre of buoyancy? Explain stable and unstable equilibrium.
What do you understand by ‘Fluid Mechanics’? Explain about dimensions and units
used in ‘FM’.
(5+5)
What is vapour pressure? Discuss the importance of saturated vapour pressure.
When a pressure of 21 MN/m2 is applied to 90 litres of a liquid, its volume decreases by
one litre. Find the bulk modulus of liquid and identify it.
(5+5)
Q.3 (a)
(b)
Explain the following types of flow with suitable examples – laminar flow, turbulent flow,
uniform and non-uniform flow, rotational and irrotational flow, compressible and
incompressible flow.
Derive “Darcy-Weisbach equation”
(5+5)
Q.4 (a)
Explain how following coefficients are determined experimentally when water flows
through orifice : coefficient of contraction, coefficient of velocity, coefficient of discharge
and coefficient of resistance.
(b)
A 1.0 m diameter circular tank contains water upto 3.5 m. At the bottom of tank an
orifice of 30 mm is provided. Find the height of water above the orifice after 2.0 minutes.
(5+5)
Q.5 (a)
Explain how the discharge in open channel is measured.
(b)
Explain briefly, types of open channels and types of flow.
(5+5)
Q.6 (a)
What is Darcy-Weisbach equation. Find the loss of head due to friction in a pipe
carrying water. The pipe is 500 m long and 20 cm in diameter. The discharge through
the pipe is 0.05 m3/sec. Take f = 0.035.
(b)
Two reservoirs are connected by a pipe line consisting of two pipes, one of 20 cm
diameter and 5 m length and other of diameter 2.25 cm and 15 m length. If the
difference of water levels in the two reservoirs is 5 m, calculate the discharge. Take f =
0.035.
(5+5)
1
Q.7 (a)
(b)
Derive the equation for flow through a nozzle at the end of a pipe.
A 3000 m long pipeline is used for transmission of power. 150 kN power is to be
transmitted through the pipe in which water having a pressure of 3000 kN/m 2 at inlet is
flowing. If the pressure drop over the length of pipe is 800 kN/m2 and f = 0.006 find
diameter of pipe and efficiency of transmission.
(5+5)
Q.8 (a)
(b)
Explain Chezy and Manning’s equations.
A trapezoidal canal has a bottom width of 3.5 m and side slopes 1 V to 2 H. If
the bed slope is 1 in 4000 and depth of flow is 2 m. Find discharge by various
equations known to you.
(5+5)
Q.9 (a)
(b)
A circular sewer with 0.6 m in diameter is laid at a slope of 1 in 300. What is
maximum velocity of flow and corresponding discharge. Take C = 60.
Show that hydraulic mean depth of a trapezoidal canal having best proportion is half of
the maximum depth.
(5+5)
Q.10 Write short notes on following :
(i)
Coplaner forces,
(ii)
Velocity distribution in circular pipe,
(iii)
Syphon technique, and
(iv)
Minor losses in pipes.
(2.5 X 4 = 10)
2
DME
TUTOR MARKED ASSIGNMENT
BEE-042
ELECTRONICS
Maximum Marks : 100
Weightage : 30%
Course Code : BEE-042
Last Date of Submission : October 31, 2013
Note : All questions are compulsory and carry equal marks.
Q.1 (a)
Select the correct answer from the given Four alternatives.
(i)
(ii)
(iii)
(iv)
(v)
Classification of materials can be done on the basis of:
(a)
Faraday’s region
(b)
Crooke’s gap
(c)
Forbidden gap
(d)
Fermi gap
In a reverse bias mode, a diode offers:
(a)
Very high capacitance
(b)
Very high resistance
(c)
Very low resistance
(d)
Very low inductance
The efficiency of a full wave rectifier is :
(a)
81.2%
(b)
40.6%
(c)
20.3%
(d)
90.6%
In a common emitter configuration of a transistors we get :
(a)
Low power gain
(b)
Unity power gain
(c)
Zero power gain
(d)
High power gain
Current gain for a transistor in common base configuration is :
(a)
Just less than 1
(b)
Just greater than 1
(c)
Much lesser than 1
(d)
Much greater than 1
3
(b)
State ‘true’ ‘or false’ for the given statements:
(i)
An SCR has an advantage of high switching speed over electromagnetic relay.
(ii)
A series wound DC motor can not exert a high starting torque.
(iii)
Multi channel displaying capacity is possible in dual beam oscilloscope.
(iv)
There is very high electric field in the depletion layer of a p-n junction.
(v)
In a common base amplifier the output signal is 180o out of phase with the input
signal.
(5+5)
Q.2 (a)
(b)
Explain the working of Half wave rectifier clearly showing its output & input wave forms.
What is a Zener diode? Draw its V-I characteristics.
(5+5)
Q.3 (a)
(b)
Let  = 0.97 for a BJT. Determine its . For the same transistors if the emitter current is
1 milliampere, determine the base and collector currents.
Draw the input and output characteristics of an amplifier in common emitter mode.
(5+5)
Q.4 Figure 1 shows the two waveforms are fed to the two inputs of the NAND gate. Draw the
output waveform.
A
B
o
t1
t2
t3
t4
t5
Figure 1
(10)
Q.5 (a)
(b)
How can you make a AND gate using ‘OR’ gates only? Explain it.
Write the truth table for a NAND gate, connected as shown in Figure 2.
A
y
Figure 2
(5+5)
Q.6 Explain the working principle of DC motor as an actuator.
(10)
Q.7 Discuss single phase AC motor as an actuator.
(10)
Q.8 Discuss SCR with clearly explaining its voltage current characteristics and Voltage safety
factor.
(10)
Q.9 (a)
With the help of a diagram explain the working of a monochromatic television
transmitter circuit.
4
(b)
A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it
detect a wavelength of 6000 nm?
(5+5)
Q.10 Write short notes on the following :
(i)
Function elements of a generalized measuring system
(ii)
LVDT
(iii)
Turbine flow meter
(iv)
Optical transducer
(2.5 X 4 = 10)
5
DME
TUTOR MARKED ASSIGNMENT
BME-044
INDUSTRIAL MANAGEMENT
Maximum Marks : 100
Weightage : 30%
Course Code : BME-044
Last Date of Submission : October 31, 2013
Note : All questions are compulsory and carry equal marks.
Q.1 Discuss the role of managers in the effective management of an organization.
(10)
Q.2 Describe the different levels of management.
(10)
Q.3 Write about decision making process with the help of suitable examples.
(10)
Q.4 What are preventive measures for safety in a manufacturing company? How preventive
measures are effective in avoiding accidents?
(10)
Q.5 What is the span of control? Discuss the factors influencing span of control by taking suitable
example of any organization.
(10)
Q.6. What is coordination? Explain how coordination is different from departmentation.
(10)
Q.7 What is leadership? Discuss major qualities of a good leader. Also discuss his/her functions.
(10)
Q.8 (a)
What do you understand by central safety committee? Describe the roles of central
safety committee.
(b)
What are various protective devices? Discuss the significance of protective devices in
an organization.
(5+5)
Q.9 (a)
(b)
Describe oral and non-verbal communication.
Describe Theory X and Theory Y with the help of suitable examples.
(5+5)
Q.10 Write short notes on the following:
(i)
Training Methods.
(ii)
Workmen’s Compensation Act.
(5+5)
6
DME
TUTOR MARKED ASSIGNMENT
BME-053
APPLIED THERMAL ENGINEERING
Maximum Marks : 100
Weightage : 30%
Course Code : BME-053
Last Date of Submission : October 31, 2013
Note : All questions are compulsory and carry equal marks.
Q.1
The minimum pressure and temperature in an Otto cycle are 100 kPa and 27C. The
amount of heat added to the air per cycle is 1500 kJ/kg.
(i)
Determine the pressures and temperatures at all points of the air standard Otto
cycle.
(ii)
Also calculate the specific work and thermal efficiency of the cycle for a
compression ratio of 8 : 1.
Take for air : cv = 0.72 kJ/kg K, and  = 1.4.
(5+5)
Q.2 (a)
A diesel engine has a compression ratio of 15 and heat addition at constant pressure
takes place at 6% of stroke. Find the air standard efficiency of the engine. Take  for air
as 1.4.
(b)
An engine with 200 mm cylinder diameter and 300 mm stroke works on theoretical
Diesel cycle. The initial pressure and temperature of air used are 1 bar and 27C. The
cut-off is 8% of the stroke. Determine :
(i)
Pressures and temperatures at all salient points.
(ii)
Theoretical air standard efficiency.
(iii)
Mean effective pressure.
(iv)
Power of the engine if the working cycles per minute are 380.
Assume that compression ratio is 15 and working fluid is air.
Consider all conditions to be ideal.
Q.3 (a)
(5+5)
An I.C. engine operating on the dual cycle (limited pressure cycle) the temperature of
the working fluid (air) at the beginning of compression is 27C. The ratio of the
maximum and minimum pressures of the cycle is 70 and compression ratio is 15. The
amounts of heat added at constant volume and at constant pressure are equal.
Compute the air standard thermal efficiency of the cycle. State three main reasons why
the actual thermal efficiency is different from the theoretical value.
Take  for air = 1.4.
7
(b)
Find the thermal efficiency of a Carnot engine whose hot and cold bodies have
temperature of 154C and 15C respectively.
(5+5)
Q.4 (a)
(b)
Discuss the relative advantages and disadvantages of internal combustion and external
combustion engines.
(i)
State the function of a carburetor in a petrol engine.
(ii)
Describe a simple carburetor with a neat sketch and also state its limitations.
(5+5)
Q.5 What is the function of a governor? Enumerate the types of governors and discuss with a
neat sketch the Porter governor.
(10)
Q.6 (a)
Compare the relative advantages and disadvantage of four stroke and two stroke cycle
engines.
(b)
Explain the phenomena of knocking in S.I engine. What are the different factors which
influence the knocking? Describe the methods used to suppress it.
(5+5)
Q.7 (a)
(b)
Why do we feel the necessity of cooling an I.C. engine?
Explain briefly the following methods of cooling I.C. engines: Air cooling, Liquid cooling.
Also state their relative advantages and disadvantages.
(5+5)
Q.8 (a)
What do you mean by ‘octane number’ and ‘cetane number’ of fuels? How are they
determined?
(b)
A 4-cylinder petrol engine works on a mean effective pressure of 5 bar and engine
speed of 1250 r.p.m Find the indicated power developed by the engine if the bore is
100 mm and stroke 150 mm.
(5+5)
Q.9 (a)
A 4-cylinder, four-stroke diesel engine runs at 1000 r.p.m. The bore and stroke of each
cylinder are 100 mm and 160 mm respectively. The cut-off is 6.62% of the stroke.
Assuming that the initial condition of air inside the cylinder are 1 bar and 20C,
mechanical efficiency of 75%, calculate the air-standard efficiency and brake power
developed by the engine.
(b)
Describe with a neat sketch the construction and working of a single-stage
single-acting reciprocating air compressor.
(5+5)
Q.10 (a)
(b)
A single-stage single-acting air compressor running at 1000 r.p.m. delivers air at
25 bar. For this purpose the induction and free air conditions can be taken as 1.013 bar
and 15C, and the free air delivery as 0.25 m3/min. The clearance volume is 3% of the
swept volume and the stroke bore ratio is 1.2 : 1. Calculate the bore and stroke and the
volumetric efficiency of this machine. Take the index of compression and expansion as
1.3. Calculate also the indicated power and the isothermal efficiency.
What do you mean by ‘gas turbine’? How are gas turbines classified?
(5+5)
8
DME
TUTOR MARKED ASSIGNMENT
BME-054
MANUFACTURING PROCESSES-II
Maximum Marks : 100
Weightage : 30%
Course Code : BME-054
Last Date of Submission : October 31, 2013
Note : All questions are compulsory and carry equal marks.
Q.1 Define welding. What are the various types of welding processes? Elaborate on each method
with suitable example of welding process.
(10)
Q.2 Define gas welding. What is the principle of gas welding? List out the equipments required
for Oxy-Acetylene welding. Explain each with sketches wherever necessary.
(10)
Q.3 What is TIG and MIG welding? Differentiate between TIG and MIG welding.
(10)
Q.4 Write short notes on :
(i)
Brazing,
(ii)
Braze welding, and
(iii)
Soldering.
Describe the advantages and disadvantages of Braze welding.
(10)
Q.5 What is a sawing machine? What are the types of sawing machines? List out the precautions
to be taken, while performing cutting with Hecksaw Machine.
(10)
Q.6 (a)
(b)
Compare extrusion and rolling processes.
What is press forging? How does it differ from drop forging?
(5 + 5 = 10)
Q.7 What is grinding? What is the purpose of grinding? Elaborate on defects and remedies in
grinding.
(10)
9
Q.8 What is lapping? Classify the lapping processes. Describe the lapping compounds and tools.
Also list out some lapping applications.
(10)
Q.9 Write short notes on the following :
(i)
Metal spraying, and
(ii)
Electroplating.
(5 + 5 = 10)
Q.10 Write short notes on the following :
(i)
Powder metallurgy, and
(ii)
Types of grinding machines.
(5 + 5 = 10)
10