Download CHAPTER 3 ELEC REVIEW KEY

ELPT 1311 – Basic Electrical Theory
Chapter 03, Basic Electric Components
KEY
Name ________________________________________
1
The material used to isolate a conductor from its environment is referred to as
__________.
a)
b)
c)
d)
2
Copper is the most commonly used conductor material because __________.
a)
b)
c)
d)
3
it has poor elasticity
it has high resistivity
it is too expensive
it is not flexible enough
Wire gage is based upon __________.
a)
b)
c)
d)
5
it is the cheapest
it has the lowest resistance
it is the best compromise between price and low resistance
it is the most flexible
Aluminum is not used as often as copper in wires because __________.
a)
b)
c)
d)
4
an isolator
an insulator
a semiconductor
a conduit
the area in cmils and the length of the wire
ampacity
ampacity and wire length
the area in cmils
The ampacity rating of a wire is determined by __________.
a)
b)
c)
d)
e)
the gage of the wire
the temperature of the wire
the ambient temperature
the wire material
all of the above
1
6
Conductors on printed circuit boards are called __________.
a)
b)
c)
d)
7
An insulator can begin to conduct if __________.
a)
b)
c)
d)
8
lower resistance
higher resistance
lower power handling
higher power handling
A high tolerance resistor is __________ than a low tolerance resistor.
a)
b)
c)
d)
11
the diameter of the leads
the purity of the carbon
the density of the carbon
the diameter of the resistor
Wire wound resistors have _________ than carbon-composition resistors.
a)
b)
c)
d)
10
a high enough voltage is applied
a high enough current is applied
it is cold enough
if it is too thick
The resistance value of a carbon composition resistor is determined during the
manufacturing process by __________.
a)
b)
c)
d)
9
traces
PCBs
inductors
commons
better
worse
has a higher accuracy
none of the above, it depends on the value.
A 22 kΩ resistor with a 5% tolerance may have a variation in resistance that is
__________ a 47 kΩ resistor with a 2% tolerance.
a)
b)
c)
d)
higher than
lower than
equal to
cannot be determined with the information provided.
2
12
The middle terminal of a potentiometer is called __________
a)
b)
c)
d)
13
For potentiometers, RAC = RAB + RBC when __________.
a)
b)
c)
d)
14
the wiper arm
the common terminal
the ground terminal
the reference terminal
the shaft is fully turned clockwise
the shaft is fully turned counterclockwise
the shaft is in the center
all of the above
Multi-turn pots have __________ than single turn pots.
a)
b)
c)
d)
higher power handling
a more linear taper
better resolution
all of the above
15
True or False. A potentiometer can be wired as a rheostat.
16
Rheostats are used to __________.
a)
b)
c)
d)
17
control voltage
control current
divide current
divide voltage
Between the terminals of a battery is __________.
a) an electrolyte
b) a potential difference
c) a voltage
d) all of the above
18
Secondary cells __________.
a)
b)
c)
d)
have a dry electrolyte
can only be used once
are rechargeable
none of the above
3
19
Connecting two batteries in series __________.
a)
b)
c)
d)
20
The common terminal in a DC power supply is __________.
a)
b)
c)
d)
21
pole
throw
wiper
break
A DPST switch ___________.
a)
b)
c)
d)
23
the voltage reference for the positive voltage
the voltage reference for the negative voltage
at zero volts potential
all of the above
The moving component of a switch is referred to as __________.
a)
b)
c)
d)
22
doubles the maximum current
doubles the voltage
doubles the voltage but halves the current
doubles the current but halves the voltage
has two poles and one throw
has four terminals
can only be closed in one position
all of the above
The voltage rating of a fuse tells you __________
a) the minimum voltage that will cause the fuse to blow
b) the maximum voltage that will cause the fuse to blow
c) the minimum voltage that will cause the blown fuse to
conduct
d) the maximum voltage that will cause the blown fuse to conduct
24
Slow-blow fuses are used in __________.
a)
b)
c)
d)
low current conditions
high current conditions
circuits that experience brief current surges
circuits that have brief current drop outs
4
25
The difference between Type S fuses and Type T fuses is __________
a)
b)
c)
d)
26
Circuit breakers are classified as __________.
a)
b)
c)
d)
27
-
-
1.47 M kΩ
(3) Determine the guaranteed range for values of a 360 kΩ resistor with a 5%
tolerance.
378 kΩ
30
107.8 kΩ
(2) Determine the guaranteed range of values for a 1.5 MΩ resistor with 2%
tolerance
1.53 MΩ
29
magnetic type
thermal type
thermo-magnetic type
all of the above
(1) Determine the guaranteed range of values for a 110 kΩ resistor with a 2%
tolerance
112.2 kΩ
28
Type T fuses handle more power than Type S fuses
Type S fuses can handle more power than Type T fuses
Type S fuses cannot be replace with a different amperage
Type T fuses cannot be replace with a different amperage
-
342 kΩ
(4) Determine the guaranteed range for values of a 6.8 Ω resistor with a 10%
tolerance.
7.48 Ω
-
6.12 Ω
5
31
(5) For each of the color codes listed, determine the value for the resistor.
Band 1
32
Band 2
Band 3
a) Brown
Blue
Brown
__________
b) Red
Violet
Green
__________
c) Orange
White
Yellow
__________
d) Green
Brown
Black
__________
e) Yellow
Violet
Gold
__________
f)
Blue
Orange
__________
Green
(6) For each of the color codes listed, determine the value for the resistor.
Band 1
Band 2
Band 3
a) Red
Black
Brown
__________
b) Orange
Black
Silver
__________
c) Green
Brown
Black
__________
d) White
Brown
Green
__________
e) Brown
Blue
Blue
__________
f)
Gray
Silver
__________
Blue
6
33
(7) Determine the color for the first three bands for each of the following resistor
values.
Band 1
Band 3
a) 33 kΩ
__________ __________
__________
b) 15 Ω
__________ __________
__________
c) 910 k Ω
__________ __________
__________
d) 2.2 k Ω
__________ __________
__________
e) 129 k Ω
__________ __________
__________
10 M Ω
__________ __________
__________
g) 1.8 Ω
__________ __________
__________
h) 0.24 Ω
__________ __________
__________
f)
34
Band 2
(8) Determine the color for the first three bands for each of the following resistor
values.
Band 1
Band 2
Band 3
a) 11 Ω
__________ __________
__________
b) 20 MΩ
__________ __________
__________
c) 680 Ω
__________ __________
__________
d) 3.3 Ω
__________ __________
__________
e) 160 k Ω
__________ __________
__________
0.13 Ω
__________ __________
__________
g) 9.1 MΩ
__________ __________
__________
h) 36 Ω
__________ __________
__________
f)
7
35
(9) For each of the color codes listed, determine the rated component value and
the guaranteed range of measure values.
Band 1
36
Band 2
Band 3
Band 4
Value
Range
a) Red
Orange
Yellow
Gold
______
______
b) Orange
Blue
Gold
Red
______
______
c) Gray
Red
Black
Gold
______
______
d) Blue
Gray
Silver
Red
______
______
(10) For each of the color codes listed, determine the rated component value and
the guaranteed range of measure values.
Band 1
Band 2
Band 3
Band 4
Value
Range
a) Yellow
Orange
Silver
Gold
______
______
b) Brown
Gray
Yellow
Red
______
______
c) Yellow
Violet
Orange
Silver
______
______
d) Brown
Green
Silver
Gold
______
______
8
37
Number the steps in order for the procedure to measure resistance with an
analog multimeter.
__4____ Connect the test leads in parallel with the resistance to be measured.
__2____ Place the range switch at the highest range.
__6____ Again short the test leads to each other at the selected range and zero
the meter for zero ohms.
__1____ Place the function switch in the +DC position.
__3____ Short the test leads to each other and zero the meter for zero ohms.
__7____ Reconnect the meter to the resistance to be measured; read the meter.
__5____ Decrease the range switch until the meter has an appropriate response
for the current being measured.
38
Read and write the VOM indication below. 1400 ohms 1.4 k ohm
9
39
Read and write the VOM indication below. 34 v dc
40
Read and write the VOM indication below. 5.8 v ac
10