
Revision 2 Unit 5
Authored by tasnim ghorbel
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15 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Motor branch circuits
For continuous-duty motors, the load on the branch circuit feeding a single motor is taken as …………….. of the full-load rated current of the motor.
200 %
125%
110%
100%
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Motor branch circuits
What is the full load current for a 50-hp three-phase Synchronous motor if the armature voltage rating is 460 V?
41 A
52 A
61 A
101 A
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Motor feeders and mains
The maximum-demand running current can be used in ……………………………….
a. determining the size of the wire required to carry the current safely and computing the voltage drop of the circuit.
a. determining the size of wire required to carry the current safely
a. determining the proper size of short-circuit and ground-fault protective devices for the circuit,
No answer is correct
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Motor feeders and mains
What is the percentage of full-load current which can be used to determine the starting current for single phase motor and the protection device is the inverse time breaker
800 %
250 %
175 %
300 %
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Motor feeders and mains
Determine the maximum-demand starting current and maximum-demand running current for a 120-V DC feeder supplying five 3-hp motors, four 5-hp motors, and two 7.5-hp motors. The protection device is an inverse time breaker
a. Maximum-demand starting current = 347.7 A, Maximum-demand running current= 366.7 A
a. Maximum-demand starting current = 327.1 A, Maximum-demand running current= 312.6 A
a. Maximum-demand starting current = 114 A, Maximum-demand running current= 252.7 A
Maximum-demand starting current = 252.7 A, Maximum-demand running current= 95 A
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Voltage drop
Which of the following formulas is used for computing the voltage drop in single-phase circuits when the effect of inductance can NOT BE NEGLECTED
VD=2K*L*I
VD=2R*L*I
VD=(2K*L*I)/cmil
VD= Drop factor* dc voltage drop
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Voltage drop: when the effect of inductance CAN BE NEGLECTED
What will be the voltage drop of the motor feeder if the length of the circuit is 250 ft and a 4/0 AWG Type RH copper wire is employed and maximum-demand running current of 200 A and the carrying capacity of 230 A?
“Use R not K”
3666.2 V
3.6662 V
6.26 V
6260 V
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