1. Which of the following do three 150 volt parallel circuits produce the total current ?
a . 50 volts
b . 150 volts
c . 225 volts
d . 450 volts - ANSWERd
3. If a custodian in your building finds out that an office worker is using a hot plate on a circuit that already has a lot of applia...
1. Which of the following do three 150 volt parallel circuits produce the total current ?
a . 50 volts
b . 150 volts
c . 225 volts
d . 450 volts - ANSWERd
3. If a custodian in your building finds out that an office worker is using a hot plate on a circuit that
already has a lot of appliances plugged into , the safest thing to do is to :
a . remove the hot plate from the office when its owner is not present
b demand that the office worker remove the hot plate immediately
c . write a report to the supervisor of the office requesting corrective action
d . ignore the situation - ANSWERc
4. The following conditions must be met for branch circuits to be de rived from autotransformers :
a . The grounded conductor is protected from access by unauthorized personnel .
b The autotransformer operates at less than 600 volts nominal
c. An electrical connection is made be tween the grounded conductor of the supplied circuit and the
grounded conductor of the system supplying the auto transformer
d . All of the above - ANSWERc
5. It is permitted to tap two - wire AC circuits with ungrounded conductors from circuits that have
one of the following :
a . Two switching devices
b . Switches with multiple poles that operate automatically
c . Conductors that are grounded
d . None of the above - ANSWERa
,6. The voltage between the line and grounded neutral of a 208 volt , 3 phase , 4 wire circuit power
supply is approximately volts .
a 120
b . 208
c . 220
d . 240 - ANSWERa
7. Limiting the total number of circuits in an enclosure achieves the following :
a Reduces the effects of short circuits
b . Eliminates over - expansion in the future
c . Makes qualified workers easily accessible
d . Provides a standard for the Authority Having Jurisdiction - ANSWERa
12. If the number of circuits in an enclosure is limited , it will not be possible to minimize the effects
of a ground fault in just one circuit .
a True b . False - ANSWERF
13. An independent grounding connection must be for any new current transformer associated a
potentially energized circuit .
a . True b . False - ANSWERF
14. A feeder's calculated load must be 75 % or less of the sum of branch circuit loads after derating
factors are applied
a . True b False - ANSWERF
15. To supply power to screw shell lamp holders voltages over 120 volts between conductors must
not exceed 277 volts .
a True b . False - ANSWERF
3. According to Kirchoff's current law , electrical current will do which of the following in parallel
circuits :
a . Combine in the parallel path
b . Divide and flow through each parallel path
, c . Increase in voltage
d . Experience a voltage drop - ANSWERB
4. When electrical current is given mul tiple conductive paths to flow the cur rent will always take the
path of least resistance .
a . True b False - ANSWERF
1. Electrical wires were covered with asbestos protect them from damage
A. high voltage
B. high temperatures
C. water damage
D. electrolysis – ANSWERB
8. Circuits rated at less than 100 amps , or with conductors sized between 14 AWG and AWG are only
suitable for conductors of the following ratings :
a . 55 degrees C ( 131 degrees F )
b . 60 degrees C ( 140 degrees F )
c . 75 degrees C ( 167 degrees F )
d . 80 degrees C ( 176 degrees F ) - ANSWERb
9. Covers for underground pull boxes used for circuits over 600 volts that are not locked , bolted or
screwed must weigh the same as :
a . 25 pounds
b . 50 pounds
c 75 pounds
d 100 pounds - ANSWERd
11. Parallel circuits experience the following total power loss
a . Dissipation of individual power
b . Multiple the circuits the sum of their individual circuits
c . The total current flowing through each branch of the circuit
d None of the above - ANSWERa
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