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MASTER ELECTRICIAN EXAM QUESTIONS AND ANSWERS
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MASTER ELECTRICIAN EXAM QUESTIONS AND ANSWERS
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MASTER ELECTRICIAN EXAM QUESTIONS ANDANSWERS
In a farm building where livestock is housed and an equipotential plane system is
required because wire mesh or other conductive elements are embedded or placed
under concrete and bonded to metal structures that could become energized, the
equipotential plane is necessary to minimize _____ differences within the plane. -
Answers- voltage
According to the National Electrical Code, the
minimum size TW copper conductor for a 5 HP, 3
phase, 230 volt, squirrel cage motor started at full
voltage shall not be less than # ___ AWG. - Answers- 14
How many AWG #12 THHN conductors are allowed in
a 1" RMC nipple? - Answers- 35 wires
How many AWG #12 THHN conductors are allowed in
a 1" RMC? - Answers- 26 #12 THHN conductors
The circular mil area of a #18 AWG would be ___
CMILS for solid or stranded. - Answers- 1620
According to Table 8 of the NEC and assuming solid
uncoated copper conductor; cross-sectional area of
10,380 CM; resistance of 12.6 Ω/circular mill-foot
(KF), calculate the conductors resistance at 75 degrees
C. ("R" is resistance in Ohms, "L" is the length of the
conductor. Use the formula: R=KL/CM.) - Answers- 1.2 Ohm/1000 ft.
Using the information in the National Electrical Code,
table 8, calculate the total resistance of 495' of
uncoated, 18 AWG, stranded, copper. - Answers- 3.85 to 3.93 ohms
A compressor motor is rated 1HP, 115V, 16 amps. It is
connected to a receptacle providing 120 volts with a
100' extension cord. Due to the load conditions, the
maximum voltage drop allowed during starting lockedrotor
condition is 30% of motor voltage rating. Using
96 amps for locked-rotor current. Resistance equals
impendence. Use resistance values in Table 8 & 9.
What is the minimum size of uncoated copper? - Answers- 10 AWG
The cross-sectional area of a conductor is decreased by
a factor of 4. What is the new conductor's resistance? - Answers- 4 times resistance
, The circular mil area of a number 12 conductor is ____. - Answers- 6530
The cross sectional area of a conductor is compared to
a conductor that is four times its area. What is the
approximate resistance of the larger conductor
compared to the smaller? - Answers- 1/4 resistance
Eighteen, 250 KCMIL, THWN copper conductors are
in a rigid metal conduit nipple. What is the minimum
diameter in inches permitted by for the conduit?
Assume that the conductors are not lead covered and
the nipple is 1' in length. - Answers- 5"
What size RMC nipple (18" long) is required for 24,
AWG #8 THHN? - Answers- 1.25"
Using Table 4 and Table 5 of the NEC, compute the
maximum number of # 10 AWG, Type THHN, copper
conductors allowed in 32' run of 1/2" "IMC". - Answers- 6
Five conductors, in a 12" nipple of rigid metal conduit,
has a total cross sectional area of 2.5 square inches.
What is the minimum trade size conduit? - Answers- 3"
What is the internal diameter of a 1 1/4" liquid tight,
flexible non metallic conduit (type LFNC-A)? - Answers- 1.395"
When calculating the maximum number of conductors
permitted in a conduit or tubing, all of the same size,
the next higher whole number shall be used to
determine the maximum number of conductors
permitted when the calculation results in a decimal of
___ or higher. - Answers- .8
According to the NEC, a 1 1/2" nipple with three
conductors can be filled to an area of ____ square
inches. - Answers- 1.224
A 2" conduit no more than ___ in length connecting a
gutter and a switch case may have conductor fill of
60% of the internal cross sectional area. - Answers- 24"
A hoistway in which an elevator is designed to operate
can be all of these except: - Answers- any stairway
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