IEC YEAR 2 FINAL REVIEW QUESTIONS WITH CORRECT VERRIFIED ANSWERS
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Course
IEC
Institution
IEC
Refer to the information shown in Figure 234.151. When the tap for Motor 3 terminates in a safety switch, the maximum permitted size for DETD fuses in this switch would be _____ A. - Correct Answer 15
Refer to the information shown in Figure 234.151. When the tap for Motor 1 terminates in a br...
IEC YEAR 2 FINAL REVIEW QUESTIONS WITH
CORRECT VERRIFIED ANSWERS
Refer to the information shown in Figure 234.151. When the tap for Motor 3 terminates in a safety
switch, the maximum permitted size for DETD fuses in this switch would be _____ A. - Correct Answer
15
Refer to the information shown in Figure 234.151. When the tap for Motor 1 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclosure would be ____ A. - Correct Answer
70
Refer to the information shown in Figure 234.151. When th etap for Motor 3 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclose would be ____ A. - Correct Answer
none of these
Voltage Drop Scenario #3
The distance between the panel and a load is 150 feet. The circuit to the load consists of two 12 AWG
solid copper coated conductors that are connected to a 1-pole breaker in a 277/480-volt, 3Ø, 4-wire
panel and the neutral bar. The load draws 9.8 amps.
Refer to Voltage Drop Scenario #3. If the voltage drop is to be limited to 2.2%, this is ___ volts. - Correct
Answer 6.09
Refer to Figure 221.404. The voltage applied to Heating Element B is ___ volts. - Correct Answer 138.6
Refer to the nameplate and heater selection table, shown above in Figure 230.122. For a correctly sized
starter, the heater catalog number for the heaters is ___. This motor is supplied power from a 120/240-
volt, 3-phase, 4-wire panelboard. - Correct Answer B32
Refer to the nameplate shown in Figure 230.122. The branch circuit for the motor is supplied from a
240/120-volt, 3Ø, 4-wire panelboard. What is the minimum size (3 wire + ground) SO cord that could be
used as a flexible connection for the motor? - Correct Answer 8
, Refer to the nameplate shown in Figure 230.122. This motor should draw ___ amps at rated voltage
when connected to Circuit 4-6-8 that is fed from a 3-pole breaker in a 120/240-volt, 3Ø, 4-wire
panelboard. - Correct Answer 18.6
Two lighting circuits are supplied from a multiwire branch circuit that originates in a 120/240 volt, 1Ø, 3-
wire panelboard. Two, 20 Amp, 1-pole breakers are installed in spaces 22 & 24 for the multiwire circuit.
Circuit 22 has 2600 watts of lights connected to it, and Circuit 24 has 2100 watts of lights connected to it.
Which of the following should happen to Circuit 22? - Correct Answer An overload will occur and the
breaker will trip.
Refer to Figure 221.402. If Ammeter 2 indicates 38.5 amps, the generator is delivering ___ kW of power. -
Correct Answer 16.0
The service disconnecting means for a 3-phase service is permitted to consist of ___. - Correct Answer
any of the above
Nontime-delay fuses are to be installed in a safety switch adjacent to a motor. See Figure 230.225. Fuses
with a rating not exceeding ___ A are permitted. - Correct Answer 100
The classification of a location, where ignitable concentrations of flammable liquid-produced vapors or
combustible liquid-produced vapors exist under normal operating conditions, is ___. - Correct Answer
Class I, Division 1
If a 4-wire, wye-connected supply system has a line-to-line voltage of 13.5 kV, what is the line-to-neutral
voltage? - Correct Answer 7,800
Refer to the motor nameplate shown in Figure 230.108. A NEMA starter will be used for this motor. The
fewest number of heaters that can be installed in the starter per the NEC ® is ___. The motor circuit is
supplied from a 2-pole breaker in a 120/240-volt, 3Ø, 4-W panel. - Correct Answer 1
A transformer has a primary rated voltage of 120 and a secondary rated voltage of 16. If the current in
the circuit conductors connected to the primary is 1.1 amps, the load that is connected to the secondary
must be drawing ___ amps. - Correct Answer 8.25
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