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IEC year 2 final review Questions and Answers Fully Solved
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IEC year 2 final reviewRefer 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. - answer15
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. - answer70
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. - 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. - answer6.09
Refer to Figure 221.404. The voltage applied to Heating Element B is ___ volts. -
answer138.6
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. - answerB32
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? - answer8
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. - answer18.6
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? - answerAn 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. - answer16.0
The service disconnecting means for a 3-phase service is permitted to consist of ___. -
answerany 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. - answer100
The classification of a location, where ignitable concentrations of flammable liquid-
produced vapors or combustible liquid-produced vapors exist under normal operating
conditions, is ___. - answerClass 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? - answer7,800
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. - answer1
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. - answer8.25
A set of wires (black, red, blue and green) are installed between a 3-pole safety switch
and a 3Ø motor. The direction of rotation of the motor can be changed by swapping the
___ wire connections on the load side of the switch. - answerblack and blue
___ is permitted to be installed in a concrete floor slab.
I. Schedule 40 PVC
II. FMC
III. aluminum MC cable - answerI only
A(n) ___ refrigerant motor-compressor is a combination compressor and motor in the
same housing, having no external shaft or shaft seals, with the motor operating in the
refrigerant. - answerhermetic
In a 60 Hz circuit, containing a 1.3 mh inductor, the inductive reactance is ___ ohms. -
answer.49
___ is the measure of a circuit's ability to store an electrical charge. -
answerCapacitance
A sine wave will hit its peak value ___ time(s) during each cycle. - answer2
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