IEC YEAR 2 FINAL UPDATED ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS
◉ 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.
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.
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.
Answer: 6.09
,◉ Refer to Figure 221.404. The voltage applied to Heating Element B
is ___ volts.
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.
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?
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.
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?
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.
Answer: 16.0
◉ The service disconnecting means for a 3-phase service is
permitted to consist of ___.
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.
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 ___.
Answer: Class I, Division 1
QUESTIONS AND CORRECT ANSWERS
◉ 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.
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.
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.
Answer: 6.09
,◉ Refer to Figure 221.404. The voltage applied to Heating Element B
is ___ volts.
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.
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?
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.
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?
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.
Answer: 16.0
◉ The service disconnecting means for a 3-phase service is
permitted to consist of ___.
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.
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 ___.
Answer: Class I, Division 1
