IEC FINAL EXAM YEAR 1, 2, 3 AND 4 EXAMS |
ALL QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | LATEST VERSION |
VERIFIED ANSWERS
IEC FINAL EXAM YEAR 1
How much current is flowing in the neutral conductor at in Figure 128.209?
a.4
b.2
c.0
d.5
e.none of these ------CORRECT ANSWER---------------b. 2
The neutral has been broken in the circuit shown in Figure 128.418. The
current through Lamp F (IF) with the neutral opened is ___ amps.
,A copier is connected to circuit LA-1. A microwave is connected to circuit
LA-3. These two circuits share a neutral. The copier should draw 13.2
amps at 120 volts. The microwave is rated to use 1,800 watts at 120 volts.
Circuits LA-1 and LA-3 originate in a 120/240-volt, 1Ø, 3-wire panelboard. If
the neutral is disconnected from the neutral bar while the equipment is
operating, there will be ___ volts applied to the microwave.
Both the schematic (near right) and the pictorial drawing (far right) are
shown. The fixed resistance of EACH of the four elements in the furnace is
40 ohms.
Refer to Figure 129.104. If the leads of a voltmeter are placed at T3 and
T4, the meter will indicate ___ volts.
a.0
b.480
c.120
d.240
e.none of these ------CORRECT ANSWER---------------c. 120 Volts
For a 125-Amp, 120/240-V, 3W residential service, ___ AWG copper
THHN/THWN conductors are the smallest permitted for the ungrounded
conductors.
a.1
b.4
c.3
d.2
e.none of these ------CORRECT ANSWER---------------d. 2
, NEC Table 310.12
Loads, such as heating and air conditioning, that do not operate at the
same time are said to be noncoincident loads. While separate circuits must
be designed to serve each load, when calculating service load only the ___
of two noncoincident loads needs to be included.
What is the result if the neutral wire becomes open on a multiwire circuit
having unequal loads?
a.
The load of higher resistance would overheat and probably be damaged.
b.
The load of lesser resistance would overheat and probably be damaged.
c.
No effect until one load is turned off or opens.
d.
No effect. ------CORRECT ANSWER---------------a.
The load of higher resistance would overheat and probably be damaged.
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