IEC First Year Exam Study Questions and Correct Answers the Latest Update and Recommended Version
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Course
IEC
Institution
IEC
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads?
→ The load of higher resistance would overheat and probably be damaged.
The Code reference that specifies the type of disconnecting means (circuit breaker for
example) that can be used on a mult...
IEC First Year Exam Study Questions and
Correct Answers the Latest Update and
Recommended Version
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads?
→ The load of higher resistance would overheat and probably be damaged.
The Code reference that specifies the type of disconnecting means (circuit breaker for
example) that can be used on a multiwire branch circuit that feeds devices mounted on the
same yoke [a stack switch or a duplex receptacle for example] is ___.
→ 240.15(B)(1)
Refer to the panel schedule shown in Figure 128.231. If the neutral is removed from the
neutral bar, ___ volts will be applied to the TV.
→ 150
A 12/3 cable is installed from a 120/240-V, 1Ø panel and feeds a split-wired duplex
receptacle. One "hot" is connected to a 20A breaker in panel space 1. The second "hot" is
connected to a 20A breaker in space 3. A 16-amp load is connected to the upper receptacle
and a 14-amp load is connected to the lower receptacle. Which of the following will happen
if the neutral is removed from the receptacle?
→ Because a higher voltage will be applied, 120-volt equipment could be destroyed.
Refer to Figure 129.106. With the equipment energized and the power used by the element
connected at T3 & T4 is 0.3kW, the power used by the equipment (all 4 elements) ___.
A short length of EMT is run between two panels. The ampacity values for the conductors in this
EMT need not be derated, as long as the length of the EMT does not exceed ___.
→ 24 in.
An extension ladder should extend ___ feet above the top of the building and be secured.
→ 3ft.
What is the monthly energy cost to operate a 250-watt high-pressure sodium lamp? Electricity
costs $0.15 per kW-hr and the lamp will be ON for 8 hours per day. There are 30 days in a
billing month.
→ $9.00
___ can be described as the point of demarcation between where the serving utility ends and
the premises wiring begins.
→ Service Point
If a 60-watt lamp operates for 21 hours, the utility will bill for ___ kWh.
→ 1.260
To minimize conductor insulation damage and arcing damage to electrical equipment during a
ground fault or a short circuit, ___ should be minimized.
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