IEC First Year Exam Study Questions And Answers Latest Top Score.
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IEC
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IEC
IEC First Year Exam Study Questions And Answers Latest Top Score.
What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads? - correct answer. The load of higher resistance would overheat and probably be damaged.
The Code reference that specifi...
IEC First Year Exam Study Questions And
Answers Latest Top Score.
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads? - correct answer. 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 ___. - correct
answer. 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. - correct answer. 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? - correct answer.
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) ___. - correct answer. is 1.2 kW
- correct answer.
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 ___. - correct answer. 24 in.
An extension ladder should extend ___ feet above the top of the building and be
secured. - correct answer. 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. - correct answer. $9.00
___ can be described as the point of demarcation between where the serving utility
ends and the premises wiring begins. - correct answer. Service Point
If a 60-watt lamp operates for 21 hours, the utility will bill for ___ kWh. - correct answer.
1.260
To minimize conductor insulation damage and arcing damage to electrical equipment
during a ground fault or a short circuit, ___ should be minimized. - correct answer. a.
time duration of the fault
Article ___ in the NEC ® covers grounding and bonding of electrical systems. - correct
answer. 250
Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the
equipment grounding conductor to a metal box. - correct answer. are not
For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN
conductors are the smallest permitted for the ungrounded conductors. - correct answer.
3
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. - correct answer. larger
Which of the following is a 3/0 AWG conductor? - correct answer. 000
When calculating the size of the required service, you should consult household electric
clothes dryer demand factors given in Table ___. - correct answer. 220.54
The Standard for Electrical Safety in the Workplace requires that all electrical equipment
operating at over ___ volts to ground be de-energized and locked out before anyone is
permitted to work on or near the equipment. - correct answer. 50
Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. - correct
answer. true
Article ___ of the NEC ® is the article that gives requirements for swimming pool
installations. - correct answer. 680
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