IEC FIRST YEAR EXAM STUDY
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) ___. - ✔✔✔✔is 1.2 kW
, - ✔✔✔✔
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. -
✔✔✔✔a. time duration of the fault
Article ___ in the NEC ® covers grounding and bonding of electrical systems. -
✔✔✔✔250
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) ___. - ✔✔✔✔is 1.2 kW
, - ✔✔✔✔
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. -
✔✔✔✔a. time duration of the fault
Article ___ in the NEC ® covers grounding and bonding of electrical systems. -
✔✔✔✔250
