FREE Journeyman Electrician’s MCQ Questions and Answers

Question 1

Which of the following is true when Type NM cables are allowed to pass through a non-flexible raceway into a panelboard without being fastened to the panelboard?

Accepted Answer

The raceway extends directly above the enclosure without penetrating the structural
ceiling.

Answer

The number of cables installed in the raceway is not limited where the raceway length is not more than 24-inches.

Answer

The cables must be strapped within 24 inches, measured along the cable sheath, of the outer end of the raceway because they are not fastened to the enclosure with a fitting.

Answer

The raceway shall be at least 18-inches, but not more than 10 ft in length.

Question 2

Which of the following four statements about the installation of receptacle outlets placed to serve countertop surfaces in the kitchen of a dwelling unit located in a multifamily home DOES NOT accurately express the code requirements?

Accepted Answer

Only receptacle outlets installed within 6-inches of the outside edge of the sink(s) shall be required to be provided with ground-fault circuit-interrupter protection for personnel.

Answer

A receptacle outlet shall be installed at each wall counter space that is 12-inches or wider

Answer

The required receptacle outlets shall be supplied by not less than two small-appliance branch circuits

Answer

If located above, the receptacle outlets shall not be located more than 20-inches above the counter top.

Question 3

Three Design B, 460-volt, three-phase, 1740 RPM alternating-current motors are supplied by a feeder. The motors' nameplate ratings are as follows: 15 horsepower, 18.2 amperes, 10.3 amperes, and 25 horsepower are the different power outputs. What size XHHW-2 copper feeder circuit wires are necessary to supply the motor load if all the motors are functioning continuously? The 75°C rating applies to the conductor terminations.

Accepted Answer

4 AWG

Answer

2 AWG

Answer

3 AWG

Answer

6 AWG

Question 4

How should a single equipment grounding conductor be scaled when it is connected to many branch circuits in the same raceway or cable?

Accepted Answer

The equipment grounding conductor shall be sized for the largest overcurrent device protecting the conductors in the raceway or cable.

Answer

The equipment grounding conductor shall be sized for the sum of all the overcurrent devices protecting the conductors in the raceway or cable.

Answer

The equipment grounding conductor shall be sized for the average rating of all the overcurrent devices protecting the conductors in the raceway or cable.

Answer

The equipment grounding conductor shall not be smaller than 10 AWG.

Question 5

What is a transformer's maximum short-circuit fault current when the secondary nameplate rating is 75 kva, 120/240 volts, single-phase, and 2.5% Z?

Accepted Answer

312.5 (transformer full-load amperes) x 40 (multiplier) = 12,500 short-circuit fault current

Answer

The maximum available short-circuit fault current:

Answer

The multiplier is 100 ÷ 2.5% = 40

Answer

The transformer full-load ampere rating is 75000 ÷ 240 = 312.5

Question 6

What is a transformer's maximum short-circuit fault current when the secondary nameplate rating is 45 kva, 120/208 volts, three phases, and 1.2% Z?

Accepted Answer

125 (transformer full-load amperes) x 83.33 (multiplier) = 10416 (short-circuit fault current)

Answer

The transformer full-load ampere rating is 45000 ÷ (208 x 1.732) = 125

Answer

The multiplier is 100 ÷ 1.2 = 83.33

Answer

The maximum available short-circuit fault current:

Question 7

What is the maximum ampacity that a No. 1/0 THWN copper conductor can handle when installed in 107° F of ambient temperature?

Accepted Answer

150 x .82 = 123 amperes

Answer

NEC Table 310.16 lists the allowable ampacity of No.1/0 THWN copper, a 75°C rated conductor as 150 amperes

Answer

The correction factor is .82

Question 8

The following places are not permitted to utilize flexible cards:

Accepted Answer

To replace a fixed wiring of a structure

Answer

Ground fault circuit interceptor

Answer

4 AWG is the minimum size wire for a 300 ampere circuit

Answer

yes, to prevent unwanted gases entry in buildings

Question 9

What is the sinusoidal AC low voltage contact limit?

Accepted Answer

15 Volts RMS

Answer

180 ohms

Answer

1/ 8 horse power

Answer

87 1/2 %

Question 10

What kind of substance shouldn't be utilized for grounding electrodes.

Accepted Answer

Aluminum

Answer

Iron

Answer

Copper

Answer

Steel