California General Electrician practice quiz

Question 1

An electrician is running wiring through a commercial hallway ceiling with exposed pendant lighting. Which raceway is the most practical choice for this exposed application?

Accepted Answer

EMT (Electrical Metallic Tubing)

Answer

PVC Schedule 80

Answer

NM-B (Nonmetallic Cable)

Answer

MC Cable with steel armor

Question 2

A new residential service is being installed. What is the minimum size copper grounding electrode conductor required for a 200-amp service?

Accepted Answer

4 AWG

Answer

6 AWG

Answer

2 AWG

Answer

1/0 AWG

Question 3

During rough-in inspection, an inspector checks a box holding six 12 AWG insulated conductors, two 12 AWG pigtails that stay inside the box, internal cable clamps and one receptacle. What is the minimum box volume required?

Accepted Answer

20.25 in³

Answer

15.75 in³

Answer

18.0 in³

Answer

24.75 in³

Question 4

A 40-amp, 240-volt branch circuit feeds a wall oven. What is the minimum conductor size for copper conductors with 75°C insulation?

Accepted Answer

8 AWG

Answer

4 AWG

Answer

6 AWG

Answer

10 AWG

Question 5

A kitchen dishwasher is connected to a dedicated branch circuit. The manufacturer specifies a 15-amp breaker. Can the electrician install a 20-amp overcurrent device instead?

Accepted Answer

No, the manufacturer's listed overcurrent protection must be followed

Answer

Yes, if the wiring is rated for 20 amps

Answer

Yes, as long as the circuit is not shared

Answer

Yes, because 20-amp breakers are the kitchen circuit minimum

Question 6

A 5-horsepower, 230-volt, single-phase pool pump motor has a Table 430.248 full-load current of 28 amps. What is the minimum size copper THWN branch-circuit conductor (75°C terminations)?

Accepted Answer

10 AWG

Answer

6 AWG

Answer

8 AWG

Answer

4 AWG

Question 7

A dwelling unit has a 240-volt, 12-kW electric range. Using the standard calculation method, what is the demand load for the range?

Accepted Answer

8.0 kW

Answer

12.0 kW

Answer

9.6 kW

Answer

10.0 kW

Question 8

A small commercial office has 120 general-use receptacles at 180 VA each, 40 fluorescent luminaires at 150 VA each, and one 208V, 3-phase air-conditioning unit with a nameplate of 7,000 VA. What is the calculated service load using the standard method?

Accepted Answer

28.8 kVA

Answer

21.6 kVA

Answer

31.2 kVA

Answer

34.8 kVA

Question 9

A 100-amp subpanel is located 300 feet from the main panel. The load is 80 amps at 240 volts single-phase. Using 2/0 AWG copper conductors, what is the approximate voltage drop?

Accepted Answer

1.9%

Answer

2.5%

Answer

3.2%

Answer

4.8%

Question 10

Before servicing a 480-volt industrial motor starter, what must an electrician perform to ensure a safe working condition?

Accepted Answer

Wear rubber gloves and begin working immediately

Answer

Tag the disconnect and proceed with testing

Answer

Verify the motor is off using a non-contact voltage tester only

Answer

Lock out and tag out the energy source per NFPA 70E procedures

Question 11

An electrician is troubleshooting a circuit that trips intermittently. The multimeter shows normal voltage at the panel but the breaker trips under light load. What tool would best identify the fault?

Accepted Answer

Megohmmeter

Answer

Clamp-on ammeter

Answer

Non-contact voltage detector

Answer

Infrared camera

Question 12

NM-B cable is being installed in a new single-family home. In which of the following locations is NM-B prohibited?

Accepted Answer

Below a concrete slab-on-grade foundation

Answer

Attic spaces above insulated ceilings

Answer

Inside finished walls of living rooms

Answer

Through bored holes in wood framing members

Question 13

A metallic water pipe enters a building and is bonded to the grounding system. How far from the building entrance must the bonding connection be made to the water pipe?

Accepted Answer

Within 5 feet of the pipe's entry into the building

Answer

At the main service disconnect only

Answer

Within 10 feet of the pipe's entry into the building

Answer

Within 18 inches of the water meter

Question 14

An electrician needs to pull four 10 AWG THHN conductors through a 3/4-inch EMT raceway. Is this installation permitted?

Accepted Answer

Yes, because 3/4-inch EMT has sufficient fill for four 10 AWG conductors

Answer

No, because 10 AWG requires a minimum of 1-inch conduit

Answer

No, because 3/4-inch EMT only allows three 10 AWG conductors at 40% fill

Answer

Yes, but only if the conductors are nylon-jacketed

Question 15

A feeder serves a 200-amp subpanel. The conductors are copper with 75°C insulation and terminate on equipment rated for 75°C. What is the minimum conductor size?

Accepted Answer

3/0 AWG

Answer

2 AWG

Answer

1/0 AWG

Answer

2/0 AWG

Question 16

A 100-amp fused disconnect protects a heat pump. The equipment label specifies a maximum fuse size of 60 amps. Can the electrician install 60-amp fuses in a 100-amp rated disconnect?

Accepted Answer

Yes, the overcurrent device must not exceed the equipment's listed rating

Answer

No, the fuse must match the disconnect rating

Answer

Yes, but only with time-delay fuses

Answer

No, fuses must always match the disconnect amperage

Question 17

A 10-horsepower, 230-volt, 3-phase motor has a Table 430.250 full-load current of 28 amps. What is the maximum rating of an inverse-time circuit breaker for motor branch-circuit short-circuit and ground-fault protection?

Accepted Answer

70 amps

Answer

45 amps

Answer

50 amps

Answer

60 amps

Question 18

A dwelling has four 120V, 20-amp branch circuits for general lighting. Using the optional calculation method, what is the demand load for the general lighting in VA?

Accepted Answer

9,600 VA

Answer

7,200 VA

Answer

3,840 VA

Answer

4,800 VA

Question 19

A 2,000-square-foot dwelling has two 240V, 40A electric clothes dryers. What is the demand load for the dryers using the standard calculation?

Accepted Answer

10.0 kW

Answer

12.0 kW

Answer

5.0 kW

Answer

8.0 kW

Question 20

A sign installer needs to run a 240V, 20-amp circuit 300 feet to a rooftop sign. Using 8 AWG copper THHN, what is the voltage drop at full load?

Accepted Answer

9.6 volts (4.0%)

Answer

4.8 volts (2.0%)

Answer

7.2 volts (3.0%)

Answer

12.0 volts (5.0%)