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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 13

Free practice test 13 for the journeyman electrician exam. Covers circuit breaker types, motor overload, panelboard rules, service entrance sizing, differential relays, and basic electrical theory.

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Frequently Asked Questions

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Most state Journeyman exams have 80–100 questions covering NEC code, wiring methods, branch circuits, motor controls, and load calculations.

Most states require a 70–75% passing score. This practice test uses the same 70% pass threshold so you know where you stand.

Questions are written to the 2023 NEC. Check your state licensing board to confirm which edition your state has adopted.

This test covers breakers, panelboards, and motor behavior. Remember: a 2-pole (double pole) breaker protects 240V circuits. Review NEC 408.36–408.38 (panelboard requirements), NEC 230.31 (service entrance conductors), and NEC 110.19 (trolley wire systems) before you start.

30

Questions

45 min

Time

70%

Pass

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Journeyman Electrician Practice Test 13 — Question List

Question 1: One Horse Power (hp) is equal to ..........

746 watts
766 watts
764 watts

Question 2: Which is the suitable breaker to protect a 240 volt circuit?

Single Pole Breaker
2 Pole (Double Pole) Breaker

Question 3: A 2-Pole Breaker occupies twice as the space of a single pole breaker.

True
False

Question 4: If a motor is connected on 240 Volts electrical circuit, which of the following disconnecting switch is used?

single pole switch
2 -pole switch

Question 5: A Single family house that has a initial computed load of 10 kW or more should have a minimum ..................... amp 120/240 - volt 3-wire service supplied by three wires.

100
30
60
15

Question 6: For a limited load having only one 2-wire branch circuit, what is the acceptable service equipment is required?

A 30 amp Service equipment supplied by two No.12 Copper
A 50 amp Service equipment supplied by two No.12 Copper
A 15 amp Service equipment supplied by two No.12 Copper
A 15 amp Service equipment supplied by two No.12 Aluminum

Question 7: When the motor is overloaded, its .....................

speed drops
speed increases

Question 8: A 100 W fan has a normal frequency of 60 Hz , at 120 Hz supply the power drawn will be:

400 W
200 W
300 W
100 W

Question 9: The branch circuits having rating in excess of ……………………. shall require heavy duty type lamp holders.

20 amperes
35 amperes
45 amperes
15 amperes

NEC Reference: NEC 210.21(A)

Question 10: What is the smallest aluminum wire size allowed for service entrance conductors?

6 AWG
8 AWG
10 AWG
12 AWG

NEC Reference: NEC 230.31(B)

Question 11: Which of the following instrument is used to measure the resistance in the circuit directly?

Ammeter
Volt meter
Watt meter
Ohm meter

Question 12: In which of the following the panel boards must be enclosed?

Cut boxes
Cabinets
All options are correct
Enclosures designed for the purpose

NEC Reference: NEC 408.38

Question 13: Which of the following circuits shall not be connected to system containing trolley wires?

Circuits for lightning
Grounding wires
Ungrounded trolley wires
Bonding wires

NEC Reference: NEC 110.19

Question 14: A Differential relay measures the vector difference between .........................

two voltages
two or more similar electrical quantities
differential of two impedances

Question 15: The corona starting voltage can be increased by:

decreasing the dia of conductors
decreasing the spacing between the conductors
increasing the spacing between conductors and their diameter

Question 16: How does adding a capacitor to an inductive circuit affect the power factor?

It decreases the power factor
It improves (raises) the power factor
It has no effect on power factor
It makes the power factor negative

Question 17: A resistor has a resistance of 10 ohms and carries 5 amperes. How much power does it consume?

50 watts
250 watts
500 watts
2500 watts

Question 18: What is the main function of a motor controller?

Only to protect the motor from overload
To start, stop, and control motor operation
To measure motor current and voltage
Only to convert AC to DC power

NEC Reference: NEC 430.81

Question 19: According to NEC Article 100, what is an "outlet"?

A wall plug or receptacle only
A point on the wiring system where current is taken to supply utilization equipment
The main electrical panel
The service entrance point

NEC Reference: NEC 100

Question 20: According to NEC Article 100, what is a "feeder"?

Conductors from the last pole to the service entrance
Conductors from service equipment to the final branch circuit overcurrent device
Any conductor in a branch circuit
The main service entrance cable only

NEC Reference: NEC 100

Question 21: For the same AWG wire size, which material has higher electrical conductivity (lower resistance)?

Aluminum
Copper
Both are the same
Steel

Question 22: Why is anti-oxidant compound applied to aluminum conductor connections?

To make the wire softer and easier to bend
To prevent corrosive oxide buildup that increases resistance
To improve the color coding of the wire
To increase the wire ampacity

Question 23: A 3-phase 4-wire wye system has a line-to-line voltage of 208V. What is the voltage from any phase to neutral?

208 volts
240 volts
120 volts
277 volts

Question 24: What is the standard phase sequence (rotation) for a 3-phase electrical system in North America?

C-B-A
A-C-B
A-B-C
B-A-C

Question 25: How must an ammeter be connected in a circuit to measure current?

In parallel with the load
In series with the load
Across the power source terminals
At the service entrance only

Question 26: How must a voltmeter be connected in a circuit to measure voltage?

In series with the load
In parallel (across) the load
At the service panel only
Between the hot and ground conductors only

Question 27: What does a wattmeter measure in an AC circuit?

Apparent power in volt-amperes (VA)
True (real) power in watts
Reactive power in VAR
Electrical energy in kilowatt-hours

Question 28: Service entrance conductors must have an ampacity of not less than .............

125% of the computed load
The load to be served (computed per Article 220)
80% of the computed load
The rating of the largest branch circuit only

NEC Reference: NEC 230.42(A)

Question 29: What instrument is used to test the insulation resistance of a conductor or motor winding?

A standard ohmmeter
A voltmeter
A megohmmeter (megger)
A clamp-on ammeter

Question 30: What is the advantage of a clamp-on ammeter over a standard ammeter?

It is more accurate than a standard ammeter
It can measure current without breaking the circuit
It measures both AC and DC with no difference
It does not need batteries to operate

Key NEC References for This Test

Article	What It Covers
Art. 100	Definitions — know: feeder, branch circuit, OCPD, dwelling unit
Art. 210	Branch Circuits — GFCI/AFCI locations, circuit ratings, outlet spacing (most tested)
Art. 220	Load Calculations — dwelling unit standard method
Art. 250	Grounding & Bonding — GEC sizing, electrode system, EGC
Art. 310	Conductors — ampacity (Table 310.12), insulation, derate rules
Art. 430	Motors — conductor 125% FLA, OCPD 250% FLA, overloads, disconnects

Study Tip: Tab Articles 210, 250, and 430 in your NEC before the exam. Know the Table 310.12 ampacity values for 14, 12, 10, 8, 6, and 4 AWG copper.

EXAM CARD JOURNEYMAN

Questions30

Time limit45 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)