Free AL-JE Practice Questions

Question 1

A 240 V condensing unit is marked minimum circuit ampacity (MCA) 28 A and maximum circuit breaker 40 A. Its 10 AWG copper THWN-2 conductors have 35 A usable ampacity after termination limits and all applicable corrections. The listed 40 A breaker starts the unit reliably. Which assessment of this installation is correct?

Accepted Answer

The conductors and breaker satisfy their separate nameplate requirements; neither must be changed.

Answer

The conductors must be increased to 8 AWG because the breaker exceeds their 35 A ampacity.

Answer

The breaker must be reduced to 35 A because usable conductor ampacity always limits its ampere rating.

Answer

The breaker must be reduced to 30 A because the general 10 AWG copper limit overrides the HVAC marking.

Question 2

While checking an operating 120 V heater, a journeyman closes an AC clamp meter around both the hot and neutral conductors together. It reads approximately zero, although the heater continues producing heat. The same meter reads normally around a single conductor on another loaded circuit. How should the zero reading be interpreted?

Accepted Answer

The opposing currents cancel in the clamp; measure one conductor to obtain load current.

Answer

The heater has developed an internal open circuit; remove it from service before further testing.

Answer

The neutral carries no current; its termination should be checked for an open connection.

Answer

The meter needs the equipment grounding conductor inside its jaws to measure the complete circuit.

Question 3

Three two-wire, 240 V circuits share a 75 ft EMT run. Each circuit has two 8 AWG copper THHN conductors and one equipment grounding conductor; there are no neutrals. Ambient temperature is 40°C and all power terminals are rated 75°C. Table 310.16 gives 8 AWG copper ampacities of 50 A at 75°C and 55 A at 90°C. The 90°C ambient correction factor is 0.91; adjustment factors are 0.80 for 4-6 current-carrying conductors and 0.70 for 7-9. What is each 8 AWG conductor's allowable ampacity, to the nearest tenth of an ampere?

Accepted Answer

40.0 A

Answer

35.0 A

Answer

44.0 A

Answer

50.0 A

Question 4

A new 120/240 V feeder supplies a detached workshop through PVC conduit with two ungrounded conductors, an insulated neutral, and a wire-type equipment grounding conductor. The workshop's grounding electrodes and feeder equipment grounding conductor connect to a grounding bar bonded to the panel enclosure. Inspection finds the panel's neutral bonding screw installed, and ordinary load current is flowing on the feeder equipment grounding conductor. After safe isolation, what correction addresses this defect?

Accepted Answer

Remove the neutral bonding screw while retaining the enclosure's equipment-grounding connection.

Answer

Keep the neutral bonding screw and add a larger conductor between the panel and its ground rods.

Answer

Disconnect the feeder equipment grounding conductor while retaining the panel's neutral bonding screw.

Answer

Disconnect the grounding electrode conductor while retaining the neutral-to-enclosure connection.

Question 5

A new dwelling kitchen has a dedicated 120 V, 20 A branch circuit supplying only a refrigerator receptacle, 9 ft from the sink. The receptacle does not serve a countertop. For this circuit, the 2023 NEC requires which protection in addition to ordinary overcurrent protection?

Accepted Answer

Both GFCI and AFCI protection

Answer

GFCI protection without AFCI protection

Answer

AFCI protection without GFCI protection

Answer

Neither; ordinary overcurrent protection is sufficient

Question 6

A three-wire motor starter runs the motor while START is held but drops out immediately when START is released. The normally closed STOP and overload contacts have been verified closed, and the contactor coil receives its rated voltage while START is held. A normally open auxiliary contact is wired across START. Which fault best fits these observations?

Accepted Answer

An open auxiliary holding-contact circuit

Answer

Main power contacts welded closed in the contactor

Answer

An overload contact stuck open in the coil circuit

Answer

A START pushbutton contact welded closed

Question 7

A box receives three 12/2 cables with grounds. All six insulated 12 AWG conductors are spliced or terminated inside. The box also contains the three 12 AWG equipment grounding conductors, internal cable clamps, and one duplex receptacle on a single yoke. Two 12 AWG insulated pigtails remain entirely inside the box. There are no other fittings or devices. Using 2.25 cubic inches per 12 AWG allowance, what minimum box volume does the 2023 NEC require?

Accepted Answer

22.50 cubic inches

Answer

18.00 cubic inches

Answer

20.25 cubic inches

Answer

27.00 cubic inches

Question 8

During a tenant renovation, a convenience receptacle is added to the 120 V branch circuit supplying a power-limited fire-alarm control unit. The control unit's backup batteries remain functional. Its breaker already has the required identification and labeling. What must change to satisfy the NEC fire-alarm power-supply rule?

Accepted Answer

The convenience receptacle must be moved to another branch circuit.

Answer

Increase backup-battery capacity for the existing shared-supply arrangement.

Answer

Mark the convenience receptacle FIRE ALARM CIRCUIT and leave it connected.

Answer

Add GFCI protection to the shared circuit without moving the receptacle.

Question 9

At a commercial service identified as 240/120 V, three-phase, four-wire delta, a qualified electrician records 240 V between every pair of phases. Measurements to neutral are A-N 120 V, B-N 208 V, and C-N 120 V. A new control requires a 120 V line-to-neutral supply. Which response correctly uses these findings?

Accepted Answer

Use A-N or C-N for the control; B-N is the expected high-leg voltage.

Answer

Use any phase pair for the control; these readings identify a 208Y/120 V system.

Answer

Have the utility repair the service before using it; B-N should also measure 120 V.

Answer

Interchange two incoming phases to eliminate the 208 V phase-to-neutral reading.

Question 10

Before replacing a 480 V starter, a qualified electrician isolates and locks out all identified sources. An appropriately rated contact voltage tester responds correctly on a known live source, then reads zero on every required conductor-to-conductor and conductor-to-ground check at the starter. When rechecked on an independently confirmed live source, the tester now reads zero. What does this mean for permission to touch the conductors?

Accepted Answer

Absence of voltage is unproven; repeat the complete verification with a functioning tester.

Answer

The initial live check validates the zero readings; the locked-out conductors may be touched.

Answer

A noncontact detector showing no voltage can substitute for repeating the contact-voltage tests.

Answer

Once the tester works on the live source again, the earlier zero readings can be accepted.

Free AL-JE Practice Questions

Domain 1: Conductors and Cables

Question 1

Domain 2: Electrical Power

Question 2

Domain 3: Fire Detection and Alarm Systems

Question 3

Domain 4: General Electrical Knowledge

Question 4

Domain 5: Grounding and Bonding

Question 5

Domain 9: Motors

Question 6

Domain 11: Raceways and Boxes

Question 7

Domain 12: Safety Information

Question 8

Domain 13: Service, Feeders, and Branch Circuits

Question 9

Domain 14: Special Occupancies and Equipment

Question 10

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