LADWP ELECTRICAL CRAFT HELPER EXAM
CLASS-3799 WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1.
Before an Electrical Craft Helper begins assisting with maintenance on a
motor that is believed to be de-energized, which procedure provides the
most reliable protection against unexpected energization?
A. Turn the disconnect off and immediately begin work
B. Notify nearby employees that the motor is off
C. Open the disconnect, apply the required lockout/tagout controls, and
verify absence of voltage using an appropriate test procedure
D. Ask another employee whether the motor is normally energized
Answer: C. Open the disconnect, apply the required lockout/tagout
controls, and verify absence of voltage using an appropriate test
procedure
Rationale: Lockout/tagout controls prevent unauthorized re-
energization, while verification establishes that the circuit is actually
de-energized. Merely switching a disconnect off or notifying coworkers
does not adequately protect a worker from unexpected energization.
2.
1
,An electrical circuit has a resistance of 12 ohms and is connected to a
120-volt source. Using Ohm's law, approximately how much current
should flow?
A. 0.1 A
B. 10 A
C. 120 A
D. 1,440 A
Answer: B. 10 A
Rationale: Ohm's law states I = V/R. Therefore, 120 volts ÷ 12 ohms =
10 amperes. Understanding this relationship helps a helper recognize
whether measured current is reasonable for a circuit.
3.
Which instrument is specifically intended to measure electrical current
in a circuit?
A. Ammeter
B. Voltmeter
C. Megohmmeter
D. Ohmmeter
Answer: A. Ammeter
Rationale: An ammeter measures current, normally in amperes. A
voltmeter measures potential difference, an ohmmeter measures
resistance, and a megohmmeter is commonly used to assess insulation
resistance.
4.
2
,A helper is instructed to assist with determining whether two conductors
form a continuous electrical path. Which measurement is most directly
relevant?
A. Frequency
B. Voltage drop
C. Power factor
D. Continuity/resistance
Answer: D. Continuity/resistance
Rationale: A continuity test determines whether a conductive path
exists between two points. In practice, continuity testing is normally
performed on a properly isolated and de-energized circuit using an
appropriate meter or tester.
5.
Which tool is most appropriate for cutting a small-gauge electrical wire
cleanly?
A. Pipe wrench
B. Diagonal-cutting pliers
C. Adjustable wrench
D. Ball-peen hammer
Answer: B. Diagonal-cutting pliers
Rationale: Diagonal-cutting pliers are designed for cutting wire and
small conductors. Using an inappropriate tool can damage the
conductor, tool, or surrounding equipment and can create a safety
hazard.
6.
3
, Why should slip-joint pliers generally not be used to tighten or loosen a
precision hexagonal nut?
A. They cannot grip metal
B. They are intended only for electrical testing
C. Their jaws can slip and damage or deform the nut
D. They generate excessive electrical current
Answer: C. Their jaws can slip and damage or deform the nut
Rationale: Slip-joint pliers are versatile gripping tools but do not
provide the controlled fit of a properly sized wrench. Their jaws can
mar rounded surfaces and cause slipping, especially when significant
torque is required.
7.
An Electrical Craft Helper is asked to install conduit through a metal
enclosure. After cutting the conduit, the inside edge is sharp. What
should be done before conductors are pulled through?
A. Paint over the sharp edge
B. Use a suitable reaming tool to remove the burr
C. Strike the edge with a hammer until it bends inward
D. Pull the conductors through rapidly
Answer: B. Use a suitable reaming tool to remove the burr
Rationale: Cutting conduit can leave sharp burrs capable of damaging
conductor insulation. Reaming removes those sharp edges and helps
protect conductors during installation.
8.
4
CLASS-3799 WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1.
Before an Electrical Craft Helper begins assisting with maintenance on a
motor that is believed to be de-energized, which procedure provides the
most reliable protection against unexpected energization?
A. Turn the disconnect off and immediately begin work
B. Notify nearby employees that the motor is off
C. Open the disconnect, apply the required lockout/tagout controls, and
verify absence of voltage using an appropriate test procedure
D. Ask another employee whether the motor is normally energized
Answer: C. Open the disconnect, apply the required lockout/tagout
controls, and verify absence of voltage using an appropriate test
procedure
Rationale: Lockout/tagout controls prevent unauthorized re-
energization, while verification establishes that the circuit is actually
de-energized. Merely switching a disconnect off or notifying coworkers
does not adequately protect a worker from unexpected energization.
2.
1
,An electrical circuit has a resistance of 12 ohms and is connected to a
120-volt source. Using Ohm's law, approximately how much current
should flow?
A. 0.1 A
B. 10 A
C. 120 A
D. 1,440 A
Answer: B. 10 A
Rationale: Ohm's law states I = V/R. Therefore, 120 volts ÷ 12 ohms =
10 amperes. Understanding this relationship helps a helper recognize
whether measured current is reasonable for a circuit.
3.
Which instrument is specifically intended to measure electrical current
in a circuit?
A. Ammeter
B. Voltmeter
C. Megohmmeter
D. Ohmmeter
Answer: A. Ammeter
Rationale: An ammeter measures current, normally in amperes. A
voltmeter measures potential difference, an ohmmeter measures
resistance, and a megohmmeter is commonly used to assess insulation
resistance.
4.
2
,A helper is instructed to assist with determining whether two conductors
form a continuous electrical path. Which measurement is most directly
relevant?
A. Frequency
B. Voltage drop
C. Power factor
D. Continuity/resistance
Answer: D. Continuity/resistance
Rationale: A continuity test determines whether a conductive path
exists between two points. In practice, continuity testing is normally
performed on a properly isolated and de-energized circuit using an
appropriate meter or tester.
5.
Which tool is most appropriate for cutting a small-gauge electrical wire
cleanly?
A. Pipe wrench
B. Diagonal-cutting pliers
C. Adjustable wrench
D. Ball-peen hammer
Answer: B. Diagonal-cutting pliers
Rationale: Diagonal-cutting pliers are designed for cutting wire and
small conductors. Using an inappropriate tool can damage the
conductor, tool, or surrounding equipment and can create a safety
hazard.
6.
3
, Why should slip-joint pliers generally not be used to tighten or loosen a
precision hexagonal nut?
A. They cannot grip metal
B. They are intended only for electrical testing
C. Their jaws can slip and damage or deform the nut
D. They generate excessive electrical current
Answer: C. Their jaws can slip and damage or deform the nut
Rationale: Slip-joint pliers are versatile gripping tools but do not
provide the controlled fit of a properly sized wrench. Their jaws can
mar rounded surfaces and cause slipping, especially when significant
torque is required.
7.
An Electrical Craft Helper is asked to install conduit through a metal
enclosure. After cutting the conduit, the inside edge is sharp. What
should be done before conductors are pulled through?
A. Paint over the sharp edge
B. Use a suitable reaming tool to remove the burr
C. Strike the edge with a hammer until it bends inward
D. Pull the conductors through rapidly
Answer: B. Use a suitable reaming tool to remove the burr
Rationale: Cutting conduit can leave sharp burrs capable of damaging
conductor insulation. Reaming removes those sharp edges and helps
protect conductors during installation.
8.
4
