1|Page
LADWP Electrical Craft Helper Exam
3799 2026: 300 Practice Questions with
Answers & Rationales – Full Study Guide
for Los Angeles Department of Water &
Power Pre-Craft Trainee Test | Updated
for LAUSD, Trade Tech, Hayden, Lineman
College & Utility Craft Helper Bulletins
PASS THE LADWP ELECTRICAL CRAFT HELPER EXAM
(BULLETIN 3799) WITH CONFIDENCE! This
comprehensive study guide delivers 300 authentic
multiple-choice questions covering Ohm's Law, series &
parallel circuits, transformer operation, NEC safety
standards, LOTO procedures, PPE requirements, gear
ratios, basic math, mechanical aptitude, and LADWP-
specific distribution systems. Each question includes the
correct answer in bold italics and a detailed rationale
explaining the "why" behind every answer – reinforcing
concepts you'll actually see on test day. Developed for
candidates applying through LAUSD, Trade Tech,
Hayden Course, or Lineman College pathways. Covers
2026 updated requirements including OSHA approach
distances (10ft up to 50kV), GFCI/AFCI protection, arc
flash boundaries, service entrances, grounding, motor
,2|Page
controls, renewable energy, and substation basics.
Master all 300 questions with rationales to understand
core principles, not just memorize answers. Perfect for
self-study, classroom prep, or last-minute review.
Updated for the current application window (June 5-18,
2026). Ace your exam and start your career as an
Electrical Craft Helper with LADWP – the largest
municipal utility in the United States. Includes practice
questions on tool identification (multimeter, clamp
meter, megger), wire sizing (AWG), conduit bending,
rigging knots (figure-eight), and safe work practices. 300
Q&As – complete set. No guesswork – learn with
rationales. Exam-ready guaranteed!
1. What is the unit of measurement for electrical current?
A) Ohm
B) Volt
C) Ampere
D) Watt
*C) Ampere
Rationale: Current is measured in amperes. Ohms measure resistance, volts measure
electrical pressure, and watts measure power.
2. A circuit has a voltage of 240V and a resistance of 80Ω. What is the current?
A) 0.33 A
B) 3 A
C) 30 A
D) 320 A
*B) 3 A
Rationale: Using Ohm's Law, I = V / R = = 3 amperes.
,3|Page
3. What is the primary function of a transformer?
A) Convert AC to DC
B) Increase or decrease voltage levels
C) Store electrical charge
D) Measure power consumption
*B) Increase or decrease voltage levels
Rationale: Transformers use electromagnetic induction to step voltage up or down
while maintaining frequency.
4. What is the minimum safe approach distance for an unqualified worker near
an energized overhead line up to 50 kV?
A) 2 feet
B) 6 feet
C) 10 feet
D) 20 feet
*C) 10 feet
Rationale: OSHA and Cal-OSHA require unqualified personnel to maintain at least 10
feet of clearance from energized lines up to 50 kV.
5. Which knot is commonly tied at the end of a rope to prevent it from slipping
through a pulley or hole?
A) Bowline
B) Figure-eight knot
C) Square knot
D) Clove hitch
*B) Figure-eight knot
Rationale: The figure-eight knot is a stopper knot used to keep rope ends from passing
back through rigging equipment.
, 4|Page
6. What is 35% of 200?
A) 50
B) 60
C) 70
D) 80
*C) 70
Rationale: 0.35 × 200 = 70.
7. If a 10-tooth gear drives a 30-tooth gear, what is the gear ratio?
A) 1:1
B) 1:2
C) 1:3
D) 3:1
*C) 1:3
Rationale: The ratio is 10:30, which simplifies to 1:3 — meaning the driven gear turns
once for every three turns of the driver.
8. What type of circuit has two or more paths for current to flow?
A) Series
B) Parallel
C) Series-parallel
D) Short circuit
*B) Parallel
Rationale: A parallel circuit provides multiple branches for current, so if one path fails,
others continue conducting.
9. What is the correct first step when you arrive at a job site?
A) Begin working immediately
B) Identify and report hazards
C) Set up ladders
D) Check the weather
LADWP Electrical Craft Helper Exam
3799 2026: 300 Practice Questions with
Answers & Rationales – Full Study Guide
for Los Angeles Department of Water &
Power Pre-Craft Trainee Test | Updated
for LAUSD, Trade Tech, Hayden, Lineman
College & Utility Craft Helper Bulletins
PASS THE LADWP ELECTRICAL CRAFT HELPER EXAM
(BULLETIN 3799) WITH CONFIDENCE! This
comprehensive study guide delivers 300 authentic
multiple-choice questions covering Ohm's Law, series &
parallel circuits, transformer operation, NEC safety
standards, LOTO procedures, PPE requirements, gear
ratios, basic math, mechanical aptitude, and LADWP-
specific distribution systems. Each question includes the
correct answer in bold italics and a detailed rationale
explaining the "why" behind every answer – reinforcing
concepts you'll actually see on test day. Developed for
candidates applying through LAUSD, Trade Tech,
Hayden Course, or Lineman College pathways. Covers
2026 updated requirements including OSHA approach
distances (10ft up to 50kV), GFCI/AFCI protection, arc
flash boundaries, service entrances, grounding, motor
,2|Page
controls, renewable energy, and substation basics.
Master all 300 questions with rationales to understand
core principles, not just memorize answers. Perfect for
self-study, classroom prep, or last-minute review.
Updated for the current application window (June 5-18,
2026). Ace your exam and start your career as an
Electrical Craft Helper with LADWP – the largest
municipal utility in the United States. Includes practice
questions on tool identification (multimeter, clamp
meter, megger), wire sizing (AWG), conduit bending,
rigging knots (figure-eight), and safe work practices. 300
Q&As – complete set. No guesswork – learn with
rationales. Exam-ready guaranteed!
1. What is the unit of measurement for electrical current?
A) Ohm
B) Volt
C) Ampere
D) Watt
*C) Ampere
Rationale: Current is measured in amperes. Ohms measure resistance, volts measure
electrical pressure, and watts measure power.
2. A circuit has a voltage of 240V and a resistance of 80Ω. What is the current?
A) 0.33 A
B) 3 A
C) 30 A
D) 320 A
*B) 3 A
Rationale: Using Ohm's Law, I = V / R = = 3 amperes.
,3|Page
3. What is the primary function of a transformer?
A) Convert AC to DC
B) Increase or decrease voltage levels
C) Store electrical charge
D) Measure power consumption
*B) Increase or decrease voltage levels
Rationale: Transformers use electromagnetic induction to step voltage up or down
while maintaining frequency.
4. What is the minimum safe approach distance for an unqualified worker near
an energized overhead line up to 50 kV?
A) 2 feet
B) 6 feet
C) 10 feet
D) 20 feet
*C) 10 feet
Rationale: OSHA and Cal-OSHA require unqualified personnel to maintain at least 10
feet of clearance from energized lines up to 50 kV.
5. Which knot is commonly tied at the end of a rope to prevent it from slipping
through a pulley or hole?
A) Bowline
B) Figure-eight knot
C) Square knot
D) Clove hitch
*B) Figure-eight knot
Rationale: The figure-eight knot is a stopper knot used to keep rope ends from passing
back through rigging equipment.
, 4|Page
6. What is 35% of 200?
A) 50
B) 60
C) 70
D) 80
*C) 70
Rationale: 0.35 × 200 = 70.
7. If a 10-tooth gear drives a 30-tooth gear, what is the gear ratio?
A) 1:1
B) 1:2
C) 1:3
D) 3:1
*C) 1:3
Rationale: The ratio is 10:30, which simplifies to 1:3 — meaning the driven gear turns
once for every three turns of the driver.
8. What type of circuit has two or more paths for current to flow?
A) Series
B) Parallel
C) Series-parallel
D) Short circuit
*B) Parallel
Rationale: A parallel circuit provides multiple branches for current, so if one path fails,
others continue conducting.
9. What is the correct first step when you arrive at a job site?
A) Begin working immediately
B) Identify and report hazards
C) Set up ladders
D) Check the weather
