LADWP ELECTRICAL CRAFT HELPER EXAM:
Questions Latest 2026-2027 Update - Verified Solutions
with Detailed Rationales
Secure a top tier position on the Los Angeles Department of Water and
Power civil service hiring roster with this definitive 2026 Electrical Craft
Helper practice exam bank featuring questions. This comprehensive
preparation resource includes verified correct answers and detailed
technical rationales covering basic electrical circuits, tool safety,
mechanical reasoning, and OSHA regulations. It is an indispensable study
tool for aspiring utility workers looking to clear the highly competitive
examination on their first attempt and jumpstart their career.
Question 1
What is the total resistance of three 10Ω resistors connected in series?
A) 3.33 Ω
B) 10 Ω
C) 20 Ω
D) 30 Ω
Correct Answer: D
Rationale: For series resistors: Rt = R1 + R2 + R3 = 10 + 10 + 10 = 30Ω. In a series
circuit, total resistance is the sum of individual resistances .
Question 2
What is the approximate voltage drop percentage if a 34.5kV bus drops to 31kV during
heavy load?
,A) 8.2%
B) 9.5%
C) 10.1%
D) 11.3%
Correct Answer: C
Rationale: Percentage voltage drop = ((34.5 - 31) / 34.5) × 100 = (3..5) × 100 =
10.14%. This calculation is fundamental for LADWP operators assessing bus voltage
adequacy .
Question 3
If only one type of pliers can be supplied, which is most useful for general maintenance
and repair work?
A) Needle-nose pliers
B) Linesman pliers
C) Slip-joint pliers
D) Locking pliers
Correct Answer: C
Rationale: Slip-joint pliers are the most versatile for general maintenance and repair
work because they can adjust to grip different sizes of objects. They are a common and
practical choice for a wide variety of tasks .
Question 4
An "easy out" is also known as a:
A) Drill bit
B) Screw extractor
,C) Tap
D) Die
Correct Answer: B
Rationale: An "easy out" is a common trade name for a screw extractor, a tool used to
remove broken or damaged screws .
Question 5
What tool would be best used as a substitute for the pointed end of a spud wrench?
A) Screwdriver
B) Drift pin
C) Chisel
D) Pry bar
Correct Answer: B
Rationale: A drift pin is a tapered pin used to align holes, making it a suitable substitute
for the pointed end of a spud wrench for alignment tasks .
Question 6
Which type of wrench is best used on a round nut that has a series of notches cut in the
outer edge?
A) Box-end wrench
B) Open-end wrench
C) Socket wrench
D) Hook-spanner wrench
Correct Answer: D
, Rationale: A hook-spanner wrench is specifically designed to engage with the notches on
a round nut, making it the correct tool for that application .
Question 7
What does "amperage" commonly refer to when discussing an electrical circuit?
A) Conductor length
B) Amount of electrical current flowing through the circuit
C) Insulation thickness
D) Transformer frequency
Correct Answer: B
Rationale: Amperage is the common term used for electrical current measured in
amperes .
Question 8
Which statement best describes electrical power in a basic circuit where voltage and
current are known?
A) Power equals resistance divided by voltage
B) Power can be calculated by multiplying voltage by current
C) Power is measured only in ohms
D) Power cannot be calculated
Correct Answer: B
Rationale: Electrical power is commonly calculated using P = V × I and is measured in
watts .
Questions Latest 2026-2027 Update - Verified Solutions
with Detailed Rationales
Secure a top tier position on the Los Angeles Department of Water and
Power civil service hiring roster with this definitive 2026 Electrical Craft
Helper practice exam bank featuring questions. This comprehensive
preparation resource includes verified correct answers and detailed
technical rationales covering basic electrical circuits, tool safety,
mechanical reasoning, and OSHA regulations. It is an indispensable study
tool for aspiring utility workers looking to clear the highly competitive
examination on their first attempt and jumpstart their career.
Question 1
What is the total resistance of three 10Ω resistors connected in series?
A) 3.33 Ω
B) 10 Ω
C) 20 Ω
D) 30 Ω
Correct Answer: D
Rationale: For series resistors: Rt = R1 + R2 + R3 = 10 + 10 + 10 = 30Ω. In a series
circuit, total resistance is the sum of individual resistances .
Question 2
What is the approximate voltage drop percentage if a 34.5kV bus drops to 31kV during
heavy load?
,A) 8.2%
B) 9.5%
C) 10.1%
D) 11.3%
Correct Answer: C
Rationale: Percentage voltage drop = ((34.5 - 31) / 34.5) × 100 = (3..5) × 100 =
10.14%. This calculation is fundamental for LADWP operators assessing bus voltage
adequacy .
Question 3
If only one type of pliers can be supplied, which is most useful for general maintenance
and repair work?
A) Needle-nose pliers
B) Linesman pliers
C) Slip-joint pliers
D) Locking pliers
Correct Answer: C
Rationale: Slip-joint pliers are the most versatile for general maintenance and repair
work because they can adjust to grip different sizes of objects. They are a common and
practical choice for a wide variety of tasks .
Question 4
An "easy out" is also known as a:
A) Drill bit
B) Screw extractor
,C) Tap
D) Die
Correct Answer: B
Rationale: An "easy out" is a common trade name for a screw extractor, a tool used to
remove broken or damaged screws .
Question 5
What tool would be best used as a substitute for the pointed end of a spud wrench?
A) Screwdriver
B) Drift pin
C) Chisel
D) Pry bar
Correct Answer: B
Rationale: A drift pin is a tapered pin used to align holes, making it a suitable substitute
for the pointed end of a spud wrench for alignment tasks .
Question 6
Which type of wrench is best used on a round nut that has a series of notches cut in the
outer edge?
A) Box-end wrench
B) Open-end wrench
C) Socket wrench
D) Hook-spanner wrench
Correct Answer: D
, Rationale: A hook-spanner wrench is specifically designed to engage with the notches on
a round nut, making it the correct tool for that application .
Question 7
What does "amperage" commonly refer to when discussing an electrical circuit?
A) Conductor length
B) Amount of electrical current flowing through the circuit
C) Insulation thickness
D) Transformer frequency
Correct Answer: B
Rationale: Amperage is the common term used for electrical current measured in
amperes .
Question 8
Which statement best describes electrical power in a basic circuit where voltage and
current are known?
A) Power equals resistance divided by voltage
B) Power can be calculated by multiplying voltage by current
C) Power is measured only in ohms
D) Power cannot be calculated
Correct Answer: B
Rationale: Electrical power is commonly calculated using P = V × I and is measured in
watts .
