LADWP Electrical Craft Helper Ultimate Exam Prep Complete
Test Bank 2026-2027
Secure a top rank on the Los Angeles Department of Water and Power civil service
hiring list with this definitive Electrical Craft Helper practice exam bank. This
comprehensive preparation guide features realistic test questions with verified correct
answers and detailed technical rationales covering basic electrical theory, safe tool
usage, mechanical reasoning, and OSHA safety regulations. It is an indispensable
resource for aspiring utility workers looking to clear the competitive examination on their
first attempt.
Question 1
Before starting work on any electrical equipment at LADWP, the first priority is to:
A) Complete the job as quickly as possible to restore service
B) Notify the customer of the planned outage
C) Identify all energy sources and perform a hazard assessment
D) Order replacement parts for the equipment
Correct Answer: C
Rationale: Before beginning any work, identifying all energy sources and performing a
hazard assessment is the first priority. This aligns with LADWP's safety culture and OSHA
requirements for establishing an electrically safe work condition. Notifying customers (B) is
important but secondary to safety assessment. Speed (A) should never compromise safety.
Question 2
Which of the following is NOT a recognized energy source requiring lockout/tagout?
A) Electrical energy
B) Pneumatic energy
,C) Solar energy
D) Hydraulic energy
Correct Answer: C
Rationale: Solar energy is not a stored hazardous energy source requiring lockout/tagout.
LOTO applies to electrical, mechanical, pneumatic, hydraulic, chemical, thermal, and
stored energy sources that could cause injury if unexpectedly released. Solar energy is
typically an energy source for generation, not a stored hazard in equipment.
Question 3
What is the correct sequence for applying lockout/tagout devices?
A) Apply lock, apply tag, verify de-energized, test equipment
B) Notify workers, shut down, lock, tag, verify de-energized, test
C) Tag, lock, shut down, notify, test
D) Notify, test, lock, tag, shut down
Correct Answer: B
Rationale: The correct LOTO sequence is: notify affected workers, shut down equipment,
apply lock, apply tag, verify zero-energy state (test), then perform work. Testing after
locking (A) incorrectly places testing before verification. LOTO requires that verification of
de-energization occurs after locks are applied to ensure the equipment cannot be
restarted.
,Question 4
Which of the following materials has the highest electrical conductivity?
A) Aluminum
B) Copper
C) Silver
D) Gold
Correct Answer: C
Rationale: Silver has the highest electrical conductivity of all metals. However, copper is
the most commonly used conductor in electrical work due to its excellent conductivity and
lower cost compared to silver. Aluminum is also used but has lower conductivity than
copper.
Question 5
When measuring resistance with a digital multimeter, the circuit should be:
A) Energized to get an accurate reading
B) De-energized and isolated from power sources
C) Connected in series with a load
D) At maximum voltage
Correct Answer: B
Rationale: Resistance measurements require the circuit to be de-energized and isolated
from power sources. Energized circuits can damage the meter and give inaccurate
readings. The meter provides its own small voltage for measuring resistance.
, Question 6
The standard unit of frequency in AC electrical systems is the:
A) Ampere
B) Volt
C) Hertz
D) Watt
Correct Answer: C
Rationale: Frequency is measured in Hertz (Hz), which represents cycles per second.
LADWP's power system operates at 60 Hz, meaning the AC alternates direction 60 times
per second. Amperes measure current, volts measure pressure, and watts measure power.
Question 7
What type of diagram shows the physical layout of electrical equipment and
components?
A) One-line diagram
B) Schematic diagram
C) Wiring diagram
D) Riser diagram
Correct Answer: C
Rationale: A wiring diagram shows the physical layout of equipment and components,
including their actual positions and connections. One-line diagrams show system function
Test Bank 2026-2027
Secure a top rank on the Los Angeles Department of Water and Power civil service
hiring list with this definitive Electrical Craft Helper practice exam bank. This
comprehensive preparation guide features realistic test questions with verified correct
answers and detailed technical rationales covering basic electrical theory, safe tool
usage, mechanical reasoning, and OSHA safety regulations. It is an indispensable
resource for aspiring utility workers looking to clear the competitive examination on their
first attempt.
Question 1
Before starting work on any electrical equipment at LADWP, the first priority is to:
A) Complete the job as quickly as possible to restore service
B) Notify the customer of the planned outage
C) Identify all energy sources and perform a hazard assessment
D) Order replacement parts for the equipment
Correct Answer: C
Rationale: Before beginning any work, identifying all energy sources and performing a
hazard assessment is the first priority. This aligns with LADWP's safety culture and OSHA
requirements for establishing an electrically safe work condition. Notifying customers (B) is
important but secondary to safety assessment. Speed (A) should never compromise safety.
Question 2
Which of the following is NOT a recognized energy source requiring lockout/tagout?
A) Electrical energy
B) Pneumatic energy
,C) Solar energy
D) Hydraulic energy
Correct Answer: C
Rationale: Solar energy is not a stored hazardous energy source requiring lockout/tagout.
LOTO applies to electrical, mechanical, pneumatic, hydraulic, chemical, thermal, and
stored energy sources that could cause injury if unexpectedly released. Solar energy is
typically an energy source for generation, not a stored hazard in equipment.
Question 3
What is the correct sequence for applying lockout/tagout devices?
A) Apply lock, apply tag, verify de-energized, test equipment
B) Notify workers, shut down, lock, tag, verify de-energized, test
C) Tag, lock, shut down, notify, test
D) Notify, test, lock, tag, shut down
Correct Answer: B
Rationale: The correct LOTO sequence is: notify affected workers, shut down equipment,
apply lock, apply tag, verify zero-energy state (test), then perform work. Testing after
locking (A) incorrectly places testing before verification. LOTO requires that verification of
de-energization occurs after locks are applied to ensure the equipment cannot be
restarted.
,Question 4
Which of the following materials has the highest electrical conductivity?
A) Aluminum
B) Copper
C) Silver
D) Gold
Correct Answer: C
Rationale: Silver has the highest electrical conductivity of all metals. However, copper is
the most commonly used conductor in electrical work due to its excellent conductivity and
lower cost compared to silver. Aluminum is also used but has lower conductivity than
copper.
Question 5
When measuring resistance with a digital multimeter, the circuit should be:
A) Energized to get an accurate reading
B) De-energized and isolated from power sources
C) Connected in series with a load
D) At maximum voltage
Correct Answer: B
Rationale: Resistance measurements require the circuit to be de-energized and isolated
from power sources. Energized circuits can damage the meter and give inaccurate
readings. The meter provides its own small voltage for measuring resistance.
, Question 6
The standard unit of frequency in AC electrical systems is the:
A) Ampere
B) Volt
C) Hertz
D) Watt
Correct Answer: C
Rationale: Frequency is measured in Hertz (Hz), which represents cycles per second.
LADWP's power system operates at 60 Hz, meaning the AC alternates direction 60 times
per second. Amperes measure current, volts measure pressure, and watts measure power.
Question 7
What type of diagram shows the physical layout of electrical equipment and
components?
A) One-line diagram
B) Schematic diagram
C) Wiring diagram
D) Riser diagram
Correct Answer: C
Rationale: A wiring diagram shows the physical layout of equipment and components,
including their actual positions and connections. One-line diagrams show system function
