LADWP ELECTRICAL MAINTENANCE
COMPREHENSIVE PRACTICE EXAM WITH
QUESTIONS AND VERIFIED ANSWERS,
PLUS DETAILED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. Preventive Maintenance Strategy
A maintenance electrician is developing a preventive-maintenance
program for a large water and power facility containing motors, motor
control centers (MCCs), transformers, switchgear, control panels, and
emergency generators. Which approach provides the strongest overall
preventive-maintenance strategy?
A. Replace every component at a fixed interval regardless of condition
B. Perform maintenance only after equipment fails, while keeping spare
parts available
C. Combine manufacturer recommendations, operating history,
inspection results, condition monitoring, and equipment criticality
D. Perform visual inspections only because energized electrical testing is
inherently unnecessary
Answer: C. Combine manufacturer recommendations, operating
history, inspection results, condition monitoring, and equipment
criticality
Rationale: A comprehensive maintenance program uses multiple
sources of information rather than relying exclusively on calendar-
based replacement or reactive repair. Equipment criticality helps
prioritize resources, while inspection, testing, historical failure
information, and condition-monitoring data help identify deterioration
1
,before failure. Fixed-interval replacement can waste serviceable
components, while reactive maintenance increases the possibility of
unexpected outages, equipment damage, and safety incidents.
2. Electrical Safety Before Maintenance
Before beginning maintenance inside an electrical enclosure that may
contain multiple sources of electrical energy, what is the most
appropriate first principle to apply?
A. Assume the equipment is de-energized if its main disconnect is open
B. Identify all energy sources and establish an appropriate electrically
safe work condition before performing exposed electrical work
C. Wear rubber gloves and proceed without disconnecting the circuit
D. Turn off the local control switch and immediately begin maintenance
Answer: B. Identify all energy sources and establish an appropriate
electrically safe work condition before performing exposed electrical
work
Rationale: Opening a disconnect or operating a local control does not
automatically prove that all hazardous energy has been removed.
Equipment may have multiple incoming sources, backfeeds, stored
energy, control circuits, capacitors, generators, UPS systems, or other
sources. Proper electrical maintenance requires identifying applicable
sources, isolating them, controlling hazardous energy, and verifying
the condition before work proceeds.
3. Lockout/Tagout Verification
An electrician has opened the disconnect for a motor and applied a lock
and tag. Before touching exposed conductors, which action provides the
most important additional verification?
2
,A. Ask another employee whether the motor has been turned off
B. Check whether the motor stopped rotating
C. Test for absence of voltage using an appropriately rated test
instrument and an established verification procedure
D. Place a warning sign on the motor and begin work
Answer: C. Test for absence of voltage using an appropriately rated
test instrument and an established verification procedure
Rationale: A stopped motor does not prove that conductors are de-
energized. A motor can stop because of a control signal while line
conductors remain energized. Absence-of-voltage verification is
essential before exposed electrical conductors are contacted. The test
instrument itself should also be verified as functioning properly
according to the applicable electrical-safety procedure.
4. Multimeter Selection
An electrician needs to measure voltage on a 480-V industrial
distribution system. Which characteristic of the multimeter is especially
important?
A. The meter should have the lowest possible impedance regardless of
application
B. The meter must be appropriately rated for the electrical environment
and expected voltage category
C. The meter only needs to display AC voltage
D. The meter should be selected based solely on physical size
Answer: B. The meter must be appropriately rated for the electrical
environment and expected voltage category
Rationale: Industrial electrical systems can produce substantial
transient voltages and fault energy. A properly rated test instrument,
leads, and accessories are essential. The nominal circuit voltage alone
3
, does not fully describe the hazards present at the measurement point.
Properly rated equipment helps prevent meter failure, arc flash,
electric shock, and inaccurate measurements.
5. Three-Phase Motor Rotation
A newly installed three-phase motor runs in the opposite direction from
the required direction. Assuming the motor and mechanical system are
otherwise suitable, what is the usual electrical correction?
A. Increase the motor's voltage
B. Reverse the polarity of the control transformer
C. Interchange any two of the three phase conductors supplying the
motor
D. Increase the overload relay setting
Answer: C. Interchange any two of the three phase conductors
supplying the motor
Rationale: The direction of rotation of a three-phase induction motor
depends on phase sequence. Interchanging any two phase conductors
reverses the phase sequence and therefore reverses motor rotation.
The work must be performed under appropriate electrical-safety
procedures; changing overload settings or control voltage does not
correct phase sequence.
6. Motor Overload Protection
A three-phase induction motor repeatedly trips its overload protection
during normal operation. Which diagnostic approach is most
appropriate?
A. Immediately increase the overload setting
B. Determine whether the motor is overloaded, mechanically restricted,
4
COMPREHENSIVE PRACTICE EXAM WITH
QUESTIONS AND VERIFIED ANSWERS,
PLUS DETAILED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. Preventive Maintenance Strategy
A maintenance electrician is developing a preventive-maintenance
program for a large water and power facility containing motors, motor
control centers (MCCs), transformers, switchgear, control panels, and
emergency generators. Which approach provides the strongest overall
preventive-maintenance strategy?
A. Replace every component at a fixed interval regardless of condition
B. Perform maintenance only after equipment fails, while keeping spare
parts available
C. Combine manufacturer recommendations, operating history,
inspection results, condition monitoring, and equipment criticality
D. Perform visual inspections only because energized electrical testing is
inherently unnecessary
Answer: C. Combine manufacturer recommendations, operating
history, inspection results, condition monitoring, and equipment
criticality
Rationale: A comprehensive maintenance program uses multiple
sources of information rather than relying exclusively on calendar-
based replacement or reactive repair. Equipment criticality helps
prioritize resources, while inspection, testing, historical failure
information, and condition-monitoring data help identify deterioration
1
,before failure. Fixed-interval replacement can waste serviceable
components, while reactive maintenance increases the possibility of
unexpected outages, equipment damage, and safety incidents.
2. Electrical Safety Before Maintenance
Before beginning maintenance inside an electrical enclosure that may
contain multiple sources of electrical energy, what is the most
appropriate first principle to apply?
A. Assume the equipment is de-energized if its main disconnect is open
B. Identify all energy sources and establish an appropriate electrically
safe work condition before performing exposed electrical work
C. Wear rubber gloves and proceed without disconnecting the circuit
D. Turn off the local control switch and immediately begin maintenance
Answer: B. Identify all energy sources and establish an appropriate
electrically safe work condition before performing exposed electrical
work
Rationale: Opening a disconnect or operating a local control does not
automatically prove that all hazardous energy has been removed.
Equipment may have multiple incoming sources, backfeeds, stored
energy, control circuits, capacitors, generators, UPS systems, or other
sources. Proper electrical maintenance requires identifying applicable
sources, isolating them, controlling hazardous energy, and verifying
the condition before work proceeds.
3. Lockout/Tagout Verification
An electrician has opened the disconnect for a motor and applied a lock
and tag. Before touching exposed conductors, which action provides the
most important additional verification?
2
,A. Ask another employee whether the motor has been turned off
B. Check whether the motor stopped rotating
C. Test for absence of voltage using an appropriately rated test
instrument and an established verification procedure
D. Place a warning sign on the motor and begin work
Answer: C. Test for absence of voltage using an appropriately rated
test instrument and an established verification procedure
Rationale: A stopped motor does not prove that conductors are de-
energized. A motor can stop because of a control signal while line
conductors remain energized. Absence-of-voltage verification is
essential before exposed electrical conductors are contacted. The test
instrument itself should also be verified as functioning properly
according to the applicable electrical-safety procedure.
4. Multimeter Selection
An electrician needs to measure voltage on a 480-V industrial
distribution system. Which characteristic of the multimeter is especially
important?
A. The meter should have the lowest possible impedance regardless of
application
B. The meter must be appropriately rated for the electrical environment
and expected voltage category
C. The meter only needs to display AC voltage
D. The meter should be selected based solely on physical size
Answer: B. The meter must be appropriately rated for the electrical
environment and expected voltage category
Rationale: Industrial electrical systems can produce substantial
transient voltages and fault energy. A properly rated test instrument,
leads, and accessories are essential. The nominal circuit voltage alone
3
, does not fully describe the hazards present at the measurement point.
Properly rated equipment helps prevent meter failure, arc flash,
electric shock, and inaccurate measurements.
5. Three-Phase Motor Rotation
A newly installed three-phase motor runs in the opposite direction from
the required direction. Assuming the motor and mechanical system are
otherwise suitable, what is the usual electrical correction?
A. Increase the motor's voltage
B. Reverse the polarity of the control transformer
C. Interchange any two of the three phase conductors supplying the
motor
D. Increase the overload relay setting
Answer: C. Interchange any two of the three phase conductors
supplying the motor
Rationale: The direction of rotation of a three-phase induction motor
depends on phase sequence. Interchanging any two phase conductors
reverses the phase sequence and therefore reverses motor rotation.
The work must be performed under appropriate electrical-safety
procedures; changing overload settings or control voltage does not
correct phase sequence.
6. Motor Overload Protection
A three-phase induction motor repeatedly trips its overload protection
during normal operation. Which diagnostic approach is most
appropriate?
A. Immediately increase the overload setting
B. Determine whether the motor is overloaded, mechanically restricted,
4
