LADWP ELECTRIC STATION OPERATOR EXAM — 2025/2026
EDITION | CIRCUIT BREAKERS, DISCONNECTS,
TRANSFORMERS | VERIFIED QUESTIONS WITH PASSED
ANSWERS
LADWP ELECTRIC STATION OPERATOR EXAM
2025/2026 PRACTICE EDITION
CIRCUIT BREAKERS • DISCONNECTS • TRANSFORMERS • SWITCHING •
ELECTRICAL SAFETY
COURSE CODE: ESO-2025/26
COURSE NAME: ELECTRIC STATION OPERATOR EXAMINATION PREPARATION
INSTITUTION: LOS ANGELES DEPARTMENT OF WATER AND POWER (LADWP) —
EXAM PREPARATION RESOURCE
EDITION: 2025/2026
AUTHOR/CREATOR: ORIGINAL PRACTICE EXAMINATION GENERATED FOR
STUDY AND PREPARATION
IMPORTANT NOTICE
This is an original practice examination prepared for educational use.
The questions are designed to test the concepts commonly associated with Electric
Station Operator preparation, including high-voltage switching, circuit breakers,
disconnects, transformers, protection, electrical theory, operating procedures, and
safety.
TABLE OF CONTENTS
1. Section I — Switching Operations and Station Fundamentals ........ 1
2. Section II — Circuit Breakers .................................................. 2
3. Section III — Disconnect Switches and Isolation ..................... 3
4. Section IV — Transformers ......................................................... 4
5. Section V — Electrical Protection and Faults ............................ 5
6. Section VI — Station Equipment and Instrumentation .............. 6
, 7. Section VII — Safety, Switching Procedures and LOTO ............ 7
8. Section VIII — System Operation and Troubleshooting ............ 8
9. Section IX — Electrical Theory and Calculations ...................... 9
10. Section X — Integrated Operator Scenarios ............................. 10
Total Questions: 100
SECTION I — SWITCHING OPERATIONS AND STATION FUNDAMENTALS
Question 1 — Multiple Choice
One of the primary responsibilities of an Electric Station Operator is:
A. Designing transmission towers
B. Switching electrical circuits safely
C. Manufacturing transformers
D. Installing residential meters
Correct Answer: B — Switching electrical circuits safely
Rationale: Station operators are responsible for operating electrical equipment and performing
switching activities in accordance with established procedures. Correct switching protects
personnel, equipment, and system reliability. Improper switching can cause faults, equipment
damage, or unnecessary outages.
Question 2 — Multiple Choice
Which switching operation is primarily associated with maintenance, construction, cleaning, or
testing?
A. Routine switching
B. Emergency switching
C. Protective switching
D. Fault switching
Correct Answer: A — Routine switching
Rationale: Routine switching is planned work performed under established procedures. It differs
from emergency switching, which is performed in response to abnormal system conditions or
outages.
,Question 3 — Multiple Choice
Automatic switching can include:
A. Automatic transfer operations
B. Manual grounding only
C. Transformer oil sampling
D. Cable splicing
Correct Answer: A — Automatic transfer operations
Rationale: Automatic switching equipment can transfer loads, respond to voltage conditions, or
perform other predefined operations without direct manual initiation for every operation.
Question 4 — Short Answer
Why is switching order important in a high-voltage electrical system?
Correct Answer: Switching order ensures equipment is opened, isolated, grounded, energized,
or returned to service in the correct sequence.
Rationale: Electrical systems are interconnected. Performing operations in the wrong sequence
can expose personnel to hazardous energy, create fault conditions, energize equipment
unexpectedly, or interrupt service unnecessarily. Operators therefore follow approved switching
orders and system instructions.
Question 5 — Multiple Choice
Before operating high-voltage equipment, an operator should primarily verify:
A. The weather forecast only
B. The equipment identity and authorized switching instruction
C. The color of the equipment
D. The age of the equipment
Correct Answer: B — The equipment identity and authorized switching instruction
Rationale: Positive identification of equipment and confirmation of the authorized operating
order are fundamental controls against operating the wrong device.
Question 6 — Multiple Choice
An electrical switch that is operated improperly can potentially:
, A. Improve system reliability automatically
B. Cause personnel hazards and equipment damage
C. Eliminate all faults
D. Reduce every load current
Correct Answer: B — Cause personnel hazards and equipment damage
Rationale: Switching devices may be connected to high-energy systems. Incorrect operation can
produce arcs, faults, unintended energization, or service interruptions.
Question 7 — Short Answer
What is meant by “energized” equipment?
Correct Answer: Equipment is energized when it is electrically connected to a source or
otherwise has electrical potential present.
Rationale: Energized equipment must be treated as electrically hazardous unless the required
isolation and verification procedures establish an electrically safe condition.
Question 8 — Multiple Choice
Which condition generally requires the greatest caution before manipulating a switching device?
A. Known de-energized equipment under an approved safe condition
B. Equipment with uncertain identity or status
C. A properly labeled low-voltage control panel
D. A completed inspection report
Correct Answer: B — Equipment with uncertain identity or status
Rationale: Uncertainty about equipment identity or electrical status is itself a hazard. The
operator should stop and resolve the uncertainty rather than proceed based on assumptions.
Question 9 — Multiple Choice
The primary purpose of an operating procedure is to:
A. Replace operator judgment entirely
B. Establish a controlled and repeatable method for performing an operation
C. Increase equipment voltage
D. Eliminate maintenance requirements
EDITION | CIRCUIT BREAKERS, DISCONNECTS,
TRANSFORMERS | VERIFIED QUESTIONS WITH PASSED
ANSWERS
LADWP ELECTRIC STATION OPERATOR EXAM
2025/2026 PRACTICE EDITION
CIRCUIT BREAKERS • DISCONNECTS • TRANSFORMERS • SWITCHING •
ELECTRICAL SAFETY
COURSE CODE: ESO-2025/26
COURSE NAME: ELECTRIC STATION OPERATOR EXAMINATION PREPARATION
INSTITUTION: LOS ANGELES DEPARTMENT OF WATER AND POWER (LADWP) —
EXAM PREPARATION RESOURCE
EDITION: 2025/2026
AUTHOR/CREATOR: ORIGINAL PRACTICE EXAMINATION GENERATED FOR
STUDY AND PREPARATION
IMPORTANT NOTICE
This is an original practice examination prepared for educational use.
The questions are designed to test the concepts commonly associated with Electric
Station Operator preparation, including high-voltage switching, circuit breakers,
disconnects, transformers, protection, electrical theory, operating procedures, and
safety.
TABLE OF CONTENTS
1. Section I — Switching Operations and Station Fundamentals ........ 1
2. Section II — Circuit Breakers .................................................. 2
3. Section III — Disconnect Switches and Isolation ..................... 3
4. Section IV — Transformers ......................................................... 4
5. Section V — Electrical Protection and Faults ............................ 5
6. Section VI — Station Equipment and Instrumentation .............. 6
, 7. Section VII — Safety, Switching Procedures and LOTO ............ 7
8. Section VIII — System Operation and Troubleshooting ............ 8
9. Section IX — Electrical Theory and Calculations ...................... 9
10. Section X — Integrated Operator Scenarios ............................. 10
Total Questions: 100
SECTION I — SWITCHING OPERATIONS AND STATION FUNDAMENTALS
Question 1 — Multiple Choice
One of the primary responsibilities of an Electric Station Operator is:
A. Designing transmission towers
B. Switching electrical circuits safely
C. Manufacturing transformers
D. Installing residential meters
Correct Answer: B — Switching electrical circuits safely
Rationale: Station operators are responsible for operating electrical equipment and performing
switching activities in accordance with established procedures. Correct switching protects
personnel, equipment, and system reliability. Improper switching can cause faults, equipment
damage, or unnecessary outages.
Question 2 — Multiple Choice
Which switching operation is primarily associated with maintenance, construction, cleaning, or
testing?
A. Routine switching
B. Emergency switching
C. Protective switching
D. Fault switching
Correct Answer: A — Routine switching
Rationale: Routine switching is planned work performed under established procedures. It differs
from emergency switching, which is performed in response to abnormal system conditions or
outages.
,Question 3 — Multiple Choice
Automatic switching can include:
A. Automatic transfer operations
B. Manual grounding only
C. Transformer oil sampling
D. Cable splicing
Correct Answer: A — Automatic transfer operations
Rationale: Automatic switching equipment can transfer loads, respond to voltage conditions, or
perform other predefined operations without direct manual initiation for every operation.
Question 4 — Short Answer
Why is switching order important in a high-voltage electrical system?
Correct Answer: Switching order ensures equipment is opened, isolated, grounded, energized,
or returned to service in the correct sequence.
Rationale: Electrical systems are interconnected. Performing operations in the wrong sequence
can expose personnel to hazardous energy, create fault conditions, energize equipment
unexpectedly, or interrupt service unnecessarily. Operators therefore follow approved switching
orders and system instructions.
Question 5 — Multiple Choice
Before operating high-voltage equipment, an operator should primarily verify:
A. The weather forecast only
B. The equipment identity and authorized switching instruction
C. The color of the equipment
D. The age of the equipment
Correct Answer: B — The equipment identity and authorized switching instruction
Rationale: Positive identification of equipment and confirmation of the authorized operating
order are fundamental controls against operating the wrong device.
Question 6 — Multiple Choice
An electrical switch that is operated improperly can potentially:
, A. Improve system reliability automatically
B. Cause personnel hazards and equipment damage
C. Eliminate all faults
D. Reduce every load current
Correct Answer: B — Cause personnel hazards and equipment damage
Rationale: Switching devices may be connected to high-energy systems. Incorrect operation can
produce arcs, faults, unintended energization, or service interruptions.
Question 7 — Short Answer
What is meant by “energized” equipment?
Correct Answer: Equipment is energized when it is electrically connected to a source or
otherwise has electrical potential present.
Rationale: Energized equipment must be treated as electrically hazardous unless the required
isolation and verification procedures establish an electrically safe condition.
Question 8 — Multiple Choice
Which condition generally requires the greatest caution before manipulating a switching device?
A. Known de-energized equipment under an approved safe condition
B. Equipment with uncertain identity or status
C. A properly labeled low-voltage control panel
D. A completed inspection report
Correct Answer: B — Equipment with uncertain identity or status
Rationale: Uncertainty about equipment identity or electrical status is itself a hazard. The
operator should stop and resolve the uncertainty rather than proceed based on assumptions.
Question 9 — Multiple Choice
The primary purpose of an operating procedure is to:
A. Replace operator judgment entirely
B. Establish a controlled and repeatable method for performing an operation
C. Increase equipment voltage
D. Eliminate maintenance requirements
