Exam Questions And Correct Answers

Ohio Utility Line Worker Class A Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the minimum safe distance from a 15 kV energized line when

working with conductive tools?

• 5 feet
• 10 feet
• 15 feet
• 20 feet

Rationale: OSHA requires a minimum approach distance of 10 feet

for lines up to 50 kV to prevent accidental contact with energized conductors.

• What is the primary purpose of grounding a de-energized line?

a) To balance load

b) To improve insulation

c) To protect workers from induced voltage and accidental re- 1 / 4

energization

d) To reduce line resistance

Rationale: Grounding prevents electrical shock by giving a safe path

for any unintended current to flow to earth.

• When performing pole-top rescue, what is the first step?

a) Assess the scene for safety

b) Cut the victim’s safety belt

c) Lower the victim immediately

d) Call for backup

Rationale: The rescuer must first ensure their own safety to avoid

becoming a second victim.

• Which knot is commonly used to secure a rope to a pole?

a) Square knot

b) Slip knot

c) Clove hitch

d) Bowline

Rationale: The clove hitch is easy to tie and untie and provides good

friction on poles and crossarms.

• What color tag usually indicates a defective or unsafe tool?

a) Blue

b) Green

c) Red

d) Yellow 2 / 4

Rationale: Red tags universally signal danger or that equipment is

out of service.

• What is the standard frequency of electrical power in the U.S.?
• 25 Hz
• 100 Hz
• 60 Hz
• 120 Hz

Rationale: U.S. utility systems operate at 60 Hz, the standard

frequency for alternating current.

• Which device automatically opens a circuit when overload occurs?

a) Transformer

b) Recloser

c) Circuit breaker

d) Regulator

Rationale: A circuit breaker interrupts current flow to protect

equipment from damage due to overcurrent.

• When climbing a pole, the worker must keep how many points of

contact?

a) One

b) Two

c) Three

d) Four 3 / 4

Rationale: Maintaining three points of contact ensures balance and

stability while climbing.

• What type of gloves must be used when handling energized

conductors?

a) Leather gloves only

b) Insulating rubber gloves with leather protectors

c) Cotton gloves

d) Plastic gloves

Rationale: Rubber gloves protect against electric shock, while leather

protectors prevent mechanical damage.

• What is the main function of a bucket truck’s dielectric boom?

a) To support tools

b) To provide insulation from electrical current

c) To carry more load

d) To stabilize the truck

Rationale: Dielectric booms prevent electrical current from flowing

through the truck and operator.

• Which transformer configuration provides a neutral point for

grounding?

a) Delta–Delta

b) Open Delta

c) Wye–Wye

d) Series

• / 4