Exam Practice Test Questions And

Electrical Line Worker Certification Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a transformer in electrical power

systems?

a) To convert AC to DC

b) To step voltage up or down

c) To regulate current flow

d) To store electrical energy

Rationale: A transformer changes voltage levels between circuits,

allowing efficient power transmission and distribution.

• Which type of current alternates direction periodically?

a) Alternating current (AC)

b) Direct current (DC) 1 / 4

c) Static current

d) Pulsating current

Rationale: AC reverses direction periodically, while DC flows in only

one direction.

• What is the standard frequency of AC power in most parts of the

world?

• 50 or 60 Hz
• 25 Hz
• 100 Hz
• 75 Hz

Rationale: Power systems operate at 50 Hz (Europe, Asia, Africa) or

60 Hz (North America).

• Which device is used to protect a circuit from excessive current flow?

a) Transformer

b) Capacitor

c) Fuse

d) Relay

Rationale: A fuse melts and opens the circuit when current exceeds

its rated value, preventing damage.

• What is the main function of a circuit breaker?

a) To interrupt excessive current automatically

b) To measure voltage

c) To increase resistance 2 / 4

d) To convert current

Rationale: Circuit breakers disconnect power during overloads or

short circuits to protect equipment.

• Which PPE is most critical for protection against electrical arc flash?

a) Hard hat

b) Safety glasses

c) Arc-rated clothing

d) Rubber boots

Rationale: Arc-rated clothing resists high heat and protects workers

from burns during arc flashes.

• What is the term for the path through which electric current flows?

a) Resistance

b) Potential

c) Circuit

d) Load

Rationale: A circuit provides a closed path for current to travel from

source to load.

• What does Ohm’s Law state?

a) Voltage = Current × Resistance

b) Power = Voltage × Current

c) Resistance = Voltage ÷ Power

d) Current = Power × Voltage 3 / 4

Rationale: Ohm’s Law defines the relationship among voltage,

current, and resistance.

• What unit measures electrical resistance?

a) Volt

b) Ampere

c) Ohm

d) Watt

Rationale: Resistance is measured in ohms (Ω), indicating how much

a material opposes current.

• What does PPE stand for?

a) Power Protection Equipment

b) Personal Protective Equipment

c) Primary Power Essentials

d) Portable Power Elements

Rationale: PPE refers to safety gear worn to minimize exposure to

workplace hazards.

• Which tool is used to measure electrical current?

a) Voltmeter

b) Ammeter

c) Ohmmeter

d) Wattmeter

Rationale: Ammeters measure current flow in amperes.

• / 4