MASTER ELECTRICIAN EXAM
questions with correct answers
plus rationales 2026/2027 edition
with instant pdf download
1. Which electrical quantity represents the opposition to
current flow in a circuit?
A. Voltage
B. Power
C. Resistance
D. Frequency
Correct Answer: C. Resistance
Rationale: Resistance is the opposition a material or device
presents to the flow of electric current. It is measured in ohms
(Ω). According to Ohm's law, resistance can be calculated by
dividing voltage by current.
2. A 240-volt circuit supplies a 12-ohm heating load. What
current does the load draw?
A. 10 A
B. 20 A
C. 28.8 A
D. 40 A
Correct Answer: B. 20 A
,Rationale: Ohm's law states that current equals voltage divided by
resistance. Therefore, I = 240 V ÷ 12 Ω = 20 A.
3. What is the primary purpose of a circuit breaker?
A. Increase circuit voltage
B. Provide overcurrent protection
C. Improve power factor
D. Reduce conductor resistance
Correct Answer: B. Provide overcurrent protection
Rationale: A circuit breaker is designed to open a circuit
automatically when current exceeds its allowable rating. This
protects conductors and equipment from damage caused by
overloads and short circuits.
4. Which conductor is normally identified as the equipment
grounding conductor?
A. White
B. Gray
C. Green or bare
D. Orange
Correct Answer: C. Green or bare
Rationale: Equipment grounding conductors are commonly
identified by a continuous green covering, green with yellow
stripes where permitted, or by being bare. Their purpose is to
provide a low-impedance path for fault current.
,5. What is the main purpose of bonding?
A. Increase circuit voltage
B. Establish electrical continuity between conductive parts
C. Reduce conductor size
D. Increase equipment operating temperature
Correct Answer: B. Establish electrical continuity between
conductive parts
Rationale: Bonding connects normally non-current-carrying
conductive parts together so that fault current has an effective
path back to the source. This helps protective devices operate
quickly during faults.
6. A 120-volt load draws 15 amperes. What is its approximate
power consumption?
A. 800 W
B. 1,200 W
C. 1,800 W
D. 2,400 W
Correct Answer: C. 1,800 W
Rationale: For a resistive load, power is calculated as P = V × I.
Therefore, 120 V × 15 A = 1,800 watts.
7. What is the purpose of a grounding electrode system?
A. To carry normal load current
B. To establish a connection to earth for the electrical system
C. To increase circuit impedance
D. To replace overcurrent protection
, Correct Answer: B. To establish a connection to earth for the
electrical system
Rationale: A grounding electrode system connects the electrical
system to earth. It helps stabilize voltage to ground and provides a
path for certain electrical events such as lightning and surges, but
it is not intended to serve as the normal fault-current path.
8. Which type of circuit is commonly used to control a lighting
load from two locations?
A. Single-pole circuit
B. Three-way switching circuit
C. Four-wire feeder
D. Parallel feeder circuit
Correct Answer: B. Three-way switching circuit
Rationale: A three-way switching arrangement allows one lighting
load to be controlled from two different locations. It uses two
three-way switches connected through traveler conductors.
9. What is the primary purpose of a transformer?
A. Convert electrical energy into mechanical energy
B. Change AC voltage levels
C. Convert DC into mechanical energy
D. Eliminate all circuit losses
Correct Answer: B. Change AC voltage levels
Rationale: A transformer transfers electrical energy between
circuits through electromagnetic induction and can increase or
questions with correct answers
plus rationales 2026/2027 edition
with instant pdf download
1. Which electrical quantity represents the opposition to
current flow in a circuit?
A. Voltage
B. Power
C. Resistance
D. Frequency
Correct Answer: C. Resistance
Rationale: Resistance is the opposition a material or device
presents to the flow of electric current. It is measured in ohms
(Ω). According to Ohm's law, resistance can be calculated by
dividing voltage by current.
2. A 240-volt circuit supplies a 12-ohm heating load. What
current does the load draw?
A. 10 A
B. 20 A
C. 28.8 A
D. 40 A
Correct Answer: B. 20 A
,Rationale: Ohm's law states that current equals voltage divided by
resistance. Therefore, I = 240 V ÷ 12 Ω = 20 A.
3. What is the primary purpose of a circuit breaker?
A. Increase circuit voltage
B. Provide overcurrent protection
C. Improve power factor
D. Reduce conductor resistance
Correct Answer: B. Provide overcurrent protection
Rationale: A circuit breaker is designed to open a circuit
automatically when current exceeds its allowable rating. This
protects conductors and equipment from damage caused by
overloads and short circuits.
4. Which conductor is normally identified as the equipment
grounding conductor?
A. White
B. Gray
C. Green or bare
D. Orange
Correct Answer: C. Green or bare
Rationale: Equipment grounding conductors are commonly
identified by a continuous green covering, green with yellow
stripes where permitted, or by being bare. Their purpose is to
provide a low-impedance path for fault current.
,5. What is the main purpose of bonding?
A. Increase circuit voltage
B. Establish electrical continuity between conductive parts
C. Reduce conductor size
D. Increase equipment operating temperature
Correct Answer: B. Establish electrical continuity between
conductive parts
Rationale: Bonding connects normally non-current-carrying
conductive parts together so that fault current has an effective
path back to the source. This helps protective devices operate
quickly during faults.
6. A 120-volt load draws 15 amperes. What is its approximate
power consumption?
A. 800 W
B. 1,200 W
C. 1,800 W
D. 2,400 W
Correct Answer: C. 1,800 W
Rationale: For a resistive load, power is calculated as P = V × I.
Therefore, 120 V × 15 A = 1,800 watts.
7. What is the purpose of a grounding electrode system?
A. To carry normal load current
B. To establish a connection to earth for the electrical system
C. To increase circuit impedance
D. To replace overcurrent protection
, Correct Answer: B. To establish a connection to earth for the
electrical system
Rationale: A grounding electrode system connects the electrical
system to earth. It helps stabilize voltage to ground and provides a
path for certain electrical events such as lightning and surges, but
it is not intended to serve as the normal fault-current path.
8. Which type of circuit is commonly used to control a lighting
load from two locations?
A. Single-pole circuit
B. Three-way switching circuit
C. Four-wire feeder
D. Parallel feeder circuit
Correct Answer: B. Three-way switching circuit
Rationale: A three-way switching arrangement allows one lighting
load to be controlled from two different locations. It uses two
three-way switches connected through traveler conductors.
9. What is the primary purpose of a transformer?
A. Convert electrical energy into mechanical energy
B. Change AC voltage levels
C. Convert DC into mechanical energy
D. Eliminate all circuit losses
Correct Answer: B. Change AC voltage levels
Rationale: A transformer transfers electrical energy between
circuits through electromagnetic induction and can increase or
