DIR – General Electrician Certification
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of an overcurrent protective device
such as a circuit breaker?
A. To increase circuit voltage
B. To regulate power factor
C. To protect conductors and equipment from excessive current
D. To provide a grounding electrode
Rationale: An overcurrent protective device opens the circuit when
current exceeds a safe level. This helps prevent conductor overheating,
insulation damage, equipment failure, and electrical fires.
2. What is the standard unit used to measure electrical resistance?
A. Volt
B. Ohm
,C. Ampere
D. Watt
Rationale: Resistance is measured in ohms (Ω). Voltage is measured in
volts, current in amperes, and power in watts.
3. According to Ohm's law, what is the current in a circuit supplied
by 120 volts with a resistance of 20 ohms?
A. 2 A
B. 4 A
C. 6 A
D. 10 A
Rationale: Ohm's law states I = E/R. Therefore, 120 volts ÷ 20 ohms = 6
amperes.
4. What is the primary function of the equipment grounding
conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To reduce electrical resistance
D. To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides a conductive
path for fault current back to the source so that the overcurrent
protective device can operate promptly.
5. Which conductor is normally identified by white or gray insulation
in a typical AC circuit?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Grounding electrode conductor
Rationale: The grounded conductor, commonly called the neutral, is
generally identified by white or gray insulation. Identification
requirements must be followed throughout the electrical installation.
6. What is the electrical power consumed by a 120-volt load drawing
10 amperes?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
Rationale: For a simple resistive load, power is calculated as P = E × I.
Thus, 120 V × 10 A = 1,200 watts.
, 7. What is the main purpose of a disconnecting means?
A. To increase available fault current
B. To provide circuit grounding
C. To disconnect electrical equipment from its source of supply
D. To regulate conductor temperature
Rationale: A disconnecting means allows equipment or circuits to be
isolated from their electrical source for servicing, maintenance, or
emergency purposes.
8. Which type of circuit is normally used for general-purpose
receptacles and lighting in a dwelling?
A. Series circuit
B. Parallel circuit
C. Open circuit
D. Short circuit
Rationale: Branch circuits supplying multiple loads are generally
arranged in parallel. Each load receives the appropriate supply voltage
independently of the operation of other loads.
9. What happens to total resistance when resistors are connected in
series?
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of an overcurrent protective device
such as a circuit breaker?
A. To increase circuit voltage
B. To regulate power factor
C. To protect conductors and equipment from excessive current
D. To provide a grounding electrode
Rationale: An overcurrent protective device opens the circuit when
current exceeds a safe level. This helps prevent conductor overheating,
insulation damage, equipment failure, and electrical fires.
2. What is the standard unit used to measure electrical resistance?
A. Volt
B. Ohm
,C. Ampere
D. Watt
Rationale: Resistance is measured in ohms (Ω). Voltage is measured in
volts, current in amperes, and power in watts.
3. According to Ohm's law, what is the current in a circuit supplied
by 120 volts with a resistance of 20 ohms?
A. 2 A
B. 4 A
C. 6 A
D. 10 A
Rationale: Ohm's law states I = E/R. Therefore, 120 volts ÷ 20 ohms = 6
amperes.
4. What is the primary function of the equipment grounding
conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To reduce electrical resistance
D. To provide a low-impedance path for fault current
,Rationale: The equipment grounding conductor provides a conductive
path for fault current back to the source so that the overcurrent
protective device can operate promptly.
5. Which conductor is normally identified by white or gray insulation
in a typical AC circuit?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Grounding electrode conductor
Rationale: The grounded conductor, commonly called the neutral, is
generally identified by white or gray insulation. Identification
requirements must be followed throughout the electrical installation.
6. What is the electrical power consumed by a 120-volt load drawing
10 amperes?
A. 12 W
B. 120 W
C. 1,200 W
D. 12,000 W
Rationale: For a simple resistive load, power is calculated as P = E × I.
Thus, 120 V × 10 A = 1,200 watts.
, 7. What is the main purpose of a disconnecting means?
A. To increase available fault current
B. To provide circuit grounding
C. To disconnect electrical equipment from its source of supply
D. To regulate conductor temperature
Rationale: A disconnecting means allows equipment or circuits to be
isolated from their electrical source for servicing, maintenance, or
emergency purposes.
8. Which type of circuit is normally used for general-purpose
receptacles and lighting in a dwelling?
A. Series circuit
B. Parallel circuit
C. Open circuit
D. Short circuit
Rationale: Branch circuits supplying multiple loads are generally
arranged in parallel. Each load receives the appropriate supply voltage
independently of the operation of other loads.
9. What happens to total resistance when resistors are connected in
series?
