TEXAS JOURNEYMAN ELECTRICIAN EXAM
1. What is the primary purpose of grounding electrical
systems?
A. To increase voltage
B. To reduce resistance
C. To provide a safe path for fault current
D. To balance electrical loads
Rationale: Grounding protects people and equipment by
directing fault current safely to earth, reducing the risk of shock,
fire, and equipment damage.
2. According to the NEC, what is the minimum working
clearance in front of electrical equipment operating at 0–
150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Rationale: NEC 110.26 requires a minimum of 3 feet (36 inches)
of working clearance in front of equipment operating at 0–150
volts to ground under normal conditions.
3. What device is used to protect a circuit from overload
conditions?
A. Transformer
B. Relay
C. Circuit breaker
D. Capacitor
Rationale: Circuit breakers automatically interrupt current flow
when excessive current is detected, preventing overheating and
fire hazards.
, 4. Which conductor is typically identified by white or gray
insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Traveler conductor
D. Grounded conductor (neutral)
Rationale: NEC identifies grounded conductors, commonly
neutrals, with white or gray insulation.
5. What does GFCI stand for?
A. Ground Fault Circuit Interruptor
B. Ground Fuse Circuit Indicator
C. Ground Fault Circuit Interrupter
D. Ground Function Circuit Integrator
Rationale: A GFCI protects against electric shock by detecting
differences between outgoing and returning current.
6. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 250
Rationale: NEC Article 250 establishes requirements for
grounding and bonding electrical systems.
7. What is the formula for electrical power?
A. P = I ÷ E
B. P = E × I
C. P = E ÷ R
D. P = R × I²
Rationale: Electrical power in watts equals voltage multiplied by
current.
, 8. What type of motor is commonly used in residential HVAC
systems?
A. Synchronous motor
B. Universal motor
C. Single-phase induction motor
D. DC shunt motor
Rationale: Single-phase induction motors are reliable and
commonly used in residential HVAC applications.
9. What is the minimum cover depth for direct-buried UF
cable under a residential driveway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: NEC Table 300.5 specifies 24 inches of cover for
direct-buried cable beneath driveways.
10. What tool measures electrical resistance?
A. Ammeter
B. Wattmeter
C. Voltmeter
D. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms within
electrical circuits and components.
11. Which color is commonly used for equipment
grounding conductors?
A. White
B. Red
C. Blue
D. Green
1. What is the primary purpose of grounding electrical
systems?
A. To increase voltage
B. To reduce resistance
C. To provide a safe path for fault current
D. To balance electrical loads
Rationale: Grounding protects people and equipment by
directing fault current safely to earth, reducing the risk of shock,
fire, and equipment damage.
2. According to the NEC, what is the minimum working
clearance in front of electrical equipment operating at 0–
150 volts to ground?
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Rationale: NEC 110.26 requires a minimum of 3 feet (36 inches)
of working clearance in front of equipment operating at 0–150
volts to ground under normal conditions.
3. What device is used to protect a circuit from overload
conditions?
A. Transformer
B. Relay
C. Circuit breaker
D. Capacitor
Rationale: Circuit breakers automatically interrupt current flow
when excessive current is detected, preventing overheating and
fire hazards.
, 4. Which conductor is typically identified by white or gray
insulation?
A. Equipment grounding conductor
B. Ungrounded conductor
C. Traveler conductor
D. Grounded conductor (neutral)
Rationale: NEC identifies grounded conductors, commonly
neutrals, with white or gray insulation.
5. What does GFCI stand for?
A. Ground Fault Circuit Interruptor
B. Ground Fuse Circuit Indicator
C. Ground Fault Circuit Interrupter
D. Ground Function Circuit Integrator
Rationale: A GFCI protects against electric shock by detecting
differences between outgoing and returning current.
6. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 210
C. Article 250
D. Article 250
Rationale: NEC Article 250 establishes requirements for
grounding and bonding electrical systems.
7. What is the formula for electrical power?
A. P = I ÷ E
B. P = E × I
C. P = E ÷ R
D. P = R × I²
Rationale: Electrical power in watts equals voltage multiplied by
current.
, 8. What type of motor is commonly used in residential HVAC
systems?
A. Synchronous motor
B. Universal motor
C. Single-phase induction motor
D. DC shunt motor
Rationale: Single-phase induction motors are reliable and
commonly used in residential HVAC applications.
9. What is the minimum cover depth for direct-buried UF
cable under a residential driveway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: NEC Table 300.5 specifies 24 inches of cover for
direct-buried cable beneath driveways.
10. What tool measures electrical resistance?
A. Ammeter
B. Wattmeter
C. Voltmeter
D. Ohmmeter
Rationale: An ohmmeter measures resistance in ohms within
electrical circuits and components.
11. Which color is commonly used for equipment
grounding conductors?
A. White
B. Red
C. Blue
D. Green
