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1. What is the minimum cover depth required for rigid metal conduit
under a residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rigid metal conduit requires at least 18 inches of cover when installed
under a driveway.
2. What is the purpose of a bonding jumper?
A. To carry load current
B. To ground equipment
C. To ensure electrical continuity between metal parts
D. To reduce voltage drop
Bonding jumpers maintain a low-impedance path to clear faults.
3. What color insulation is typically used for an equipment grounding
conductor?
A. White
B. Red
C. Green
,D. Black
Green insulation identifies equipment grounding conductors.
4. What device protects against ground faults?
A. AFCI
B. Circuit breaker
C. Fuse
D. GFCI
GFCIs detect current imbalance and protect against electric shock.
5. What is the maximum continuous load allowed on a 20-amp
circuit?
A. 10 amps
B. 15 amps
C. 16 amps
D. 20 amps
Continuous loads are limited to 80% of circuit rating.
6. What type of current flows in only one direction?
A. Alternating current
B. Pulsating current
C. Capacitive current
D. Direct current
Direct current flows in a single direction.
7. What does AWG stand for?
A. American Wiring Guide
, B. American Wire Gauge
C. Advanced Wire Group
D. Applied Wiring Grade
AWG is the standard sizing system for conductors.
8. What happens to resistance as conductor length increases?
A. Decreases
B. Stays the same
C. Increases
D. Becomes zero
Longer conductors have more resistance.
9. Which device is used to measure resistance?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. Ohmmeter
An ohmmeter measures resistance in ohms.
10. What is the voltage of a typical single-phase residential system?
A. 120V
B. 120/240V
C. 208V
D. 480V
Residential services supply both 120V and 240V.