NASCLA Electrical Contractor Exam100 QUESTIONS
FORM REAL EXAMS LATEST 2025 -2026 UPDATE
QUESTIONS & 100% CORRECT DETAILED ANSWERS
GRADED A+ (BRAND NEW!!)
1. What is the primary purpose of a grounding system in electrical installations?
A. To increase voltage
B. To reduce resistance
C. To provide a safe path for fault current
D. To improve efficiency
Grounding protects people and equipment by safely directing fault current to earth.
2. Which conductor is typically color-coded green or bare?
A. Neutral conductor
B. Hot conductor
C. Equipment grounding conductor
D. Traveler conductor
Green or bare wires are used for grounding to ensure safety.
3. What does NEC stand for?
A. National Electrical Code
B. National Energy Commission
C. National Electrical Code
D. National Electric Council
NEC sets standards for safe electrical installation.
4. What is the standard frequency of AC power in the United States?
A. 50 Hz
B. 25 Hz
C. 60 Hz
D. 120 Hz
The U.S. standard frequency is 60 cycles per second.
5. Which device is used to protect circuits from overload?
A. Transformer
B. Capacitor
C. Circuit breaker
D. Relay
Circuit breakers interrupt current during overload conditions.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Resistance is measured in ohms.
7. What does a GFCI protect against?
A. Overvoltage
B. Short circuits
, C. Ground faults
D. Power surges
GFCIs prevent electric shock by detecting imbalance in current.
8. Which material is commonly used for electrical conductors?
A. Plastic
B. Wood
C. Copper
D. Glass
Copper is widely used due to its excellent conductivity.
9. What is voltage?
A. Current flow
B. Resistance level
C. Electrical potential difference
D. Power usage
Voltage is the force that drives electric current.
10. What is the function of a transformer?
A. Store energy
B. Generate electricity
C. Change voltage levels
D. Measure resistance
Transformers step voltage up or down.
11. What is the unit of power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Power is measured in watts.
12. What type of current flows in one direction?
A. AC
B. Alternating
C. Pulsating
D. DC
Direct current flows in a single direction.
13. What is the function of a fuse?
A. Increase current
B. Store charge
C. Protect against overcurrent
D. Convert voltage
Fuses melt when excessive current flows.
14. What is the color of a neutral wire in most systems?
A. Red
B. Black
C. White
D. Green
White wires typically indicate neutral conductors.
FORM REAL EXAMS LATEST 2025 -2026 UPDATE
QUESTIONS & 100% CORRECT DETAILED ANSWERS
GRADED A+ (BRAND NEW!!)
1. What is the primary purpose of a grounding system in electrical installations?
A. To increase voltage
B. To reduce resistance
C. To provide a safe path for fault current
D. To improve efficiency
Grounding protects people and equipment by safely directing fault current to earth.
2. Which conductor is typically color-coded green or bare?
A. Neutral conductor
B. Hot conductor
C. Equipment grounding conductor
D. Traveler conductor
Green or bare wires are used for grounding to ensure safety.
3. What does NEC stand for?
A. National Electrical Code
B. National Energy Commission
C. National Electrical Code
D. National Electric Council
NEC sets standards for safe electrical installation.
4. What is the standard frequency of AC power in the United States?
A. 50 Hz
B. 25 Hz
C. 60 Hz
D. 120 Hz
The U.S. standard frequency is 60 cycles per second.
5. Which device is used to protect circuits from overload?
A. Transformer
B. Capacitor
C. Circuit breaker
D. Relay
Circuit breakers interrupt current during overload conditions.
6. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Watt
D. Ohm
Resistance is measured in ohms.
7. What does a GFCI protect against?
A. Overvoltage
B. Short circuits
, C. Ground faults
D. Power surges
GFCIs prevent electric shock by detecting imbalance in current.
8. Which material is commonly used for electrical conductors?
A. Plastic
B. Wood
C. Copper
D. Glass
Copper is widely used due to its excellent conductivity.
9. What is voltage?
A. Current flow
B. Resistance level
C. Electrical potential difference
D. Power usage
Voltage is the force that drives electric current.
10. What is the function of a transformer?
A. Store energy
B. Generate electricity
C. Change voltage levels
D. Measure resistance
Transformers step voltage up or down.
11. What is the unit of power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Power is measured in watts.
12. What type of current flows in one direction?
A. AC
B. Alternating
C. Pulsating
D. DC
Direct current flows in a single direction.
13. What is the function of a fuse?
A. Increase current
B. Store charge
C. Protect against overcurrent
D. Convert voltage
Fuses melt when excessive current flows.
14. What is the color of a neutral wire in most systems?
A. Red
B. Black
C. White
D. Green
White wires typically indicate neutral conductors.
