Electrical Contractor Exam (C-10) Actual
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Complete Questions and Correct
Detailed Answers| Brand New Version!
1. What is the primary purpose of an electrical grounding system?
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Answer: B
Rationale: Grounding provides a low-resistance path for fault current, helping
prevent shock and equipment damage.
2. What unit is used to measure electrical current?
A. Volt
B. Watt
C. Ampere
D. Ohm
Answer: C
Rationale: Electrical current is measured in amperes (amps).
3. What unit is used to measure voltage?
A. Volt
B. Watt
C. Ampere
D. Ohm
,Answer: A
Rationale: Voltage is measured in volts.
4. What unit is used to measure resistance?
A. Volt
B. Watt
C. Ampere
D. Ohm
Answer: D
Rationale: Resistance is measured in ohms.
5. Which law states that voltage equals current multiplied by resistance?
A. Kirchhoff's Law
B. Ohm's Law
C. Faraday's Law
D. Coulomb's Law
Answer: B
Rationale: Ohm's Law is expressed as V = I × R.
6. What does NEC stand for?
A. National Energy Code
B. National Electric Council
C. National Electrical Code
D. National Equipment Code
Answer: C
Rationale: NEC stands for National Electrical Code.
, 7. What is the primary purpose of a circuit breaker?
A. Increase current flow
B. Protect circuits from overcurrent
C. Increase voltage
D. Improve grounding
Answer: B
Rationale: Circuit breakers disconnect power during overloads or faults.
8. What is a short circuit?
A. Normal circuit operation
B. Unintended low-resistance current path
C. Proper grounding method
D. Voltage reduction device
Answer: B
Rationale: Short circuits create excessive current flow through unintended paths.
9. What is an electrical load?
A. Source of power
B. Device that consumes electrical energy
C. Grounding conductor
D. Service panel
Answer: B
Rationale: Loads use electrical energy to perform work.
10. What device measures electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Megger
Exam and Practice Tests Newest with
Complete Questions and Correct
Detailed Answers| Brand New Version!
1. What is the primary purpose of an electrical grounding system?
A. Increase voltage
B. Provide a safe path for fault current
C. Reduce wire size
D. Increase resistance
Answer: B
Rationale: Grounding provides a low-resistance path for fault current, helping
prevent shock and equipment damage.
2. What unit is used to measure electrical current?
A. Volt
B. Watt
C. Ampere
D. Ohm
Answer: C
Rationale: Electrical current is measured in amperes (amps).
3. What unit is used to measure voltage?
A. Volt
B. Watt
C. Ampere
D. Ohm
,Answer: A
Rationale: Voltage is measured in volts.
4. What unit is used to measure resistance?
A. Volt
B. Watt
C. Ampere
D. Ohm
Answer: D
Rationale: Resistance is measured in ohms.
5. Which law states that voltage equals current multiplied by resistance?
A. Kirchhoff's Law
B. Ohm's Law
C. Faraday's Law
D. Coulomb's Law
Answer: B
Rationale: Ohm's Law is expressed as V = I × R.
6. What does NEC stand for?
A. National Energy Code
B. National Electric Council
C. National Electrical Code
D. National Equipment Code
Answer: C
Rationale: NEC stands for National Electrical Code.
, 7. What is the primary purpose of a circuit breaker?
A. Increase current flow
B. Protect circuits from overcurrent
C. Increase voltage
D. Improve grounding
Answer: B
Rationale: Circuit breakers disconnect power during overloads or faults.
8. What is a short circuit?
A. Normal circuit operation
B. Unintended low-resistance current path
C. Proper grounding method
D. Voltage reduction device
Answer: B
Rationale: Short circuits create excessive current flow through unintended paths.
9. What is an electrical load?
A. Source of power
B. Device that consumes electrical energy
C. Grounding conductor
D. Service panel
Answer: B
Rationale: Loads use electrical energy to perform work.
10. What device measures electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Megger
