New York City DCAS Electrician Exam
(Civil Service) Practice Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the unit used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Rationale: Electrical current is measured in amperes (amps), which indicate the
flow of electrons through a conductor.
2. Ohm's Law states that voltage equals:
A. Current × Resistance
B. Current × Resistance
C. Power ÷ Current
D. Resistance ÷ Current
Rationale: Ohm's Law is expressed as V = I × R, where voltage equals current
multiplied by resistance.
3. Which device protects a circuit from overcurrent?
,A. Receptacle
B. Transformer
C. Switch
D. Circuit Breaker
Rationale: Circuit breakers automatically interrupt electrical flow when excessive
current is detected.
4. Electrical resistance is measured in:
A. Watts
B. Volts
C. Ohms
D. Amperes
Rationale: Resistance opposes current flow and is measured in ohms.
5. Which conductor is normally connected to earth ground?
A. Hot conductor
B. Traveler conductor
C. Grounding conductor
D. Switch leg
Rationale: Grounding conductors provide a safe path for fault current to earth.
6. A watt is a unit of:
A. Resistance
B. Voltage
C. Current
D. Power
Rationale: Power is measured in watts and equals voltage multiplied by current.
7. What color is typically used for grounded conductors?
A. Red
B. Blue
, C. Green
D. White
Rationale: White or gray insulation is commonly used for grounded (neutral)
conductors.
8. Which instrument measures voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Megger
Rationale: Voltmeters are designed to measure electrical potential difference.
9. The frequency of standard alternating current in the United States of
America is:
A. 50 Hz
B. 25 Hz
C. 60 Hz
D. 120 Hz
Rationale: Electrical systems in the United States of America operate at 60 hertz.
10.Which material is the best conductor?
A. Rubber
B. Glass
C. Wood
D. Copper
Rationale: Copper has excellent conductivity and is widely used in electrical
systems.
11.A short circuit occurs when:
A. Resistance increases
B. Voltage decreases
(Civil Service) Practice Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the unit used to measure electrical current?
A. Volt
B. Ohm
C. Ampere
D. Watt
Rationale: Electrical current is measured in amperes (amps), which indicate the
flow of electrons through a conductor.
2. Ohm's Law states that voltage equals:
A. Current × Resistance
B. Current × Resistance
C. Power ÷ Current
D. Resistance ÷ Current
Rationale: Ohm's Law is expressed as V = I × R, where voltage equals current
multiplied by resistance.
3. Which device protects a circuit from overcurrent?
,A. Receptacle
B. Transformer
C. Switch
D. Circuit Breaker
Rationale: Circuit breakers automatically interrupt electrical flow when excessive
current is detected.
4. Electrical resistance is measured in:
A. Watts
B. Volts
C. Ohms
D. Amperes
Rationale: Resistance opposes current flow and is measured in ohms.
5. Which conductor is normally connected to earth ground?
A. Hot conductor
B. Traveler conductor
C. Grounding conductor
D. Switch leg
Rationale: Grounding conductors provide a safe path for fault current to earth.
6. A watt is a unit of:
A. Resistance
B. Voltage
C. Current
D. Power
Rationale: Power is measured in watts and equals voltage multiplied by current.
7. What color is typically used for grounded conductors?
A. Red
B. Blue
, C. Green
D. White
Rationale: White or gray insulation is commonly used for grounded (neutral)
conductors.
8. Which instrument measures voltage?
A. Ammeter
B. Ohmmeter
C. Voltmeter
D. Megger
Rationale: Voltmeters are designed to measure electrical potential difference.
9. The frequency of standard alternating current in the United States of
America is:
A. 50 Hz
B. 25 Hz
C. 60 Hz
D. 120 Hz
Rationale: Electrical systems in the United States of America operate at 60 hertz.
10.Which material is the best conductor?
A. Rubber
B. Glass
C. Wood
D. Copper
Rationale: Copper has excellent conductivity and is widely used in electrical
systems.
11.A short circuit occurs when:
A. Resistance increases
B. Voltage decreases
