NYC DCAS Electrician Exam Questions With
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following is the standard voltage for residential
electrical service in New York City?
A) 120/208 V
B) 120/240 V
C) 240/480 V
D) 277/480 V
B) 120/240 V
This is the standard single-phase voltage supplied to most
residential buildings in NYC.
2. The primary function of a circuit breaker is to:
A) Step up voltage
B) Protect a circuit from overcurrent
C) Measure current
D) Convert AC to DC
B) Protect a circuit from overcurrent
Circuit breakers prevent overheating and potential fires by
interrupting current flow during overloads.
3. In electrical wiring, the color green is used for:
A) Neutral conductors
B) Hot conductors
C) Grounding conductors
D) None of the above
C) Grounding conductors
, Green (or bare) wires indicate grounding to prevent electrical
shock.
4. A transformer converts:
A) AC to DC
B) AC to AC at a different voltage
C) DC to AC
D) Current to resistance
B) AC to AC at a different voltage
Transformers change voltage levels without altering the type of
current.
5. Ohm’s Law states that:
A) V = I × R
B) P = V × I
C) I = P × V
D) R = V × P
A) V = I × R
Voltage equals current multiplied by resistance in a simple circuit.
6. The main purpose of a GFCI outlet is to:
A) Reduce energy consumption
B) Prevent electrocution
C) Control voltage
D) Regulate current
B) Prevent electrocution
GFCIs detect small current leaks to ground and shut off power to
reduce shock hazards.
7. Which device is used to measure current in a circuit?
A) Voltmeter
, B) Ammeter
C) Ohmmeter
D) Wattmeter
B) Ammeter
Ammeters measure the flow of electrical current in amperes.
8. The NEC requires that all metal boxes be:
A) Painted
B) Grounded
C) Insulated
D) Dry
B) Grounded
Grounding metal boxes ensures safety against electrical faults.
9. In a 3-phase system, the voltage between any two lines is:
A) Equal to the line-to-neutral voltage
B) √3 times the line-to-neutral voltage
C) Half the line-to-neutral voltage
D) Double the line-to-neutral voltage
B) √3 times the line-to-neutral voltage
This is a property of three-phase electrical systems.
10. When using conduit for wiring, the wires must:
A) Be loosely packed
B) Fill the conduit to 100% capacity
C) Comply with fill capacity regulations
D) Be uninsulated
C) Comply with fill capacity regulations
Exceeding conduit fill limits can cause overheating and make
maintenance difficult.
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download Pdf
1. Which of the following is the standard voltage for residential
electrical service in New York City?
A) 120/208 V
B) 120/240 V
C) 240/480 V
D) 277/480 V
B) 120/240 V
This is the standard single-phase voltage supplied to most
residential buildings in NYC.
2. The primary function of a circuit breaker is to:
A) Step up voltage
B) Protect a circuit from overcurrent
C) Measure current
D) Convert AC to DC
B) Protect a circuit from overcurrent
Circuit breakers prevent overheating and potential fires by
interrupting current flow during overloads.
3. In electrical wiring, the color green is used for:
A) Neutral conductors
B) Hot conductors
C) Grounding conductors
D) None of the above
C) Grounding conductors
, Green (or bare) wires indicate grounding to prevent electrical
shock.
4. A transformer converts:
A) AC to DC
B) AC to AC at a different voltage
C) DC to AC
D) Current to resistance
B) AC to AC at a different voltage
Transformers change voltage levels without altering the type of
current.
5. Ohm’s Law states that:
A) V = I × R
B) P = V × I
C) I = P × V
D) R = V × P
A) V = I × R
Voltage equals current multiplied by resistance in a simple circuit.
6. The main purpose of a GFCI outlet is to:
A) Reduce energy consumption
B) Prevent electrocution
C) Control voltage
D) Regulate current
B) Prevent electrocution
GFCIs detect small current leaks to ground and shut off power to
reduce shock hazards.
7. Which device is used to measure current in a circuit?
A) Voltmeter
, B) Ammeter
C) Ohmmeter
D) Wattmeter
B) Ammeter
Ammeters measure the flow of electrical current in amperes.
8. The NEC requires that all metal boxes be:
A) Painted
B) Grounded
C) Insulated
D) Dry
B) Grounded
Grounding metal boxes ensures safety against electrical faults.
9. In a 3-phase system, the voltage between any two lines is:
A) Equal to the line-to-neutral voltage
B) √3 times the line-to-neutral voltage
C) Half the line-to-neutral voltage
D) Double the line-to-neutral voltage
B) √3 times the line-to-neutral voltage
This is a property of three-phase electrical systems.
10. When using conduit for wiring, the wires must:
A) Be loosely packed
B) Fill the conduit to 100% capacity
C) Comply with fill capacity regulations
D) Be uninsulated
C) Comply with fill capacity regulations
Exceeding conduit fill limits can cause overheating and make
maintenance difficult.
