NYC DCAS Electrician Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
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1. What is the primary purpose of a ground fault circuit interrupter
(GFCI)?
A. Increase circuit voltage
B. Prevent overloads
C. Protect against electrical shock
D. Store electrical energy
Answer: C
Rationale: A GFCI detects differences between hot and neutral currents
and quickly shuts off power to prevent electric shock hazards, especially
in wet or damp environments.
2. According to the National Electrical Code (NEC), which color is
typically used for grounded conductors in DC systems?
,A. Red
B. Black
C. White
D. Green
Answer: C
Rationale: White or gray is commonly used to identify grounded
(neutral) conductors in AC and certain DC systems per NEC standards.
3. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C
Rationale: Resistance is measured in ohms (Ω), which indicates
opposition to current flow in a circuit.
4. Which device protects circuits from overcurrent conditions?
A. Transformer
B. Circuit breaker
,C. Resistor
D. Conduit
Answer: B
Rationale: Circuit breakers automatically interrupt current flow when
overloads or short circuits occur, protecting wiring and equipment.
5. What is the function of a transformer?
A. Convert mechanical energy to electrical
B. Change voltage levels through electromagnetic induction
C. Store electrical energy
D. Measure current flow
Answer: B
Rationale: Transformers transfer electrical energy between circuits and
step voltage up or down using electromagnetic induction.
6. What does Ohm’s Law state?
A. P = IV
B. V = IR
C. I = PR
D. R = VI
, Answer: B
Rationale: Ohm’s Law defines the relationship between voltage (V),
current (I), and resistance (R): V = I × R.
7. What is the standard voltage for residential outlets in New York
City?
A. 120V
B. 240V
C. 277V
D. 480V
Answer: A
Rationale: Standard residential receptacles in NYC supply approximately
120 volts AC.
8. What type of current flows in only one direction?
A. Alternating current
B. Direct current
C. Polyphase current
D. Reactive current
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary purpose of a ground fault circuit interrupter
(GFCI)?
A. Increase circuit voltage
B. Prevent overloads
C. Protect against electrical shock
D. Store electrical energy
Answer: C
Rationale: A GFCI detects differences between hot and neutral currents
and quickly shuts off power to prevent electric shock hazards, especially
in wet or damp environments.
2. According to the National Electrical Code (NEC), which color is
typically used for grounded conductors in DC systems?
,A. Red
B. Black
C. White
D. Green
Answer: C
Rationale: White or gray is commonly used to identify grounded
(neutral) conductors in AC and certain DC systems per NEC standards.
3. What is the unit of electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C
Rationale: Resistance is measured in ohms (Ω), which indicates
opposition to current flow in a circuit.
4. Which device protects circuits from overcurrent conditions?
A. Transformer
B. Circuit breaker
,C. Resistor
D. Conduit
Answer: B
Rationale: Circuit breakers automatically interrupt current flow when
overloads or short circuits occur, protecting wiring and equipment.
5. What is the function of a transformer?
A. Convert mechanical energy to electrical
B. Change voltage levels through electromagnetic induction
C. Store electrical energy
D. Measure current flow
Answer: B
Rationale: Transformers transfer electrical energy between circuits and
step voltage up or down using electromagnetic induction.
6. What does Ohm’s Law state?
A. P = IV
B. V = IR
C. I = PR
D. R = VI
, Answer: B
Rationale: Ohm’s Law defines the relationship between voltage (V),
current (I), and resistance (R): V = I × R.
7. What is the standard voltage for residential outlets in New York
City?
A. 120V
B. 240V
C. 277V
D. 480V
Answer: A
Rationale: Standard residential receptacles in NYC supply approximately
120 volts AC.
8. What type of current flows in only one direction?
A. Alternating current
B. Direct current
C. Polyphase current
D. Reactive current
