NYC DCAS Electrician Exam Questions and
Answers 2026 | Complete 200 Question Test
Bank Study Guide PDF with Verified
Solutions
NYC DCAS Electrician Exam – 200 Question Test Bank Study Guide
• This guide presents 200 multiple-choice questions covering electrical theory,
NYC Electrical Code, wiring methods, motors, transformers, safety, and
municipal electrician duties, with the correct answer marked and explained
for self-paced review.
• Study one section at a time, attempt each question before checking the
marked answer, and use the EXPERT RATIONALE to reinforce the underlying
code rule or principle.
1. What is the basic unit of electrical resistance?
A. Ampere
B. Volt
C. Ohm
D. Watt
E. Henry
✓ Correct Answer: C. Ohm
EXPERT RATIONALE: The ohm is the SI unit of electrical resistance, representing
the opposition to current flow in a conductor.
2. According to Ohm's Law, if voltage increases while resistance remains
constant, current will:
A. Decrease
B. Remain the same
C. Increase
,D. Become zero
E. Become negative
✓ Correct Answer: C. Increase
EXPERT RATIONALE: Ohm's Law (I = V/R) shows current is directly proportional to
voltage; increasing voltage with constant resistance increases current.
3. What does the NEC stand for?
A. National Electric Council
B. National Electrical Code
C. New York Electrical Code
D. National Energy Commission
E. National Electric Conductor
✓ Correct Answer: B. National Electrical Code
EXPERT RATIONALE: The NEC (NFPA 70) is the standard for safe electrical
installation adopted and amended by NYC for local enforcement.
4. In a series circuit, the total resistance is:
A. The average of all resistances
B. The sum of all resistances
C. Always less than the smallest resistor
D. Equal to the largest resistor only
E. The reciprocal of the sum
✓ Correct Answer: B. The sum of all resistances
EXPERT RATIONALE: In series circuits, resistances add directly because current
flows through each component sequentially.
,5. What color is typically used for the grounded (neutral) conductor in a
120/240V system?
A. Black
B. Red
C. White or gray
D. Green
E. Blue
✓ Correct Answer: C. White or gray
EXPERT RATIONALE: NEC requires the grounded neutral conductor to be identified
with white or gray insulation for safe identification.
6. Which tool is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
E. Megohmmeter
✓ Correct Answer: B. Ammeter
EXPERT RATIONALE: An ammeter is connected in series with a circuit to directly
measure the flow of current in amperes.
7. What is the standard voltage for residential electrical service in NYC?
A. 110V single phase
B. 120/240V split phase
, C. 277V three phase
D. 480V three phase
E. 600V
✓ Correct Answer: B. 120/240V split phase
EXPERT RATIONALE: Most NYC residential services are 120/240V single-phase,
allowing both 120V branch circuits and 240V appliances.
8. The green or bare conductor in a wiring system is used for:
A. Hot/live connections
B. Neutral connections
C. Equipment grounding
D. Switching
E. Three-phase power
✓ Correct Answer: C. Equipment grounding
EXPERT RATIONALE: NEC mandates green or bare copper conductors be reserved
exclusively for equipment grounding to provide a safe fault path.
9. What is the purpose of a circuit breaker?
A. To increase voltage
B. To store electrical energy
C. To automatically interrupt current during overload or fault
D. To convert AC to DC
E. To measure resistance
✓ Correct Answer: C. To automatically interrupt current during overload or
fault
Answers 2026 | Complete 200 Question Test
Bank Study Guide PDF with Verified
Solutions
NYC DCAS Electrician Exam – 200 Question Test Bank Study Guide
• This guide presents 200 multiple-choice questions covering electrical theory,
NYC Electrical Code, wiring methods, motors, transformers, safety, and
municipal electrician duties, with the correct answer marked and explained
for self-paced review.
• Study one section at a time, attempt each question before checking the
marked answer, and use the EXPERT RATIONALE to reinforce the underlying
code rule or principle.
1. What is the basic unit of electrical resistance?
A. Ampere
B. Volt
C. Ohm
D. Watt
E. Henry
✓ Correct Answer: C. Ohm
EXPERT RATIONALE: The ohm is the SI unit of electrical resistance, representing
the opposition to current flow in a conductor.
2. According to Ohm's Law, if voltage increases while resistance remains
constant, current will:
A. Decrease
B. Remain the same
C. Increase
,D. Become zero
E. Become negative
✓ Correct Answer: C. Increase
EXPERT RATIONALE: Ohm's Law (I = V/R) shows current is directly proportional to
voltage; increasing voltage with constant resistance increases current.
3. What does the NEC stand for?
A. National Electric Council
B. National Electrical Code
C. New York Electrical Code
D. National Energy Commission
E. National Electric Conductor
✓ Correct Answer: B. National Electrical Code
EXPERT RATIONALE: The NEC (NFPA 70) is the standard for safe electrical
installation adopted and amended by NYC for local enforcement.
4. In a series circuit, the total resistance is:
A. The average of all resistances
B. The sum of all resistances
C. Always less than the smallest resistor
D. Equal to the largest resistor only
E. The reciprocal of the sum
✓ Correct Answer: B. The sum of all resistances
EXPERT RATIONALE: In series circuits, resistances add directly because current
flows through each component sequentially.
,5. What color is typically used for the grounded (neutral) conductor in a
120/240V system?
A. Black
B. Red
C. White or gray
D. Green
E. Blue
✓ Correct Answer: C. White or gray
EXPERT RATIONALE: NEC requires the grounded neutral conductor to be identified
with white or gray insulation for safe identification.
6. Which tool is used to measure electrical current?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
E. Megohmmeter
✓ Correct Answer: B. Ammeter
EXPERT RATIONALE: An ammeter is connected in series with a circuit to directly
measure the flow of current in amperes.
7. What is the standard voltage for residential electrical service in NYC?
A. 110V single phase
B. 120/240V split phase
, C. 277V three phase
D. 480V three phase
E. 600V
✓ Correct Answer: B. 120/240V split phase
EXPERT RATIONALE: Most NYC residential services are 120/240V single-phase,
allowing both 120V branch circuits and 240V appliances.
8. The green or bare conductor in a wiring system is used for:
A. Hot/live connections
B. Neutral connections
C. Equipment grounding
D. Switching
E. Three-phase power
✓ Correct Answer: C. Equipment grounding
EXPERT RATIONALE: NEC mandates green or bare copper conductors be reserved
exclusively for equipment grounding to provide a safe fault path.
9. What is the purpose of a circuit breaker?
A. To increase voltage
B. To store electrical energy
C. To automatically interrupt current during overload or fault
D. To convert AC to DC
E. To measure resistance
✓ Correct Answer: C. To automatically interrupt current during overload or
fault
