NYC DCAS Electrician Exam Newest 2025-
2026 Updated Practice Exam | 150 Actual
Most Tested Questions Collections &
Verified Detailed Answers | Tutor Verified
Success Exam) Graded A+
1. What is the primary purpose of a circuit breaker in an electrical system? ✓
A. To increase voltage
B. To regulate current
C. To protect against overcurrent
D. To store electrical energy
Answer: C. To protect against overcurrent ✓
Rationale: Circuit breakers are designed to interrupt current flow when
overcurrent or short circuit conditions occur, preventing damage to
conductors and equipment.
2. According to the NEC, what does ampacity refer to? ✓
A. Maximum voltage
B. Maximum current a conductor can carry safely
C. Resistance level
D. Power consumption
Answer: B. Maximum current a conductor can carry safely ✓
Rationale: Ampacity is defined as the maximum current a conductor can
carry continuously without exceeding its temperature rating.
3. Which tool is used to measure electrical resistance? ✓
A. Voltmeter
B. Ammeter
C. Ohmmeter
, D. Wattmeter
Answer: C. Ohmmeter ✓
Rationale: An ohmmeter measures resistance in ohms, a key parameter in
diagnosing circuits.
4. What color insulation is typically used for grounded conductors? ✓
A. Green
B. Black
C. White
D. Red
Answer: C. White ✓
Rationale: The NEC identifies white or gray insulation as grounded
(neutral) conductors.
5. What is the formula for electrical power? ✓
A. P = I/R
B. P = V × I
C. P = V/R
D. P = I²/R
Answer: B. P = V × I ✓
Rationale: Electrical power is calculated by multiplying voltage by current.
6. A short circuit occurs when: ✓
A. Resistance increases
B. Current decreases
C. Current bypasses normal load path
D. Voltage drops to zero
Answer: C. Current bypasses normal load path ✓
Rationale: A short circuit creates a low-resistance path, causing excessive
current flow.
7. Which NEC article covers grounding and bonding? ✓
A. Article 110
B. Article 250
, C. Article 300
D. Article 400
Answer: B. Article 250 ✓
Rationale: Article 250 governs grounding and bonding requirements.
8. What device protects people from electric shock? ✓
A. Fuse
B. Transformer
C. GFCI
D. Relay
Answer: C. GFCI ✓
Rationale: A Ground-Fault Circuit Interrupter (GFCI) detects imbalance and
disconnects power quickly.
9. What is the unit of electrical resistance? ✓
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C. Ohm ✓
Rationale: Resistance is measured in ohms (Ω).
10.What type of current flows in one direction only? ✓
A. Alternating current
B. Direct current
C. Pulsating current
D. Reactive current
Answer: B. Direct current ✓
Rationale: Direct current (DC) flows in a single direction.
11.Which conductor is used for equipment grounding? ✓
A. Black
B. White
C. Green
, D. Red
Answer: C. Green ✓
Rationale: Green insulation identifies equipment grounding conductors.
12.What is voltage? ✓
A. Flow of electrons
B. Electrical pressure
C. Resistance to flow
D. Power usage
Answer: B. Electrical pressure ✓
Rationale: Voltage represents the force that pushes current through a
circuit.
13.What is the function of a transformer? ✓
A. Increase current only
B. Convert AC to DC
C. Change voltage levels
D. Store energy
Answer: C. Change voltage levels ✓
Rationale: Transformers adjust voltage levels while maintaining
frequency.
14.What is the purpose of a fuse? ✓
A. Increase voltage
B. Interrupt overcurrent
C. Store energy
D. Reduce resistance
Answer: B. Interrupt overcurrent ✓
Rationale: A fuse melts when excessive current flows, protecting the
circuit.
15.What is the unit of electrical current? ✓
A. Volt
B. Watt
2026 Updated Practice Exam | 150 Actual
Most Tested Questions Collections &
Verified Detailed Answers | Tutor Verified
Success Exam) Graded A+
1. What is the primary purpose of a circuit breaker in an electrical system? ✓
A. To increase voltage
B. To regulate current
C. To protect against overcurrent
D. To store electrical energy
Answer: C. To protect against overcurrent ✓
Rationale: Circuit breakers are designed to interrupt current flow when
overcurrent or short circuit conditions occur, preventing damage to
conductors and equipment.
2. According to the NEC, what does ampacity refer to? ✓
A. Maximum voltage
B. Maximum current a conductor can carry safely
C. Resistance level
D. Power consumption
Answer: B. Maximum current a conductor can carry safely ✓
Rationale: Ampacity is defined as the maximum current a conductor can
carry continuously without exceeding its temperature rating.
3. Which tool is used to measure electrical resistance? ✓
A. Voltmeter
B. Ammeter
C. Ohmmeter
, D. Wattmeter
Answer: C. Ohmmeter ✓
Rationale: An ohmmeter measures resistance in ohms, a key parameter in
diagnosing circuits.
4. What color insulation is typically used for grounded conductors? ✓
A. Green
B. Black
C. White
D. Red
Answer: C. White ✓
Rationale: The NEC identifies white or gray insulation as grounded
(neutral) conductors.
5. What is the formula for electrical power? ✓
A. P = I/R
B. P = V × I
C. P = V/R
D. P = I²/R
Answer: B. P = V × I ✓
Rationale: Electrical power is calculated by multiplying voltage by current.
6. A short circuit occurs when: ✓
A. Resistance increases
B. Current decreases
C. Current bypasses normal load path
D. Voltage drops to zero
Answer: C. Current bypasses normal load path ✓
Rationale: A short circuit creates a low-resistance path, causing excessive
current flow.
7. Which NEC article covers grounding and bonding? ✓
A. Article 110
B. Article 250
, C. Article 300
D. Article 400
Answer: B. Article 250 ✓
Rationale: Article 250 governs grounding and bonding requirements.
8. What device protects people from electric shock? ✓
A. Fuse
B. Transformer
C. GFCI
D. Relay
Answer: C. GFCI ✓
Rationale: A Ground-Fault Circuit Interrupter (GFCI) detects imbalance and
disconnects power quickly.
9. What is the unit of electrical resistance? ✓
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: C. Ohm ✓
Rationale: Resistance is measured in ohms (Ω).
10.What type of current flows in one direction only? ✓
A. Alternating current
B. Direct current
C. Pulsating current
D. Reactive current
Answer: B. Direct current ✓
Rationale: Direct current (DC) flows in a single direction.
11.Which conductor is used for equipment grounding? ✓
A. Black
B. White
C. Green
, D. Red
Answer: C. Green ✓
Rationale: Green insulation identifies equipment grounding conductors.
12.What is voltage? ✓
A. Flow of electrons
B. Electrical pressure
C. Resistance to flow
D. Power usage
Answer: B. Electrical pressure ✓
Rationale: Voltage represents the force that pushes current through a
circuit.
13.What is the function of a transformer? ✓
A. Increase current only
B. Convert AC to DC
C. Change voltage levels
D. Store energy
Answer: C. Change voltage levels ✓
Rationale: Transformers adjust voltage levels while maintaining
frequency.
14.What is the purpose of a fuse? ✓
A. Increase voltage
B. Interrupt overcurrent
C. Store energy
D. Reduce resistance
Answer: B. Interrupt overcurrent ✓
Rationale: A fuse melts when excessive current flows, protecting the
circuit.
15.What is the unit of electrical current? ✓
A. Volt
B. Watt
