NYC Electrical Engineer Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the unit of electrical resistance?
A) Ampere
B) Volt
C) Ohm
D) Watt
Rationale: Resistance is measured in ohms (Ω), defined as the opposition to
current flow in a circuit.
2. Which law states that the current through a conductor between two
points is directly proportional to the voltage across the two points?
A) Faraday’s Law
, B) Ohm’s Law
C) Kirchhoff’s Current Law
D) Lenz’s Law
Rationale: Ohm’s Law defines the relationship V = IR, where V is voltage, I
is current, and R is resistance.
3. What is the phase difference between voltage and current in a purely
capacitive AC circuit?
A) 0°
B) 45°
C) 90°
D) -90°
Rationale: In a purely capacitive AC circuit, current leads voltage by 90°, or
equivalently, voltage lags current by 90°.
4. In a three-phase star (Y) connection, the line voltage is:
A) Equal to the phase voltage
B) Twice the phase voltage
C) √2 times the phase voltage
D) √3 times the phase voltage
Rationale: In a star connection, line voltage = √3 × phase voltage.
, 5. Which type of motor is commonly used in electric vehicles for high
efficiency?
A) Synchronous motor
B) Brushless DC motor
C) Shaded-pole motor
D) Induction motor
Rationale: Brushless DC motors are preferred in EVs for efficiency, high
torque, and low maintenance.
6. What is the primary purpose of a circuit breaker?
A) Step down voltage
B) Measure current
C) Protect circuits from overcurrent
D) Store energy
Rationale: Circuit breakers automatically disconnect the circuit when
current exceeds safe levels, preventing damage or fire.
7. The power factor of a circuit is defined as:
A) Active power / Reactive power
B) Active power / Apparent power
C) Reactive power / Active power
D) Apparent power / Active power
, Rationale: Power factor = P (active power) / S (apparent power), indicating
efficiency of power usage.
8. Which material has the highest electrical conductivity?
A) Aluminum
B) Copper
C) Iron
D) Tungsten
Rationale: Copper is widely used in electrical wiring due to its high
conductivity and ductility.
9. What is the primary function of a transformer?
A) Store energy
B) Convert AC to DC
C) Step up or step down AC voltage
D) Control current flow
Rationale: Transformers change AC voltage levels while keeping frequency
constant, using electromagnetic induction.
10. In an RLC series circuit at resonance, the impedance is:
A) Maximum
B) Minimum
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the unit of electrical resistance?
A) Ampere
B) Volt
C) Ohm
D) Watt
Rationale: Resistance is measured in ohms (Ω), defined as the opposition to
current flow in a circuit.
2. Which law states that the current through a conductor between two
points is directly proportional to the voltage across the two points?
A) Faraday’s Law
, B) Ohm’s Law
C) Kirchhoff’s Current Law
D) Lenz’s Law
Rationale: Ohm’s Law defines the relationship V = IR, where V is voltage, I
is current, and R is resistance.
3. What is the phase difference between voltage and current in a purely
capacitive AC circuit?
A) 0°
B) 45°
C) 90°
D) -90°
Rationale: In a purely capacitive AC circuit, current leads voltage by 90°, or
equivalently, voltage lags current by 90°.
4. In a three-phase star (Y) connection, the line voltage is:
A) Equal to the phase voltage
B) Twice the phase voltage
C) √2 times the phase voltage
D) √3 times the phase voltage
Rationale: In a star connection, line voltage = √3 × phase voltage.
, 5. Which type of motor is commonly used in electric vehicles for high
efficiency?
A) Synchronous motor
B) Brushless DC motor
C) Shaded-pole motor
D) Induction motor
Rationale: Brushless DC motors are preferred in EVs for efficiency, high
torque, and low maintenance.
6. What is the primary purpose of a circuit breaker?
A) Step down voltage
B) Measure current
C) Protect circuits from overcurrent
D) Store energy
Rationale: Circuit breakers automatically disconnect the circuit when
current exceeds safe levels, preventing damage or fire.
7. The power factor of a circuit is defined as:
A) Active power / Reactive power
B) Active power / Apparent power
C) Reactive power / Active power
D) Apparent power / Active power
, Rationale: Power factor = P (active power) / S (apparent power), indicating
efficiency of power usage.
8. Which material has the highest electrical conductivity?
A) Aluminum
B) Copper
C) Iron
D) Tungsten
Rationale: Copper is widely used in electrical wiring due to its high
conductivity and ductility.
9. What is the primary function of a transformer?
A) Store energy
B) Convert AC to DC
C) Step up or step down AC voltage
D) Control current flow
Rationale: Transformers change AC voltage levels while keeping frequency
constant, using electromagnetic induction.
10. In an RLC series circuit at resonance, the impedance is:
A) Maximum
B) Minimum
