NYC MASTER ELECTRICIAN LICENSE EXAM NEWEST EVALUATED EXAM
PRACTICE 100 QUESTIONS 2026-2027|ORIGINAL QUESTIONS & ANSWERS
|DETAILED RATIONALES |HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF*
1. A 120/208-volt, 3-phase, 4-wire system supplies a balanced load of 36
kW at unity power factor. What is the approximate line current?
A. 75 A
B. 100 A
C. 100 A
D. 173 A
Answer: C. 100 A
For a balanced three-phase load, I = P ÷ (√3 × V × PF) = 36,000 ÷ (1.732 × 208 ×
1) ≈ 100 A.
2. What is the primary purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To reduce the normal load current
Answer: C. To provide a low-impedance path for fault current
The equipment grounding conductor provides a path that facilitates operation
of the overcurrent protective device during a ground fault.
3. A continuous load is a load expected to operate for how long at
maximum current?
A. 1 hour or more
B. 2 hours or more
C. 3 hours or more
D. 4 hours or more
Answer: C. 3 hours or more
The NEC definition of a continuous load is a load where the maximum current
is expected to continue for 3 hours or more.
, 4. A circuit supplies a 40-ampere continuous load. What minimum ampere
rating is generally required for the branch-circuit overcurrent
protection?
A. 40 A
B. 45 A
C. 50 A
D. 60 A
Answer: C. 50 A
Continuous loads are generally calculated at 125 percent: 40 A × 1.25 = 50 A.
5. What is the main function of a circuit breaker?
A. Increase system voltage
B. Correct power factor
C. Protect conductors against overcurrent
D. Maintain constant frequency
Answer: C. Protect conductors against overcurrent
A circuit breaker opens the circuit when current exceeds its permitted value
under specified conditions.
6. A transformer has 480 volts on its primary and 120 volts on its
secondary. What is the approximate turns ratio primary-to-secondary?
A. 1:4
B. 2:1
C. 4:1
D. 8:1
Answer: C. 4:1
Transformer voltage ratio follows the turns ratio. 480 ÷ 120 = 4.
7. Which type of conductor is normally identified as the grounded
conductor in a typical AC power system?
A. Green
B. White or gray
C. Orange only
D. Bare copper only
, Answer: B. White or gray
The grounded circuit conductor is generally identified by white or gray
insulation or equivalent permitted identification.
8. Which conductor is normally permitted to be bare, covered, or insulated
and identified for equipment grounding?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Service neutral only
Answer: C. Equipment grounding conductor
Equipment grounding conductors may be bare, covered, or insulated as
permitted by the applicable requirements.
9. What is the primary purpose of a service disconnecting means?
A. Reduce harmonic current
B. Increase available fault current
C. Disconnect the building's electrical service from the source
D. Balance three-phase loads
Answer: C. Disconnect the building's electrical service from the source
The service disconnect provides a means of disconnecting the premises wiring
from the supply.
10.What is the approximate resistance of a circuit carrying 20 amperes at
120 volts?
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 10 Ω
Answer: C. 6 Ω
Using Ohm's law, R = V ÷ I = 120 ÷ 20 = 6 ohms.
11.What happens to current in a circuit when resistance increases while
voltage remains constant?
PRACTICE 100 QUESTIONS 2026-2027|ORIGINAL QUESTIONS & ANSWERS
|DETAILED RATIONALES |HINTED COMPLETE EXAM PREP GRADED
A+*INSTANT DOWNLOAD PDF*
1. A 120/208-volt, 3-phase, 4-wire system supplies a balanced load of 36
kW at unity power factor. What is the approximate line current?
A. 75 A
B. 100 A
C. 100 A
D. 173 A
Answer: C. 100 A
For a balanced three-phase load, I = P ÷ (√3 × V × PF) = 36,000 ÷ (1.732 × 208 ×
1) ≈ 100 A.
2. What is the primary purpose of an equipment grounding conductor?
A. To carry normal circuit current
B. To increase circuit voltage
C. To provide a low-impedance path for fault current
D. To reduce the normal load current
Answer: C. To provide a low-impedance path for fault current
The equipment grounding conductor provides a path that facilitates operation
of the overcurrent protective device during a ground fault.
3. A continuous load is a load expected to operate for how long at
maximum current?
A. 1 hour or more
B. 2 hours or more
C. 3 hours or more
D. 4 hours or more
Answer: C. 3 hours or more
The NEC definition of a continuous load is a load where the maximum current
is expected to continue for 3 hours or more.
, 4. A circuit supplies a 40-ampere continuous load. What minimum ampere
rating is generally required for the branch-circuit overcurrent
protection?
A. 40 A
B. 45 A
C. 50 A
D. 60 A
Answer: C. 50 A
Continuous loads are generally calculated at 125 percent: 40 A × 1.25 = 50 A.
5. What is the main function of a circuit breaker?
A. Increase system voltage
B. Correct power factor
C. Protect conductors against overcurrent
D. Maintain constant frequency
Answer: C. Protect conductors against overcurrent
A circuit breaker opens the circuit when current exceeds its permitted value
under specified conditions.
6. A transformer has 480 volts on its primary and 120 volts on its
secondary. What is the approximate turns ratio primary-to-secondary?
A. 1:4
B. 2:1
C. 4:1
D. 8:1
Answer: C. 4:1
Transformer voltage ratio follows the turns ratio. 480 ÷ 120 = 4.
7. Which type of conductor is normally identified as the grounded
conductor in a typical AC power system?
A. Green
B. White or gray
C. Orange only
D. Bare copper only
, Answer: B. White or gray
The grounded circuit conductor is generally identified by white or gray
insulation or equivalent permitted identification.
8. Which conductor is normally permitted to be bare, covered, or insulated
and identified for equipment grounding?
A. Ungrounded conductor
B. Grounded conductor
C. Equipment grounding conductor
D. Service neutral only
Answer: C. Equipment grounding conductor
Equipment grounding conductors may be bare, covered, or insulated as
permitted by the applicable requirements.
9. What is the primary purpose of a service disconnecting means?
A. Reduce harmonic current
B. Increase available fault current
C. Disconnect the building's electrical service from the source
D. Balance three-phase loads
Answer: C. Disconnect the building's electrical service from the source
The service disconnect provides a means of disconnecting the premises wiring
from the supply.
10.What is the approximate resistance of a circuit carrying 20 amperes at
120 volts?
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 10 Ω
Answer: C. 6 Ω
Using Ohm's law, R = V ÷ I = 120 ÷ 20 = 6 ohms.
11.What happens to current in a circuit when resistance increases while
voltage remains constant?
