NYC Master Electrician Practice Questions & Solutions
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is an isolation transformer? - Correct Answer: A transformer that
isolates the output from the input for safety.
2. What is an autotransformer? - Correct Answer: A transformer that uses
a single continuous winding with tap points.
3. What is a current transformer? - Correct Answer: A transformer used to
measure alternating current.
4. What is a step-down delta transformer? - Correct Answer: A
transformer that reduces voltage from primary to secondary.
5. What is the purpose of a bleeder resistor? - Correct Answer: To provide
a high-resistance path across capacitor terminals to drain residual charges.
6. What type of conduit is prohibited from being installed in commercial
occupancies subject to physical abuse? - Correct Answer: Electrical
Nonmetallic Tubing (ENT)
,7. What size overcurrent protection device is required for a residential branch
circuit wired entirely with 12 AWG copper? - Correct Answer: 20
Amperes
8. What is the required minimum length for a standard ground ring electrode?
- Correct Answer: 20 feet
9. What instrument measures actual real power being consumed by an
operating electrical distribution system? - Correct Answer: Wattmeter
10.What is the phase-to-phase voltage of a standard commercial 480Y/277V
three-phase system? - Correct Answer: 480 Volts
11.What happens to the speed of a DC shunt motor if the field winding current
is completely lost while running? - Correct Answer: The motor speed
increases dangerously (runaway)
12.What is the minimum depth required for direct-burial cables under a
commercial parking lot? - Correct Answer: 24 inches
13.What type of box is used when conduits enter from the back or sides and an
extra depth is required? - Correct Answer: 4-inch square box
14.What type of load causes electrical current to lead the electrical voltage
wave? - Correct Answer: Capacitive load
,15.What color stripe identifies a high-leg conductor in a 240/120V 3-phase 4-
wire delta system? - Correct Answer: Orange
16.What is the multiplier for determining the minimum depth of a pull box
used for an angle or U-pull of conduits? - Correct Answer: 6 times the
largest raceway
17.What is the minimum number of 20-ampere laundry branch circuits
required in a newly constructed single-family dwelling? - Correct
Answer: 1 circuit
18.What safety hazard is a dual-element, time-delay fuse specifically designed
to handle? - Correct Answer: Temporary motor starting current surges
19.What is the primary operational advantage of installing aluminum
conductors instead of copper conductors? - Correct Answer: Lower
material cost and lighter weight
20.What is the total equivalent inductance of two 10-Henry inductors
connected in parallel? - Correct Answer: 5 Henries
21.What type of flexible metal conduit is specifically constructed with an
internal copper bonding strip? - Correct Answer: Type AC (Armored
Cable)
, 22.What does the term 'ampacity' refer to under electrical installation
standards? - Correct Answer: The maximum current a conductor can
carry continuously without exceeding its temperature rating.
23.What component of an electrical system is intended to safely interrupt low-
level arcing faults before a fire can ignite? - Correct Answer: AFCI
breaker
24.What size copper wire is required to supply a continuous load of 48
amperes? - Correct Answer: 6 AWG
25.What is the maximum distance allowed between supports for liquidtight
flexible metal conduit (LFMC) exceeding 1/2-inch trade size? - Correct
Answer: 4.5 feet
26.What specific type of environment is defined as one where flammable dust
is present in suspension under normal operational circumstances? -
Correct Answer: Class II, Division 1
27.What is the maximum threshold for a grounding system's resistance to
earth before a supplemental electrode must be installed? - Correct
Answer: 25 Ohms
28.What structural feature distinguishes a neutral conductor from an
equipment grounding conductor? - Correct Answer: The neutral carries
current during normal balanced operation; the ground only carries current
during a fault.
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is an isolation transformer? - Correct Answer: A transformer that
isolates the output from the input for safety.
2. What is an autotransformer? - Correct Answer: A transformer that uses
a single continuous winding with tap points.
3. What is a current transformer? - Correct Answer: A transformer used to
measure alternating current.
4. What is a step-down delta transformer? - Correct Answer: A
transformer that reduces voltage from primary to secondary.
5. What is the purpose of a bleeder resistor? - Correct Answer: To provide
a high-resistance path across capacitor terminals to drain residual charges.
6. What type of conduit is prohibited from being installed in commercial
occupancies subject to physical abuse? - Correct Answer: Electrical
Nonmetallic Tubing (ENT)
,7. What size overcurrent protection device is required for a residential branch
circuit wired entirely with 12 AWG copper? - Correct Answer: 20
Amperes
8. What is the required minimum length for a standard ground ring electrode?
- Correct Answer: 20 feet
9. What instrument measures actual real power being consumed by an
operating electrical distribution system? - Correct Answer: Wattmeter
10.What is the phase-to-phase voltage of a standard commercial 480Y/277V
three-phase system? - Correct Answer: 480 Volts
11.What happens to the speed of a DC shunt motor if the field winding current
is completely lost while running? - Correct Answer: The motor speed
increases dangerously (runaway)
12.What is the minimum depth required for direct-burial cables under a
commercial parking lot? - Correct Answer: 24 inches
13.What type of box is used when conduits enter from the back or sides and an
extra depth is required? - Correct Answer: 4-inch square box
14.What type of load causes electrical current to lead the electrical voltage
wave? - Correct Answer: Capacitive load
,15.What color stripe identifies a high-leg conductor in a 240/120V 3-phase 4-
wire delta system? - Correct Answer: Orange
16.What is the multiplier for determining the minimum depth of a pull box
used for an angle or U-pull of conduits? - Correct Answer: 6 times the
largest raceway
17.What is the minimum number of 20-ampere laundry branch circuits
required in a newly constructed single-family dwelling? - Correct
Answer: 1 circuit
18.What safety hazard is a dual-element, time-delay fuse specifically designed
to handle? - Correct Answer: Temporary motor starting current surges
19.What is the primary operational advantage of installing aluminum
conductors instead of copper conductors? - Correct Answer: Lower
material cost and lighter weight
20.What is the total equivalent inductance of two 10-Henry inductors
connected in parallel? - Correct Answer: 5 Henries
21.What type of flexible metal conduit is specifically constructed with an
internal copper bonding strip? - Correct Answer: Type AC (Armored
Cable)
, 22.What does the term 'ampacity' refer to under electrical installation
standards? - Correct Answer: The maximum current a conductor can
carry continuously without exceeding its temperature rating.
23.What component of an electrical system is intended to safely interrupt low-
level arcing faults before a fire can ignite? - Correct Answer: AFCI
breaker
24.What size copper wire is required to supply a continuous load of 48
amperes? - Correct Answer: 6 AWG
25.What is the maximum distance allowed between supports for liquidtight
flexible metal conduit (LFMC) exceeding 1/2-inch trade size? - Correct
Answer: 4.5 feet
26.What specific type of environment is defined as one where flammable dust
is present in suspension under normal operational circumstances? -
Correct Answer: Class II, Division 1
27.What is the maximum threshold for a grounding system's resistance to
earth before a supplemental electrode must be installed? - Correct
Answer: 25 Ohms
28.What structural feature distinguishes a neutral conductor from an
equipment grounding conductor? - Correct Answer: The neutral carries
current during normal balanced operation; the ground only carries current
during a fault.
