10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free MA-ME questions are organized by exam domain, so you can see how each part of the Massachusetts Master Electrician License Exam blueprint is tested. Reveal the answer and explanation under each question.
Domain 2: Advanced Elec Knowledge and Elec Theory
Question 1
Lights on one side of a 120/240 V single-phase installation become unusually bright while lights on the other side dim. A qualified electrician records 240 V from L1 to L2, 164 V from L1 to neutral, and 76 V from L2 to neutral. Changing a 120 V load makes the two line-to-neutral readings move in opposite directions, while line-to-line voltage stays steady. After isolating the affected circuits, which fault should the electrician investigate first?
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Correct answer: D - An open or high-resistance connection in the shared neutral.
Domain 3: Services
Question 2
A one-family dwelling qualifies for the 2023 NEC optional dwelling load calculation and will have one 120/240 V, three-wire service. Its general and appliance loads under 220.82(B) total 32,000 VA before demand factors. It also has 7,500 VA of air conditioning and 12,000 VA of electric space heating divided among three separately controlled units. Heating and cooling cannot operate simultaneously. All loads are accounted for. What is the smallest service-disconnect rating listed that meets the calculated load?
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Correct answer: C - 125 A
Domain 4: Grounding and Bonding
Question 3
Load testing of a 480 V to 208Y/120 V transformer installation reveals current on the equipment grounding conductor that rises and falls with the 120 V load. The transformer has its system bonding jumper at X0. A neutral and an equipment grounding conductor run to the secondary panel, where another jumper bonds the neutral to the cabinet. Insulation testing finds no conductor-to-enclosure fault. Once the installation is safely isolated, which correction removes the parallel normal-current path without sacrificing equipment grounding?
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Correct answer: A - Remove the panel's neutral bond while retaining its equipment grounding connection.
Domain 5: Wiring Methods and Devices
Question 4
A 50 A noncontinuous feeder uses 6 AWG copper THWN-2 conductors in a raceway containing six current-carrying conductors. Ambient temperature is 44°C, and all terminations are rated 75°C. The applicable table values are 65 A at 75°C and 75 A at 90°C; ambient correction factors are 0.82 and 0.87, respectively. The conductor-count adjustment factor is 0.80. No other adjustment applies. Using the 2023 NEC, what usable ampacity and sizing decision are correct?
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Correct answer: B - 52.2 A; the conductors have sufficient ampacity for the load.
Domain 6: Motors
Question 5
During a motor-circuit review, an apprentice notices that the inverse-time branch-circuit breaker has a higher ampere rating than the branch conductors. The ordinary continuous-duty motor has separate overload protection. The apprentice proposes replacing the breaker solely because of that rating difference. Which principle should guide the master's response?
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Correct answer: D - Separate overload protection can permit a branch breaker rating above conductor ampacity.
Domain 9: Special Occupancies and Equipment
Question 6
At a grain-transfer point, combustible grain dust is suspended in ignitible concentrations during normal operation. The project uses the NEC Class/Division classification system and limits the luminaire's marked maximum surface temperature to 150°C. All proposed luminaires have suitable ambient-temperature ratings. Which hazardous-location marking meets both the classification and temperature requirements?
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Correct answer: B - Class II, Division 1, Group G, T4
Domain 12: Alarm Systems
Question 7
Two acceptance-test findings are recorded for a properly configured fire alarm system: a sprinkler control valve is moved out of its normal open position, and an open is introduced into a supervised initiating-device circuit. No detector operates and no water flows. In the order described, how should the two conditions be classified?
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Correct answer: D - Supervisory signal; trouble signal.
Domain 13: Photovoltaic
Question 8
A PV module is rated 46.0 V open-circuit voltage and 38.0 V maximum-power voltage at a cell temperature of 25°C. Its manufacturer specifies a linear open-circuit-voltage temperature coefficient of -0.30% per °C. The design minimum temperature is -10°C, and the inverter's absolute maximum DC input is 600 V. Considering the cold-voltage limit alone, what is the greatest number of these modules that can be connected in one series string?
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Correct answer: A - 11 modules
More MA-ME practice questions
Question 9
The proprietor of a Massachusetts electrical contracting business has an active Class A license, but the proprietor's Class B license has expired. The business authorization remains valid, and its field electricians hold current Class B licenses. While the proprietor's Class B renewal is pending, which operating plan respects the distinction between the two licenses?
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Correct answer: A - Continue contracting under the Class A license, using current Class B licensees for installation.
Question 10
An architect answers a request for information by directing an electrical contractor to relocate switchgear. The contract permits the architect to clarify drawings but reserves approval of scope, price, and time changes to the owner through a written change order. The relocation is outside the contracted scope, no emergency exists, and unrelated rough-in can proceed without rework. How should the contractor handle today's work?
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Correct answer: C - Continue unaffected work; obtain the owner's signed change order before relocating the switchgear.