Minnesota Class A Master Electrician
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Question 1 — NEC Purpose
Which statement best describes the primary purpose of the National Electrical
Code?
A. To establish electrical utility rates
B. To regulate the training requirements for electricians
C. To provide practical safeguards for persons and property from hazards arising
from electrical installations
D. To establish uniform construction costs for electrical projects
Correct Answer: C. To provide practical safeguards for persons and property
from hazards arising from electrical installations
Rationale: The NEC is fundamentally a safety standard. Its purpose is to provide
practical safeguards against hazards associated with the use of electricity. It is not
intended to serve as a training curriculum, utility-rate manual, or cost-estimating
standard.
Question 2 — Approval of Equipment
,An electrical product is required by the NEC to be listed or labeled for a particular
application. Who has the authority to determine whether the product is
acceptable for that application?
A. The electrical contractor
B. The authority having jurisdiction
C. The equipment manufacturer
D. The property owner
Correct Answer: B. The authority having jurisdiction
Rationale: The authority having jurisdiction (AHJ) is responsible for interpreting
and enforcing the NEC and determining whether installations and equipment
comply with applicable requirements. A manufacturer's listing is important
evidence of suitability, but the AHJ has enforcement authority.
Question 3 — Working Space
The required working space in front of electrical equipment primarily exists to
provide:
A. Storage space for electrical tools
B. Room for future circuit expansion
C. Adequate access and safe working conditions around the equipment
D. A location for spare electrical conductors
Correct Answer: C. Adequate access and safe working conditions around the
equipment
Rationale: NEC working-space requirements are intended to provide sufficient
access and safe working room for operation, inspection, adjustment, and
maintenance of electrical equipment. The space should not be used as general
storage.
Question 4 — Electrical Connections
A conductor connection must be made using a method that is:
,A. Approved for the application and mechanically and electrically secure
B. Convenient for the installer regardless of listing
C. Made only with solder
D. Located inside the nearest available enclosure
Correct Answer: A. Approved for the application and mechanically and
electrically secure
Rationale: Electrical connections must be properly made using approved means
suitable for the conductors and equipment involved. Connections must provide
reliable mechanical and electrical continuity. Solder alone is not an acceptable
substitute for a proper mechanical connection.
Question 5 — Ohm's Law
A 24-ohm heating element is connected to a 120-volt source. What current does
the element draw?
A. 2 A
B. 4 A
C. 5 A
D. 10 A
Correct Answer: C. 5 A
Rationale: Ohm's law states that I = E ÷ R. Therefore, I = 120 ÷ 24 = 5 amperes.
Question 6 — Watt's Law
A single-phase resistive load operates at 240 volts and draws 12 amperes. What is
its power consumption?
A. 2,880 W
B. 1,440 W
C. 252 W
D. 20 W
Correct Answer: A. 2,880 W
, Rationale: For a unity-power-factor load, Watt's law gives P = E × I. Therefore, P =
240 × 12 = 2,880 watts.
Question 7 — Series Circuit
Three resistors rated at 10 ohms, 15 ohms, and 25 ohms are connected in series.
What is the total resistance?
A. 15 Ω
B. 25 Ω
C. 40 Ω
D. 50 Ω
Correct Answer: D. 50 Ω
Rationale: In a series circuit, individual resistance values are added. Thus, RT = 10
+ 15 + 25 = 50 ohms.
Question 8 — Parallel Circuit
Two 20-ohm resistors are connected in parallel. What is their combined
resistance?
A. 40 Ω
B. 20 Ω
C. 10 Ω
D. 5 Ω
Correct Answer: C. 10 Ω
Rationale: For two equal resistances in parallel, total resistance equals the
resistance of one branch divided by the number of branches. Therefore, RT = 20 ÷
2 = 10 ohms.
Question 9 — Three-Phase Power
Practice Exam Questions with Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1 — NEC Purpose
Which statement best describes the primary purpose of the National Electrical
Code?
A. To establish electrical utility rates
B. To regulate the training requirements for electricians
C. To provide practical safeguards for persons and property from hazards arising
from electrical installations
D. To establish uniform construction costs for electrical projects
Correct Answer: C. To provide practical safeguards for persons and property
from hazards arising from electrical installations
Rationale: The NEC is fundamentally a safety standard. Its purpose is to provide
practical safeguards against hazards associated with the use of electricity. It is not
intended to serve as a training curriculum, utility-rate manual, or cost-estimating
standard.
Question 2 — Approval of Equipment
,An electrical product is required by the NEC to be listed or labeled for a particular
application. Who has the authority to determine whether the product is
acceptable for that application?
A. The electrical contractor
B. The authority having jurisdiction
C. The equipment manufacturer
D. The property owner
Correct Answer: B. The authority having jurisdiction
Rationale: The authority having jurisdiction (AHJ) is responsible for interpreting
and enforcing the NEC and determining whether installations and equipment
comply with applicable requirements. A manufacturer's listing is important
evidence of suitability, but the AHJ has enforcement authority.
Question 3 — Working Space
The required working space in front of electrical equipment primarily exists to
provide:
A. Storage space for electrical tools
B. Room for future circuit expansion
C. Adequate access and safe working conditions around the equipment
D. A location for spare electrical conductors
Correct Answer: C. Adequate access and safe working conditions around the
equipment
Rationale: NEC working-space requirements are intended to provide sufficient
access and safe working room for operation, inspection, adjustment, and
maintenance of electrical equipment. The space should not be used as general
storage.
Question 4 — Electrical Connections
A conductor connection must be made using a method that is:
,A. Approved for the application and mechanically and electrically secure
B. Convenient for the installer regardless of listing
C. Made only with solder
D. Located inside the nearest available enclosure
Correct Answer: A. Approved for the application and mechanically and
electrically secure
Rationale: Electrical connections must be properly made using approved means
suitable for the conductors and equipment involved. Connections must provide
reliable mechanical and electrical continuity. Solder alone is not an acceptable
substitute for a proper mechanical connection.
Question 5 — Ohm's Law
A 24-ohm heating element is connected to a 120-volt source. What current does
the element draw?
A. 2 A
B. 4 A
C. 5 A
D. 10 A
Correct Answer: C. 5 A
Rationale: Ohm's law states that I = E ÷ R. Therefore, I = 120 ÷ 24 = 5 amperes.
Question 6 — Watt's Law
A single-phase resistive load operates at 240 volts and draws 12 amperes. What is
its power consumption?
A. 2,880 W
B. 1,440 W
C. 252 W
D. 20 W
Correct Answer: A. 2,880 W
, Rationale: For a unity-power-factor load, Watt's law gives P = E × I. Therefore, P =
240 × 12 = 2,880 watts.
Question 7 — Series Circuit
Three resistors rated at 10 ohms, 15 ohms, and 25 ohms are connected in series.
What is the total resistance?
A. 15 Ω
B. 25 Ω
C. 40 Ω
D. 50 Ω
Correct Answer: D. 50 Ω
Rationale: In a series circuit, individual resistance values are added. Thus, RT = 10
+ 15 + 25 = 50 ohms.
Question 8 — Parallel Circuit
Two 20-ohm resistors are connected in parallel. What is their combined
resistance?
A. 40 Ω
B. 20 Ω
C. 10 Ω
D. 5 Ω
Correct Answer: C. 10 Ω
Rationale: For two equal resistances in parallel, total resistance equals the
resistance of one branch divided by the number of branches. Therefore, RT = 20 ÷
2 = 10 ohms.
Question 9 — Three-Phase Power
