Wisconsin Master Electrician Industrial
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. Which NEC article provides the general requirements for grounding
and bonding?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: Article 250 contains the requirements for grounding, bonding,
grounding electrodes, grounding electrode conductors, and equipment
grounding conductors.
, 2. What is the primary purpose of bonding metal raceways?
A. Increase voltage
B. Reduce conductor resistance
C. Provide an effective ground-fault current path
D. Protect against lightning only
Answer: C. Provide an effective ground-fault current path
Rationale: Bonding ensures conductive parts remain electrically
continuous, allowing sufficient fault current to operate overcurrent
protective devices.
3. Which motor has the highest starting current?
A. Synchronous motor
B. Universal motor
C. Squirrel-cage induction motor
D. Stepper motor
Answer: C. Squirrel-cage induction motor
Rationale: Squirrel-cage induction motors commonly draw 5–8 times their
full-load current during starting.
4. Industrial motor branch-circuit short-circuit protection is generally
sized using which NEC article?
,A. Article 220
B. Article 430
C. Article 240 only
D. Article 310
Answer: B. Article 430
Rationale: Article 430 contains comprehensive requirements for motors,
motor circuits, controllers, disconnects, and overload protection.
5. What does a variable frequency drive primarily control?
A. Voltage only
B. Current only
C. Power factor only
D. Motor speed
Answer: D. Motor speed
Rationale: A VFD changes the supply frequency and voltage to regulate AC
motor speed.
6. A transformer changes voltage through the principle of:
A. Electrolysis
B. Resistance heating
, C. Electromagnetic induction
D. Rectification
Answer: C. Electromagnetic induction
Rationale: Transformers transfer energy between windings through
electromagnetic induction.
7. Which conductor carries fault current under normal operation?
A. Neutral conductor
B. Grounding electrode conductor
C. Equipment grounding conductor only during faults
D. Ground rod
Answer: C. Equipment grounding conductor only during faults
Rationale: The equipment grounding conductor carries current only during
ground-fault conditions.
8. Lockout/tagout procedures primarily protect workers from:
A. Fire hazards
B. Voltage drop
C. Unexpected energization
D. Equipment corrosion
Answer: C. Unexpected energization
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which NEC article provides the general requirements for grounding
and bonding?
A. Article 110
B. Article 250
C. Article 300
D. Article 430
Answer: B. Article 250
Rationale: Article 250 contains the requirements for grounding, bonding,
grounding electrodes, grounding electrode conductors, and equipment
grounding conductors.
, 2. What is the primary purpose of bonding metal raceways?
A. Increase voltage
B. Reduce conductor resistance
C. Provide an effective ground-fault current path
D. Protect against lightning only
Answer: C. Provide an effective ground-fault current path
Rationale: Bonding ensures conductive parts remain electrically
continuous, allowing sufficient fault current to operate overcurrent
protective devices.
3. Which motor has the highest starting current?
A. Synchronous motor
B. Universal motor
C. Squirrel-cage induction motor
D. Stepper motor
Answer: C. Squirrel-cage induction motor
Rationale: Squirrel-cage induction motors commonly draw 5–8 times their
full-load current during starting.
4. Industrial motor branch-circuit short-circuit protection is generally
sized using which NEC article?
,A. Article 220
B. Article 430
C. Article 240 only
D. Article 310
Answer: B. Article 430
Rationale: Article 430 contains comprehensive requirements for motors,
motor circuits, controllers, disconnects, and overload protection.
5. What does a variable frequency drive primarily control?
A. Voltage only
B. Current only
C. Power factor only
D. Motor speed
Answer: D. Motor speed
Rationale: A VFD changes the supply frequency and voltage to regulate AC
motor speed.
6. A transformer changes voltage through the principle of:
A. Electrolysis
B. Resistance heating
, C. Electromagnetic induction
D. Rectification
Answer: C. Electromagnetic induction
Rationale: Transformers transfer energy between windings through
electromagnetic induction.
7. Which conductor carries fault current under normal operation?
A. Neutral conductor
B. Grounding electrode conductor
C. Equipment grounding conductor only during faults
D. Ground rod
Answer: C. Equipment grounding conductor only during faults
Rationale: The equipment grounding conductor carries current only during
ground-fault conditions.
8. Lockout/tagout procedures primarily protect workers from:
A. Fire hazards
B. Voltage drop
C. Unexpected energization
D. Equipment corrosion
Answer: C. Unexpected energization
