Minnesota Journeyman Electrician
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. What is the primary purpose of grounding in electrical systems?
A. To increase voltage
B. To provide a path for current during normal operation
C. To reduce energy consumption
D. To provide a safe path for fault current to earth
Grounding ensures that fault current has a low-resistance path to
earth, reducing the risk of electric shock and equipment damage.
2. According to the National Electrical Code (NEC), what is the maximum
allowable voltage for residential branch circuits?
A. 600 volts
B. 120/240 volts
C. 480 volts
, D. 208 volts
Residential systems in the U.S. typically operate at 120/240 volts as
defined by standard utility service.
3. What does ampacity refer to?
A. Voltage capacity
B. Resistance level
C. Maximum current a conductor can carry safely
D. Frequency rating
Ampacity is the safe current-carrying capacity of a conductor without
exceeding its temperature rating.
4. What type of circuit breaker trips instantly under high fault current?
A. Thermal breaker
B. Standard breaker
C. Magnetic breaker
D. Time-delay breaker
Magnetic breakers respond immediately to short circuits by detecting
high current spikes.
5. Which conductor is typically colored green or bare?
A. Neutral
B. Hot
C. Traveler
D. Grounding conductor
Green or bare conductors are designated for grounding purposes.
, 6. What is the function of a GFCI?
A. Protect against overload
B. Protect against ground faults
C. Increase current flow
D. Regulate voltage
Ground Fault Circuit Interrupters detect imbalance between hot and
neutral and trip quickly to prevent shock.
7. What NEC article covers general requirements for electrical
installations?
A. Article 110
B. Article 210
C. Article 110
D. Article 250
Article 110 outlines general requirements such as installation and
inspection standards.
8. What is the minimum burial depth for direct burial cable (UF) in
residential applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Direct burial cables typically require 24 inches of cover for protection.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of grounding in electrical systems?
A. To increase voltage
B. To provide a path for current during normal operation
C. To reduce energy consumption
D. To provide a safe path for fault current to earth
Grounding ensures that fault current has a low-resistance path to
earth, reducing the risk of electric shock and equipment damage.
2. According to the National Electrical Code (NEC), what is the maximum
allowable voltage for residential branch circuits?
A. 600 volts
B. 120/240 volts
C. 480 volts
, D. 208 volts
Residential systems in the U.S. typically operate at 120/240 volts as
defined by standard utility service.
3. What does ampacity refer to?
A. Voltage capacity
B. Resistance level
C. Maximum current a conductor can carry safely
D. Frequency rating
Ampacity is the safe current-carrying capacity of a conductor without
exceeding its temperature rating.
4. What type of circuit breaker trips instantly under high fault current?
A. Thermal breaker
B. Standard breaker
C. Magnetic breaker
D. Time-delay breaker
Magnetic breakers respond immediately to short circuits by detecting
high current spikes.
5. Which conductor is typically colored green or bare?
A. Neutral
B. Hot
C. Traveler
D. Grounding conductor
Green or bare conductors are designated for grounding purposes.
, 6. What is the function of a GFCI?
A. Protect against overload
B. Protect against ground faults
C. Increase current flow
D. Regulate voltage
Ground Fault Circuit Interrupters detect imbalance between hot and
neutral and trip quickly to prevent shock.
7. What NEC article covers general requirements for electrical
installations?
A. Article 110
B. Article 210
C. Article 110
D. Article 250
Article 110 outlines general requirements such as installation and
inspection standards.
8. What is the minimum burial depth for direct burial cable (UF) in
residential applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Direct burial cables typically require 24 inches of cover for protection.
