CT Unlimited Electrical Journeyperson
(E-2) Exam – State Of Connecticut
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
Question 1
What is the primary purpose of grounding in an electrical system?
A. Increase circuit resistance
B. Reduce wire size requirements
C. Provide a low-resistance path to earth for fault current
D. Increase voltage stability
Correct Answer: C
Rationale: Grounding provides a safe, low-resistance path for fault current to
flow into the earth. This ensures that exposed conductive parts do not remain
energized during a fault condition, reducing the risk of electric shock and
equipment damage. It also helps protective devices such as breakers and fuses
operate quickly and effectively.
Question 2
According to general NEC principles, which device protects against overcurrent?
A. Transformer
B. Circuit breaker
,C. Conduit
D. Busbar
Correct Answer: B
Rationale: A circuit breaker is specifically designed to interrupt current flow
when an overcurrent condition occurs. This protects conductors and equipment
from overheating and potential fire hazards. Unlike passive components like
conduits or busbars, breakers actively respond to fault conditions.
Question 3
What is the standard color for a grounded (neutral) conductor in U.S. wiring
systems?
A. Green
B. Black
C. White or gray
D. Red
Correct Answer: C
Rationale: The National Electrical Code specifies that grounded conductors
(neutral) must be white or gray to ensure clear identification. This standard
reduces wiring errors and improves safety during installation and maintenance.
Question 4
Ohm’s Law is expressed as:
A. P = IV
B. V = IR
C. I = PR
D. R = VI
Correct Answer: B
,Rationale: Ohm’s Law defines the relationship between voltage, current, and
resistance, stating that voltage equals current multiplied by resistance (V = IR). It
is a foundational principle in electrical theory used to calculate circuit behavior.
Question 5
What is the function of a GFCI device?
A. Prevent overloads
B. Detect ground faults and shut off power
C. Increase circuit voltage
D. Reduce resistance in wiring
Correct Answer: B
Rationale: A Ground Fault Circuit Interrupter (GFCI) monitors the current balance
between hot and neutral conductors. If an imbalance is detected, indicating
current leakage to ground, it quickly disconnects power to prevent shock
hazards.
Question 6
Which tool is best for measuring current in a live conductor without disconnecting
it?
A. Multimeter in voltage mode
B. Clamp meter
C. Megohmmeter
D. Continuity tester
Correct Answer: B
Rationale: A clamp meter allows measurement of current flow by sensing the
magnetic field around a conductor without breaking the circuit. This makes it
ideal for safe live testing.
, Question 7
What does NEC stand for?
A. National Electrical Code
B. National Energy Control
C. Network Electrical Commission
D. National Engineering Circuit
Correct Answer: A
Rationale: NEC stands for National Electrical Code, which is a standardized set of
regulations governing safe electrical installation practices in the United States.
Question 8
What is the purpose of a transformer?
A. Store electrical energy
B. Change AC voltage levels
C. Convert AC to DC
D. Limit current flow
Correct Answer: B
Rationale: A transformer operates on electromagnetic induction to increase
(step-up) or decrease (step-down) alternating current voltage levels while
maintaining power balance (minus losses).
Question 9
Which material is commonly used for electrical conductors?
A. Rubber
B. Copper
C. Glass
D. PVC
Correct Answer: B
(E-2) Exam – State Of Connecticut
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
Question 1
What is the primary purpose of grounding in an electrical system?
A. Increase circuit resistance
B. Reduce wire size requirements
C. Provide a low-resistance path to earth for fault current
D. Increase voltage stability
Correct Answer: C
Rationale: Grounding provides a safe, low-resistance path for fault current to
flow into the earth. This ensures that exposed conductive parts do not remain
energized during a fault condition, reducing the risk of electric shock and
equipment damage. It also helps protective devices such as breakers and fuses
operate quickly and effectively.
Question 2
According to general NEC principles, which device protects against overcurrent?
A. Transformer
B. Circuit breaker
,C. Conduit
D. Busbar
Correct Answer: B
Rationale: A circuit breaker is specifically designed to interrupt current flow
when an overcurrent condition occurs. This protects conductors and equipment
from overheating and potential fire hazards. Unlike passive components like
conduits or busbars, breakers actively respond to fault conditions.
Question 3
What is the standard color for a grounded (neutral) conductor in U.S. wiring
systems?
A. Green
B. Black
C. White or gray
D. Red
Correct Answer: C
Rationale: The National Electrical Code specifies that grounded conductors
(neutral) must be white or gray to ensure clear identification. This standard
reduces wiring errors and improves safety during installation and maintenance.
Question 4
Ohm’s Law is expressed as:
A. P = IV
B. V = IR
C. I = PR
D. R = VI
Correct Answer: B
,Rationale: Ohm’s Law defines the relationship between voltage, current, and
resistance, stating that voltage equals current multiplied by resistance (V = IR). It
is a foundational principle in electrical theory used to calculate circuit behavior.
Question 5
What is the function of a GFCI device?
A. Prevent overloads
B. Detect ground faults and shut off power
C. Increase circuit voltage
D. Reduce resistance in wiring
Correct Answer: B
Rationale: A Ground Fault Circuit Interrupter (GFCI) monitors the current balance
between hot and neutral conductors. If an imbalance is detected, indicating
current leakage to ground, it quickly disconnects power to prevent shock
hazards.
Question 6
Which tool is best for measuring current in a live conductor without disconnecting
it?
A. Multimeter in voltage mode
B. Clamp meter
C. Megohmmeter
D. Continuity tester
Correct Answer: B
Rationale: A clamp meter allows measurement of current flow by sensing the
magnetic field around a conductor without breaking the circuit. This makes it
ideal for safe live testing.
, Question 7
What does NEC stand for?
A. National Electrical Code
B. National Energy Control
C. Network Electrical Commission
D. National Engineering Circuit
Correct Answer: A
Rationale: NEC stands for National Electrical Code, which is a standardized set of
regulations governing safe electrical installation practices in the United States.
Question 8
What is the purpose of a transformer?
A. Store electrical energy
B. Change AC voltage levels
C. Convert AC to DC
D. Limit current flow
Correct Answer: B
Rationale: A transformer operates on electromagnetic induction to increase
(step-up) or decrease (step-down) alternating current voltage levels while
maintaining power balance (minus losses).
Question 9
Which material is commonly used for electrical conductors?
A. Rubber
B. Copper
C. Glass
D. PVC
Correct Answer: B
