Minnesota Journey worker Electrician
Examination Questions and Correct Answers
(Verified Answers) Plus Rationale 2027 Q&A|
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1. What is the primary purpose of an overcurrent protective device in
an electrical circuit?
A. To increase circuit voltage
B. To improve power factor
C. To protect conductors and equipment from excessive current
D. To provide a disconnecting means only
Rationale: Overcurrent protective devices such as circuit breakers and
fuses limit excessive current caused by overloads or short circuits.
Their purpose is to protect conductors and connected equipment from
damage due to excessive heating.
,2. Which conductor is normally used to carry current back to the
source in a typical single-phase circuit?
A. Equipment grounding conductor
B. Bonding jumper
C. Grounding electrode conductor
D. Grounded (neutral) conductor
Rationale: The grounded conductor, commonly called the neutral,
provides the normal return path for current in many single-phase
circuits. The equipment grounding conductor is intended primarily to
provide a low-impedance fault-current path.
3. What is the minimum copper conductor size generally permitted for
a 20-ampere branch circuit under standard NEC provisions?
A. 16 AWG
B. 18 AWG
C. 12 AWG
D. 14 AWG
Rationale: Under the standard ampacity rules, 12 AWG copper is
commonly used for 20-ampere branch circuits. Actual conductor sizing
,must also consider temperature ratings, adjustment factors, ambient
temperature, and other applicable requirements.
4. Which device is specifically designed to provide personnel
protection from ground-fault current?
A. AFCI
B. Thermal overload relay
C. Surge protective device
D. GFCI
Rationale: A ground-fault circuit interrupter monitors current leaving
and returning through the circuit conductors. When it detects an
imbalance indicating leakage to ground, it rapidly interrupts the
circuit.
5. What is the main function of an equipment grounding conductor?
A. To carry normal neutral current
B. To regulate circuit voltage
C. To provide a low-impedance path for fault current
D. To increase circuit capacity
, Rationale: The equipment grounding conductor provides a path for
fault current back toward the source so that the overcurrent
protective device can operate promptly. It normally does not carry
load current.
6. Which formula is used to calculate electrical power in a simple DC
circuit?
A. P = I/R
B. P = R/I
C. P = V × I
D. P = V/R²
Rationale: Electrical power is calculated by multiplying voltage by
current. Thus, P = V × I, with power measured in watts when voltage is
in volts and current is in amperes.
7. A 120-volt circuit draws 10 amperes. Approximately how much
power is being consumed?
A. 12 watts
B. 120 watts
Examination Questions and Correct Answers
(Verified Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of an overcurrent protective device in
an electrical circuit?
A. To increase circuit voltage
B. To improve power factor
C. To protect conductors and equipment from excessive current
D. To provide a disconnecting means only
Rationale: Overcurrent protective devices such as circuit breakers and
fuses limit excessive current caused by overloads or short circuits.
Their purpose is to protect conductors and connected equipment from
damage due to excessive heating.
,2. Which conductor is normally used to carry current back to the
source in a typical single-phase circuit?
A. Equipment grounding conductor
B. Bonding jumper
C. Grounding electrode conductor
D. Grounded (neutral) conductor
Rationale: The grounded conductor, commonly called the neutral,
provides the normal return path for current in many single-phase
circuits. The equipment grounding conductor is intended primarily to
provide a low-impedance fault-current path.
3. What is the minimum copper conductor size generally permitted for
a 20-ampere branch circuit under standard NEC provisions?
A. 16 AWG
B. 18 AWG
C. 12 AWG
D. 14 AWG
Rationale: Under the standard ampacity rules, 12 AWG copper is
commonly used for 20-ampere branch circuits. Actual conductor sizing
,must also consider temperature ratings, adjustment factors, ambient
temperature, and other applicable requirements.
4. Which device is specifically designed to provide personnel
protection from ground-fault current?
A. AFCI
B. Thermal overload relay
C. Surge protective device
D. GFCI
Rationale: A ground-fault circuit interrupter monitors current leaving
and returning through the circuit conductors. When it detects an
imbalance indicating leakage to ground, it rapidly interrupts the
circuit.
5. What is the main function of an equipment grounding conductor?
A. To carry normal neutral current
B. To regulate circuit voltage
C. To provide a low-impedance path for fault current
D. To increase circuit capacity
, Rationale: The equipment grounding conductor provides a path for
fault current back toward the source so that the overcurrent
protective device can operate promptly. It normally does not carry
load current.
6. Which formula is used to calculate electrical power in a simple DC
circuit?
A. P = I/R
B. P = R/I
C. P = V × I
D. P = V/R²
Rationale: Electrical power is calculated by multiplying voltage by
current. Thus, P = V × I, with power measured in watts when voltage is
in volts and current is in amperes.
7. A 120-volt circuit draws 10 amperes. Approximately how much
power is being consumed?
A. 12 watts
B. 120 watts
