AZ ROC CR-11 Electrical Contractor Examination
(Dual Residential & Commercial) Questions and
Correct Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
Question 1
What is the primary purpose of an overcurrent protective device such
as a circuit breaker?
A. To increase circuit voltage
B. To improve power factor
C. To protect conductors and equipment from excessive current
D. To provide a path for normal current to ground
Rationale: An overcurrent protective device opens a circuit when
current exceeds the permitted level. This helps prevent conductor
overheating, insulation damage, equipment damage, and fire
hazards. Circuit breakers and fuses are designed primarily for
overcurrent protection, not for increasing voltage or improving power
factor.
,Question 2
A 120-volt load draws 10 amperes. What is the approximate power
consumed by the load?
A. 12 watts
B. 100 watts
C. 1,200 watts
D. 12,000 watts
Rationale: Electrical power in a single-phase circuit can be calculated
using P = V × I. Therefore, 120 volts × 10 amperes = 1,200 watts. This
relationship is fundamental when sizing circuits and estimating
electrical loads.
Question 3
Which conductor normally carries current back from a 120-volt load to
the source?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded conductor
D. Bonding jumper
,Rationale: In a typical 120-volt circuit, the grounded conductor,
commonly called the neutral, provides the return path for current
from the load to the source. The equipment grounding conductor
normally does not carry current during normal operation.
Question 4
What is the primary function of an equipment grounding conductor?
A. Carry normal circuit current
B. Increase circuit voltage
C. Provide a low-impedance path for fault current
D. Reduce the resistance of the load
Rationale: The equipment grounding conductor provides a conductive
path intended to carry fault current back toward the source so that
the overcurrent protective device can operate promptly. It is not
intended to carry normal load current.
Question 5
Which material is commonly used for residential branch-circuit
conductors?
, A. Lead
B. Zinc
C. Copper
D. Cast iron
Rationale: Copper is widely used for electrical conductors because it
has excellent conductivity, mechanical strength, and corrosion
resistance. Aluminum is also permitted for many applications when
properly sized and installed, but copper is especially common in
branch circuits.
Question 6
A 20-ampere branch circuit is being installed with copper conductors.
Which conductor size is commonly associated with a standard 20-
ampere branch circuit, subject to applicable requirements and
conditions?
A. 14 AWG
B. 12 AWG
C. 10 AWG only
D. 16 AWG
(Dual Residential & Commercial) Questions and
Correct Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
Question 1
What is the primary purpose of an overcurrent protective device such
as a circuit breaker?
A. To increase circuit voltage
B. To improve power factor
C. To protect conductors and equipment from excessive current
D. To provide a path for normal current to ground
Rationale: An overcurrent protective device opens a circuit when
current exceeds the permitted level. This helps prevent conductor
overheating, insulation damage, equipment damage, and fire
hazards. Circuit breakers and fuses are designed primarily for
overcurrent protection, not for increasing voltage or improving power
factor.
,Question 2
A 120-volt load draws 10 amperes. What is the approximate power
consumed by the load?
A. 12 watts
B. 100 watts
C. 1,200 watts
D. 12,000 watts
Rationale: Electrical power in a single-phase circuit can be calculated
using P = V × I. Therefore, 120 volts × 10 amperes = 1,200 watts. This
relationship is fundamental when sizing circuits and estimating
electrical loads.
Question 3
Which conductor normally carries current back from a 120-volt load to
the source?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded conductor
D. Bonding jumper
,Rationale: In a typical 120-volt circuit, the grounded conductor,
commonly called the neutral, provides the return path for current
from the load to the source. The equipment grounding conductor
normally does not carry current during normal operation.
Question 4
What is the primary function of an equipment grounding conductor?
A. Carry normal circuit current
B. Increase circuit voltage
C. Provide a low-impedance path for fault current
D. Reduce the resistance of the load
Rationale: The equipment grounding conductor provides a conductive
path intended to carry fault current back toward the source so that
the overcurrent protective device can operate promptly. It is not
intended to carry normal load current.
Question 5
Which material is commonly used for residential branch-circuit
conductors?
, A. Lead
B. Zinc
C. Copper
D. Cast iron
Rationale: Copper is widely used for electrical conductors because it
has excellent conductivity, mechanical strength, and corrosion
resistance. Aluminum is also permitted for many applications when
properly sized and installed, but copper is especially common in
branch circuits.
Question 6
A 20-ampere branch circuit is being installed with copper conductors.
Which conductor size is commonly associated with a standard 20-
ampere branch circuit, subject to applicable requirements and
conditions?
A. 14 AWG
B. 12 AWG
C. 10 AWG only
D. 16 AWG
