ALBERTA ELECTRICIAN THIRD PERIOD AIT EXAM – QUESTIONS AND ANSWERS | VERIFIED AND
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE |
EXAM PREP | STUDY GUIDE | PRACTICE TEST
1. A journeyperson electrician is installing a branch circuit in a commercial building. Which
factor primarily determines the minimum conductor size required?
A. Voltage drop only
B. Load current and insulation rating
C. Color coding of conductors
D. Length of conduit run
════════════════════
Correct Answer: B. Load current and insulation rating
Rationale:
The minimum conductor size is determined by the expected load current and the insulation
temperature rating of the conductor. This ensures safe current-carrying capacity. Voltage drop
and conduit length may influence design, but they are secondary considerations.
════════════════════
2. When troubleshooting a three-phase motor that fails to start, which is the FIRST step in the
diagnostic process?
A. Replace the motor starter
B. Check incoming power supply
C. Replace overload relays
D. Inspect motor windings immediately
════════════════════
Correct Answer: B. Check incoming power supply
Rationale:
Verifying incoming power ensures the system has proper voltage before deeper diagnostics.
Replacing components without confirming supply conditions may lead to unnecessary repairs.
════════════════════
3. What is the primary purpose of a ground fault circuit interrupter (GFCI)?
,A. Increase circuit voltage stability
B. Protect against overload conditions
C. Prevent electric shock hazards
D. Balance three-phase loads
════════════════════
Correct Answer: C. Prevent electric shock hazards
Rationale:
A GFCI detects leakage current to ground and quickly disconnects the circuit to prevent shock
hazards, especially in wet or damp environments.
════════════════════
4. A conductor is rated for 75°C insulation. What is the main limitation when applying
ampacity values?
A. It must be derated for conduit type
B. It must not exceed 75°C termination rating
C. It can only be used in residential wiring
D. It requires aluminum conductors only
════════════════════
Correct Answer: B. It must not exceed 75°C termination rating
Rationale:
Even if the conductor insulation allows higher temperatures, termination points (like breakers
and lugs) limit allowable ampacity.
════════════════════
5. In a control circuit, what is the function of a normally open (NO) contact in a relay?
A. It completes the circuit when de-energized
B. It opens the circuit when energized
C. It completes the circuit when energized
D. It maintains constant resistance
════════════════════
Correct Answer: C. It completes the circuit when energized
, Rationale:
A normally open contact closes when the relay coil is energized, allowing current flow through
the circuit.
════════════════════
6. A technician measures zero voltage between phase and neutral. What is the MOST likely
cause?
A. Open neutral connection
B. Tripped upstream breaker
C. Shorted load circuit
D. Reversed polarity
════════════════════
Correct Answer: B. Tripped upstream breaker
Rationale:
If the breaker is tripped, no potential difference exists, resulting in zero voltage readings.
════════════════════
7. What is the purpose of a lockout/tagout (LOTO) procedure?
A. Improve system efficiency
B. Prevent accidental energization during maintenance
C. Increase system voltage
D. Reduce conductor resistance
════════════════════
Correct Answer: B. Prevent accidental energization during maintenance
Rationale:
LOTO ensures equipment cannot be energized while technicians are working, reducing risk of
injury.
════════════════════
, 8. Which device is used to protect against overcurrent conditions in residential circuits?
A. Transformer
B. Circuit breaker
C. Contactor
D. Relay coil
════════════════════
Correct Answer: B. Circuit breaker
Rationale:
Circuit breakers automatically disconnect power when current exceeds safe limits.
════════════════════
9. In electrical installations, what does “continuity” testing confirm?
A. Voltage presence
B. Current flow direction
C. Complete conductive path
D. Insulation resistance
════════════════════
Correct Answer: C. Complete conductive path
Rationale:
Continuity testing verifies that a circuit is complete and uninterrupted.
════════════════════
10. What is the main risk of undersized conductors in a circuit?
A. Excessive brightness
B. Voltage stabilization
C. Overheating and fire hazard
D. Reduced insulation resistance
════════════════════
Correct Answer: C. Overheating and fire hazard
Rationale:
WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE |
EXAM PREP | STUDY GUIDE | PRACTICE TEST
1. A journeyperson electrician is installing a branch circuit in a commercial building. Which
factor primarily determines the minimum conductor size required?
A. Voltage drop only
B. Load current and insulation rating
C. Color coding of conductors
D. Length of conduit run
════════════════════
Correct Answer: B. Load current and insulation rating
Rationale:
The minimum conductor size is determined by the expected load current and the insulation
temperature rating of the conductor. This ensures safe current-carrying capacity. Voltage drop
and conduit length may influence design, but they are secondary considerations.
════════════════════
2. When troubleshooting a three-phase motor that fails to start, which is the FIRST step in the
diagnostic process?
A. Replace the motor starter
B. Check incoming power supply
C. Replace overload relays
D. Inspect motor windings immediately
════════════════════
Correct Answer: B. Check incoming power supply
Rationale:
Verifying incoming power ensures the system has proper voltage before deeper diagnostics.
Replacing components without confirming supply conditions may lead to unnecessary repairs.
════════════════════
3. What is the primary purpose of a ground fault circuit interrupter (GFCI)?
,A. Increase circuit voltage stability
B. Protect against overload conditions
C. Prevent electric shock hazards
D. Balance three-phase loads
════════════════════
Correct Answer: C. Prevent electric shock hazards
Rationale:
A GFCI detects leakage current to ground and quickly disconnects the circuit to prevent shock
hazards, especially in wet or damp environments.
════════════════════
4. A conductor is rated for 75°C insulation. What is the main limitation when applying
ampacity values?
A. It must be derated for conduit type
B. It must not exceed 75°C termination rating
C. It can only be used in residential wiring
D. It requires aluminum conductors only
════════════════════
Correct Answer: B. It must not exceed 75°C termination rating
Rationale:
Even if the conductor insulation allows higher temperatures, termination points (like breakers
and lugs) limit allowable ampacity.
════════════════════
5. In a control circuit, what is the function of a normally open (NO) contact in a relay?
A. It completes the circuit when de-energized
B. It opens the circuit when energized
C. It completes the circuit when energized
D. It maintains constant resistance
════════════════════
Correct Answer: C. It completes the circuit when energized
, Rationale:
A normally open contact closes when the relay coil is energized, allowing current flow through
the circuit.
════════════════════
6. A technician measures zero voltage between phase and neutral. What is the MOST likely
cause?
A. Open neutral connection
B. Tripped upstream breaker
C. Shorted load circuit
D. Reversed polarity
════════════════════
Correct Answer: B. Tripped upstream breaker
Rationale:
If the breaker is tripped, no potential difference exists, resulting in zero voltage readings.
════════════════════
7. What is the purpose of a lockout/tagout (LOTO) procedure?
A. Improve system efficiency
B. Prevent accidental energization during maintenance
C. Increase system voltage
D. Reduce conductor resistance
════════════════════
Correct Answer: B. Prevent accidental energization during maintenance
Rationale:
LOTO ensures equipment cannot be energized while technicians are working, reducing risk of
injury.
════════════════════
, 8. Which device is used to protect against overcurrent conditions in residential circuits?
A. Transformer
B. Circuit breaker
C. Contactor
D. Relay coil
════════════════════
Correct Answer: B. Circuit breaker
Rationale:
Circuit breakers automatically disconnect power when current exceeds safe limits.
════════════════════
9. In electrical installations, what does “continuity” testing confirm?
A. Voltage presence
B. Current flow direction
C. Complete conductive path
D. Insulation resistance
════════════════════
Correct Answer: C. Complete conductive path
Rationale:
Continuity testing verifies that a circuit is complete and uninterrupted.
════════════════════
10. What is the main risk of undersized conductors in a circuit?
A. Excessive brightness
B. Voltage stabilization
C. Overheating and fire hazard
D. Reduced insulation resistance
════════════════════
Correct Answer: C. Overheating and fire hazard
Rationale:
