ALBERTA ELECTRICIAN APPRENTICESHIP
Certification Practice Exam Questions and
Answers with Rationales Latest Version
Top Rated
Question 1
A 120 V branch circuit supplies a load drawing 18 A continuously for
more than one hour. According to the Canadian Electrical Code, what is
the minimum branch-circuit rating required?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
✅ Correct Answer: C. 25 A
Rationale
A continuous load is one expected to operate for 3 hours or more.
Under the Canadian Electrical Code (CEC), branch circuits supplying
continuous loads are generally sized at 125% of the continuous load.
Calculation:
18 A × 1.25 = 22.5 A
Since there is no standard 22.5 A breaker, the next standard size is 25 A.
Why the others are incorrect
, • A: Too small.
• B: Below the required ampacity.
• D: Larger than necessary.
Question 2
What instrument is most appropriate for measuring insulation resistance
of a motor winding?
A. Clamp-on ammeter
B. Megohmmeter
C. Digital multimeter
D. Wattmeter
✅ Correct Answer: B. Megohmmeter
Rationale
A megohmmeter (Megger) applies a high DC voltage to determine
insulation quality.
It detects:
• Moisture
• Deteriorated insulation
• Leakage paths
• Ground faults
Other meters cannot properly evaluate insulation resistance.
Question 3
,Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current multiplied by resistance
C. Power divided by current
D. Resistance divided by current
✅ Correct Answer: B. Current multiplied by resistance
Rationale
Ohm's Law:
V=I×R
where:
• V = Voltage
• I = Current
• R = Resistance
Question 4
A conductor has resistance of 10 Ω. Current flowing through it is 8 A.
How much power is dissipated?
A. 80 W
B. 320 W
C. 640 W
D. 800 W
, ✅ Correct Answer: C. 640 W
Rationale
Power:
P = I²R
= 8² × 10
= 64 × 10
= 640 W
Question 5
Which colour identifies the equipment grounding conductor in Canadian
wiring?
A. Black
B. White
C. Green or bare
D. Red
✅ Correct Answer: C. Green or bare
Rationale
CEC identifies grounding conductors as:
• Green
• Green with yellow stripe
• Bare copper
Certification Practice Exam Questions and
Answers with Rationales Latest Version
Top Rated
Question 1
A 120 V branch circuit supplies a load drawing 18 A continuously for
more than one hour. According to the Canadian Electrical Code, what is
the minimum branch-circuit rating required?
A. 15 A
B. 20 A
C. 25 A
D. 30 A
✅ Correct Answer: C. 25 A
Rationale
A continuous load is one expected to operate for 3 hours or more.
Under the Canadian Electrical Code (CEC), branch circuits supplying
continuous loads are generally sized at 125% of the continuous load.
Calculation:
18 A × 1.25 = 22.5 A
Since there is no standard 22.5 A breaker, the next standard size is 25 A.
Why the others are incorrect
, • A: Too small.
• B: Below the required ampacity.
• D: Larger than necessary.
Question 2
What instrument is most appropriate for measuring insulation resistance
of a motor winding?
A. Clamp-on ammeter
B. Megohmmeter
C. Digital multimeter
D. Wattmeter
✅ Correct Answer: B. Megohmmeter
Rationale
A megohmmeter (Megger) applies a high DC voltage to determine
insulation quality.
It detects:
• Moisture
• Deteriorated insulation
• Leakage paths
• Ground faults
Other meters cannot properly evaluate insulation resistance.
Question 3
,Ohm's Law states that voltage equals:
A. Current divided by resistance
B. Current multiplied by resistance
C. Power divided by current
D. Resistance divided by current
✅ Correct Answer: B. Current multiplied by resistance
Rationale
Ohm's Law:
V=I×R
where:
• V = Voltage
• I = Current
• R = Resistance
Question 4
A conductor has resistance of 10 Ω. Current flowing through it is 8 A.
How much power is dissipated?
A. 80 W
B. 320 W
C. 640 W
D. 800 W
, ✅ Correct Answer: C. 640 W
Rationale
Power:
P = I²R
= 8² × 10
= 64 × 10
= 640 W
Question 5
Which colour identifies the equipment grounding conductor in Canadian
wiring?
A. Black
B. White
C. Green or bare
D. Red
✅ Correct Answer: C. Green or bare
Rationale
CEC identifies grounding conductors as:
• Green
• Green with yellow stripe
• Bare copper
