Alberta Electrician Apprenticeship
Certification Exam (Second Period)
Practice (Questions and Correct Answers
(Verified Answers) Plus Rationales
Q1. What is the minimum size of grounding electrode conductor
required for a 200A service using copper?
A. No. 8 AWG
B. No. 6 AWG
C. No. 4 AWG
D. No. 2 AWG
Rationale: Copper grounding electrode conductors for 200A services
require at least No. 6 AWG according to standard service grounding tables.
Q2. Which device is used to limit inrush current in motor starting?
A. Contactor
B. Relay
C. Soft starter
D. Transformer
Rationale: Soft starters reduce inrush current by controlling voltage
applied during startup.
Q3. What is the synchronous speed of a 4-pole induction motor on a 60
Hz supply?
,A. 1200 RPM
B. 1500 RPM
C. 1800 RPM
D. 3600 RPM
Rationale: Synchronous speed = 120 × frequency ÷ poles = 120×60 ÷ 4 =
1800 RPM.
Q4. A 3-phase system has line voltage 600V. What is its phase voltage?
A. 277V
B. 208V
C. 240V
D. 346V
Rationale: Phase voltage = line voltage ÷ √3 = 600 ÷ 1.732 ≈ 346V.
Q5. What is the purpose of an overload relay?
A. Short-circuit protection
B. Ground fault protection
C. Motor overcurrent protection
D. Phase correction
Rationale: Overload relays protect motors from excessive current over time,
not short circuits.
Q6. What is the maximum disconnect height above the floor?
A. 1.8 m
B. 1.5 m
C. 2.0 m
D. 2.2 m
Rationale: Maximum permissible height for disconnect operation is 2.0 m.
, Q7. What is the trip characteristic of a Class 10 overload?
A. Trips in 2 sec
B. Trips in 20 sec
C. Trips within 10 sec
D. Delayed indefinite
Rationale: Class 10 overloads must trip within 10 seconds at locked-rotor
current.
Q8. Which connection gives the highest starting torque for a 3-phase
motor?
A. Part winding
B. Soft start
C. Wye start
D. Delta start
Rationale: Delta provides full-line voltage, producing highest starting
torque.
Q9. What does a VFD primarily control?
A. Torque
B. Current
C. Voltage
D. Frequency
Rationale: VFDs vary motor speed by changing frequency.
Q10. Which meter measures insulation resistance?
A. Multimeter
B. Ohmmeter
C. Megger
D. Clamp meter
Certification Exam (Second Period)
Practice (Questions and Correct Answers
(Verified Answers) Plus Rationales
Q1. What is the minimum size of grounding electrode conductor
required for a 200A service using copper?
A. No. 8 AWG
B. No. 6 AWG
C. No. 4 AWG
D. No. 2 AWG
Rationale: Copper grounding electrode conductors for 200A services
require at least No. 6 AWG according to standard service grounding tables.
Q2. Which device is used to limit inrush current in motor starting?
A. Contactor
B. Relay
C. Soft starter
D. Transformer
Rationale: Soft starters reduce inrush current by controlling voltage
applied during startup.
Q3. What is the synchronous speed of a 4-pole induction motor on a 60
Hz supply?
,A. 1200 RPM
B. 1500 RPM
C. 1800 RPM
D. 3600 RPM
Rationale: Synchronous speed = 120 × frequency ÷ poles = 120×60 ÷ 4 =
1800 RPM.
Q4. A 3-phase system has line voltage 600V. What is its phase voltage?
A. 277V
B. 208V
C. 240V
D. 346V
Rationale: Phase voltage = line voltage ÷ √3 = 600 ÷ 1.732 ≈ 346V.
Q5. What is the purpose of an overload relay?
A. Short-circuit protection
B. Ground fault protection
C. Motor overcurrent protection
D. Phase correction
Rationale: Overload relays protect motors from excessive current over time,
not short circuits.
Q6. What is the maximum disconnect height above the floor?
A. 1.8 m
B. 1.5 m
C. 2.0 m
D. 2.2 m
Rationale: Maximum permissible height for disconnect operation is 2.0 m.
, Q7. What is the trip characteristic of a Class 10 overload?
A. Trips in 2 sec
B. Trips in 20 sec
C. Trips within 10 sec
D. Delayed indefinite
Rationale: Class 10 overloads must trip within 10 seconds at locked-rotor
current.
Q8. Which connection gives the highest starting torque for a 3-phase
motor?
A. Part winding
B. Soft start
C. Wye start
D. Delta start
Rationale: Delta provides full-line voltage, producing highest starting
torque.
Q9. What does a VFD primarily control?
A. Torque
B. Current
C. Voltage
D. Frequency
Rationale: VFDs vary motor speed by changing frequency.
Q10. Which meter measures insulation resistance?
A. Multimeter
B. Ohmmeter
C. Megger
D. Clamp meter
