Alberta Electrician Apprenticeship
Certification Exam (Third Period)
Practice (Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a synchronous condenser in a power
system?
a) Voltage reduction
b) Power factor correction
c) Frequency control
d) Load shedding
Rationale: Synchronous condensers provide reactive power to improve
system power factor.
2. Which of the following motors has the highest starting torque?
a) Shaded pole motor
b) Split-phase motor
c) Capacitor-start motor
d) Universal motor
Rationale: Capacitor-start motors generate a strong phase shift that
increases starting torque.
3. In a three-phase system, what is the line voltage of a 120/208 V
system?
,a) 120 V
b) 208 V
c) 347 V
d) 600 V
Rationale: In a 120/208 V wye system, 208 V is the line-to-line voltage.
4. What is the synchronous speed of a 4-pole motor at 60 Hz?
a) 900 rpm
b) 1200 rpm
c) 1800 rpm
d) 3600 rpm
Rationale: Ns = 120 × f / poles = 120×60/4 = 1800 rpm.
5. A transformer’s primary has 600 turns and the secondary has 100
turns. If the primary voltage is 240 V, the secondary voltage is:
a) 24 V
b) 40 V
c) 60 V
d) 100 V
Rationale: Vs = Vp × Ns / Np = 240×100/600 = 40 V.
6. A 15 kVA, 600 V/120 V transformer draws what current on the 600 V
side?
a) 12.5 A
b) 18 A
c) 25 A
d) 50 A
Rationale: I = kVA ×1000 / V = 15000/600 = 25 A.
, 7. What does a motor starter primarily protect against?
a) Mechanical vibration
b) High speed
c) Overload conditions
d) High voltage
Rationale: Starters include overload relays that protect motors from
excessive current during running.
8. Surge arresters protect equipment from:
a) Overload
b) Phase loss
c) Transient overvoltages
d) Undervoltage
Rationale: Surge arresters absorb lightning and switching surge voltages.
9. Which relay protects a motor from single phasing?
a) Time-delay relay
b) Differential relay
c) Phase failure relay
d) Reverse power relay
Rationale: Phase-failure relays sense loss of one phase and trip.
10. What type of meter is used to measure power factor?
a) Voltmeter
b) Ammeter
c) Wattmeter
d) Power factor meter
Rationale: A power factor meter directly reads the phase angle relationship
between voltage and current.
Certification Exam (Third Period)
Practice (Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a synchronous condenser in a power
system?
a) Voltage reduction
b) Power factor correction
c) Frequency control
d) Load shedding
Rationale: Synchronous condensers provide reactive power to improve
system power factor.
2. Which of the following motors has the highest starting torque?
a) Shaded pole motor
b) Split-phase motor
c) Capacitor-start motor
d) Universal motor
Rationale: Capacitor-start motors generate a strong phase shift that
increases starting torque.
3. In a three-phase system, what is the line voltage of a 120/208 V
system?
,a) 120 V
b) 208 V
c) 347 V
d) 600 V
Rationale: In a 120/208 V wye system, 208 V is the line-to-line voltage.
4. What is the synchronous speed of a 4-pole motor at 60 Hz?
a) 900 rpm
b) 1200 rpm
c) 1800 rpm
d) 3600 rpm
Rationale: Ns = 120 × f / poles = 120×60/4 = 1800 rpm.
5. A transformer’s primary has 600 turns and the secondary has 100
turns. If the primary voltage is 240 V, the secondary voltage is:
a) 24 V
b) 40 V
c) 60 V
d) 100 V
Rationale: Vs = Vp × Ns / Np = 240×100/600 = 40 V.
6. A 15 kVA, 600 V/120 V transformer draws what current on the 600 V
side?
a) 12.5 A
b) 18 A
c) 25 A
d) 50 A
Rationale: I = kVA ×1000 / V = 15000/600 = 25 A.
, 7. What does a motor starter primarily protect against?
a) Mechanical vibration
b) High speed
c) Overload conditions
d) High voltage
Rationale: Starters include overload relays that protect motors from
excessive current during running.
8. Surge arresters protect equipment from:
a) Overload
b) Phase loss
c) Transient overvoltages
d) Undervoltage
Rationale: Surge arresters absorb lightning and switching surge voltages.
9. Which relay protects a motor from single phasing?
a) Time-delay relay
b) Differential relay
c) Phase failure relay
d) Reverse power relay
Rationale: Phase-failure relays sense loss of one phase and trip.
10. What type of meter is used to measure power factor?
a) Voltmeter
b) Ammeter
c) Wattmeter
d) Power factor meter
Rationale: A power factor meter directly reads the phase angle relationship
between voltage and current.
