Manitoba Industrial Electrician Certification
Practice Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a control transformer in an
industrial control circuit?
A. To increase line voltage
B. To provide a lower, isolated control voltage
C. To correct power factor
D. To balance three-phase loads
Control transformers step down and isolate voltage for control
devices such as relays and contactors.
2. Which device provides overload protection for an electric motor?
A. Fuse
B. Circuit breaker
C. Overload relay
D. Contactor
Overload relays protect motors from overheating due to excessive
current over time.
3. In a three-phase system, what is the phase angle between phases?
A. 60 degrees
B. 90 degrees
C. 120 degrees
D. 180 degrees
, Three-phase power systems are spaced 120 electrical degrees
apart.
4. What is the main function of a contactor?
A. Protect against short circuits
B. Measure current flow
C. Control power to a load
D. Step down voltage
Contactors are electrically operated switches used to control
motors and other loads.
5. Which type of motor is most commonly used in industrial
applications?
A. Universal motor
B. Shaded pole motor
C. Three-phase induction motor
D. Synchronous clock motor
Three-phase induction motors are robust, efficient, and widely
used in industry.
6. What is the purpose of grounding metallic enclosures?
A. Improve efficiency
B. Provide a safe path for fault current
C. Reduce voltage drop
D. Increase system impedance
Grounding prevents enclosures from becoming energized and
protects personnel.
7. Which NEC/CEC color is typically used for grounding conductors?
A. Black
B. White
, C. Green or green/yellow
D. Red
Green or green/yellow insulation identifies grounding conductors.
8. What happens to current when resistance increases and voltage
remains constant?
A. It increases
B. It decreases
C. It remains the same
D. It becomes zero
Ohm’s Law shows current is inversely proportional to resistance.
9. Which instrument is used to measure insulation resistance?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Oscilloscope
A megohmmeter applies high voltage to test insulation integrity.
10. What is the purpose of an interlock in a control circuit?
A. Increase current flow
B. Prevent simultaneous operation of conflicting devices
C. Reduce voltage
D. Improve power factor
Interlocks enhance safety and correct operation.
11. Which motor starter reduces inrush current at startup?
A. Across-the-line starter
B. Manual starter
C. Star-delta starter
Practice Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of a control transformer in an
industrial control circuit?
A. To increase line voltage
B. To provide a lower, isolated control voltage
C. To correct power factor
D. To balance three-phase loads
Control transformers step down and isolate voltage for control
devices such as relays and contactors.
2. Which device provides overload protection for an electric motor?
A. Fuse
B. Circuit breaker
C. Overload relay
D. Contactor
Overload relays protect motors from overheating due to excessive
current over time.
3. In a three-phase system, what is the phase angle between phases?
A. 60 degrees
B. 90 degrees
C. 120 degrees
D. 180 degrees
, Three-phase power systems are spaced 120 electrical degrees
apart.
4. What is the main function of a contactor?
A. Protect against short circuits
B. Measure current flow
C. Control power to a load
D. Step down voltage
Contactors are electrically operated switches used to control
motors and other loads.
5. Which type of motor is most commonly used in industrial
applications?
A. Universal motor
B. Shaded pole motor
C. Three-phase induction motor
D. Synchronous clock motor
Three-phase induction motors are robust, efficient, and widely
used in industry.
6. What is the purpose of grounding metallic enclosures?
A. Improve efficiency
B. Provide a safe path for fault current
C. Reduce voltage drop
D. Increase system impedance
Grounding prevents enclosures from becoming energized and
protects personnel.
7. Which NEC/CEC color is typically used for grounding conductors?
A. Black
B. White
, C. Green or green/yellow
D. Red
Green or green/yellow insulation identifies grounding conductors.
8. What happens to current when resistance increases and voltage
remains constant?
A. It increases
B. It decreases
C. It remains the same
D. It becomes zero
Ohm’s Law shows current is inversely proportional to resistance.
9. Which instrument is used to measure insulation resistance?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Oscilloscope
A megohmmeter applies high voltage to test insulation integrity.
10. What is the purpose of an interlock in a control circuit?
A. Increase current flow
B. Prevent simultaneous operation of conflicting devices
C. Reduce voltage
D. Improve power factor
Interlocks enhance safety and correct operation.
11. Which motor starter reduces inrush current at startup?
A. Across-the-line starter
B. Manual starter
C. Star-delta starter
