Electrical Level 3 Module 6 Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is a common reason for motor failure?
✔✔ Motor failure can often be caused by overheating, which may result from poor ventilation,
overloading, or faulty wiring.
Why do you need to properly size a wire for a specific circuit?
✔✔ Properly sizing the wire ensures it can safely handle the current without overheating or
causing a fire hazard.
What is the function of a contactor in a motor control circuit?
✔✔ A contactor is used to control the flow of electrical current to a motor by opening and
closing the circuit.
What is the significance of properly grounding a generator?
✔✔ Grounding a generator ensures safety by providing a path for fault currents, helping prevent
electric shock and fire hazards.
1
, What type of wire should be used for underground installations?
✔✔ For underground installations, you should use wire types rated for direct burial, such as UF
(underground feeder) or THWN.
What is the purpose of a motor overload relay?
✔✔ A motor overload relay protects the motor from damage due to prolonged overcurrent
conditions by disconnecting the power if it exceeds safe limits.
How do you select the correct size of a fuse for a circuit?
✔✔ The fuse size is selected based on the current rating of the circuit and the wire size to ensure
protection against overcurrent without unnecessary interruptions.
What is the difference between a star connection and a delta connection in three-phase systems?
✔✔ A star connection has one common point where all three phases meet, while a delta
connection forms a closed loop without a neutral point.
Why is it important to install proper ventilation around electrical panels?
✔✔ Proper ventilation prevents overheating of electrical components, ensuring efficient
operation and preventing fire hazards.
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and Answers | Latest Version | 2024/2025
| Correct & Verified
What is a common reason for motor failure?
✔✔ Motor failure can often be caused by overheating, which may result from poor ventilation,
overloading, or faulty wiring.
Why do you need to properly size a wire for a specific circuit?
✔✔ Properly sizing the wire ensures it can safely handle the current without overheating or
causing a fire hazard.
What is the function of a contactor in a motor control circuit?
✔✔ A contactor is used to control the flow of electrical current to a motor by opening and
closing the circuit.
What is the significance of properly grounding a generator?
✔✔ Grounding a generator ensures safety by providing a path for fault currents, helping prevent
electric shock and fire hazards.
1
, What type of wire should be used for underground installations?
✔✔ For underground installations, you should use wire types rated for direct burial, such as UF
(underground feeder) or THWN.
What is the purpose of a motor overload relay?
✔✔ A motor overload relay protects the motor from damage due to prolonged overcurrent
conditions by disconnecting the power if it exceeds safe limits.
How do you select the correct size of a fuse for a circuit?
✔✔ The fuse size is selected based on the current rating of the circuit and the wire size to ensure
protection against overcurrent without unnecessary interruptions.
What is the difference between a star connection and a delta connection in three-phase systems?
✔✔ A star connection has one common point where all three phases meet, while a delta
connection forms a closed loop without a neutral point.
Why is it important to install proper ventilation around electrical panels?
✔✔ Proper ventilation prevents overheating of electrical components, ensuring efficient
operation and preventing fire hazards.
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