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Questions and Answers
What is the purpose of armature voltage control during the starting of a DC motor?
What is the purpose of armature voltage control during the starting of a DC motor?
- To reduce the back emf during starting
- To limit the motor current to a safe value by applying voltage gradually (correct)
- To increase the motor speed during starting
- To prevent sparking at the commutator during starting
What happens if a DC motor is started with full supply voltage across its terminals?
What happens if a DC motor is started with full supply voltage across its terminals?
- The motor will not start at all
- A very high current will flow, which may damage the motor (correct)
- The motor will start smoothly without any issues
- The motor will experience a decrease in speed
Which method is used to limit the armature current to a safe value during starting by adding a variable resistance in series with the armature circuit?
Which method is used to limit the armature current to a safe value during starting by adding a variable resistance in series with the armature circuit?
- Variable resistance control (correct)
- Field control
- Armature reaction control
- Back emf control
How does adding resistance in series with the armature circuit affect the loading speed of a DC motor?
How does adding resistance in series with the armature circuit affect the loading speed of a DC motor?
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What is the consequence of heavy sparking at the commutator during starting of a DC motor?
What is the consequence of heavy sparking at the commutator during starting of a DC motor?
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