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Starting of DC Motors

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Questions and Answers

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?

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?

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?

<p>$R_s$ does not affect the no-load speed, but it affects the loading speed (speed drop)</p> Signup and view all the answers

What is the consequence of heavy sparking at the commutator during starting of a DC motor?

<p>Damage to the commutator and winding</p> Signup and view all the answers

Starting of DC Motors

Choose a study mode

Podcast

Questions and Answers

What is the purpose of armature voltage control during the starting of a DC motor?

What happens if a DC motor is started with full supply voltage across its terminals?

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?

How does adding resistance in series with the armature circuit affect the loading speed of a DC motor?

What is the consequence of heavy sparking at the commutator during starting of a DC motor?

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