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How much torque is ensured by resistance adding arrangement in 3-point starter?

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How much torque is ensured by resistance adding arrangement in 3-point starter?

(a) Low and non-zero

(b) Infinite

(c) High finite

(d) Zero

This question was posed to me during an interview.

My question is from Starting of DC Motors topic in section DC Motors of DC Machines

1 Answer

+2 votes
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Best answer
Correct choice is (c) High finite

The best explanation: As a starting handle is rotated one resistance step is added into field circuit. There is a short time wait at each stud for the motor to build up speed. This arrangement ensures a high average starting torque.

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