DC Motors
For starting a dc motor a starter is required because

It limits the speed of the motor
It limits the starting current to a safe value
None of the listed here
It starts the motor

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DC Motors
In variable speed motor

Same commutating field is needed at low speed than at high speed
None of these
A weaker commutating field is needed at low speed than at high speed
A stronger commutating field is needed at low speed than at high speed

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