DC Motors
In which of the following tests only one motor is required?

Brake test
Hopkinson's test
Field's test
Swinburne's test

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DC Motors
In variable speed motor

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

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