DC Motors
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?

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

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DC Motors
In variable speed motor

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

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