DC Motors
The mechanical power developed in a dc motor is maximum when back emf is equal to _____ the applied voltage.

None of the listed here
Twice
One-third
Half

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DC Motors
In variable speed motor

A weaker commutating field is needed at low speed than at high speed
Same 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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