DC Motors
If a dc motor is to be selected for conveyors, which motor would be preferred?

Series motor
Cummulative compound motor
Shunt motor
Differentially compound motor

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DC Motors
In variable speed motor

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

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