DC Motors
Which of the following can be used for controlling the speed of a dc motor?

Thyristor
Thyratron
Thermistor
Transistor

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DC Motors
In variable speed motor

None of these
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

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