Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 torque but not the voltage
 neither the voltage nor the torque
 both the torque and voltage

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 the former during starting and the latter at a fraction of its rated speed.
 cage induction machines and they are essentially the same.
 any of the above.

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