Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Lagging power factor.
 Zero power factor.
 Unity power factor.

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 wave-wound machine will have more rated current and more voltage
 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and less current

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Electrical Machines
Cogging and crawling are phenomena associated with

 cage induction machines and they are essentially the same.
 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.
 any of the above.

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