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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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

  the machine with more drooping characteristic will supply less load.
None of these
 the machine with more drooping characteristic will supply more load.
  the machine will share load equally.

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Electrical Machines
For an ideal transformer the winding should have

 maximum resistance on primary side and least resistance on secondary side
 no ohmic resistance on either side
 equal resistance on primary and secondary side
 minimum resistance on primary side and maximum resistance on secondary side

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field resistance was higher than critical resistance
 field winding was wrongly connected
 field system lost residual magnetism
 there was a break in the armature circuit

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