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Electrical Machines

Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
 demagnetising.
  magnetising.
  none of above.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
None of these
 GNA
 either GNA or MNA

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Output power at the shaft.
 Power drawn in KW.
 Gross power.
 Power drawn in KVA.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
 Same in both induction motors.
None of these
 Squirrel cage induction motor.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and zero power factor tests.
 open circuit and short circuit tests.
 short circuit and slip tests.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  increase the starting torque.
  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.

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MORE MCQ ON Electrical Machines

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