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Electrical Machines

Electrical Machines
Stepper motor is used in

All of these
 computer printers
 food processing
 traction

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  harmonics.
  cogging.
  crawling.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  220 V.
  zero.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 increase
None of these
 decrease
 either increase or decrease

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
 Xd < Xq.
 Xd > Xq.
None of these

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 hysteresis loss
 temperature rise
 eddy-current loss
 mechanical loss

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MORE MCQ ON Electrical Machines

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