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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
 food processing
 traction
All of these

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
  same.
 proportionate to MVA rating of transformers.

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Limit the flux.
 Avoid sparking.
 Limit the current.
  Limit the speed.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

All of these
  frequency of waveform.
  number of turns in coil.
  flux per pole.

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Electrical Machines
The crawling in the induction motor is caused by

 low voltage supply
 harmonics developed in the motor
 high loads
 improper design of stator laminations

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of supply voltage.
  Change of supply frequency.
  Change of number of pole.

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