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Electrical Machines

Electrical Machines
Stepper motor is used in

All of these
 food processing
 traction
 computer printers

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 None of above.
 Back emf is equal.
  Back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
 Blowers.
 Air compressors.
  Conveyers.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under leading pole tip.
 under the interpole.
 pole core.
 under trailing pole tip.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 4.
 1.
 2.

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Electrical Machines
Which of the following are variable losses?

 hysteresis loss
 armature copper loss
 eddy current loss
 shunt field copper loss

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