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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1-S
 1/(1-S)
 1/S

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 copper loss.
 eddy electric current loss.
 vibrations.
 hysteresis loss.

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

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

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 230 volt.
 240 volt.
  220 volt.
 440 volt.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
 Cylindrical rotor.
None of these
 Both type rotor.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

  DC of slip frequency.
 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
 DC.

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