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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / E2

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 19%
 40%
 5%

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2KfBm2.
 KefKf2Bm2.
 Kef2Kf2Bm.
  Kef2Kf2Bm2.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  cage.
  linear.
  none of these.

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Electrical Machines
Which of the DC Motor use flywheel?

 Series motor.
 Shunt motor.
 Differently compared motor.
 Cumulatively compound motor.

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