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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 copper loss
 both 1and 2
 eddy current loss

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always opened.
  always closed.
  none.
  semi closed or semi opened.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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Electrical Machines
The shaft of induction motor should be

  any of these.
  flexible.
  stiff.
  hollow.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 94%
 95%
 92%

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum voltage.
 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum power.

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