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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 less than
 any of the above
 greater than

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the starting torque.
 improve the power factor.
 reduce the harmonics.
 start the motor.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
  223.V.
 200 V.
 150 V.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

None of these
 decrease.
 either of these.
 increase.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 500 W
 250 W
 300 W
 400W

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on overload.
  there is no load on the generator.
  the generator runs on full load.
  the generator runs on designed speed.

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