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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 full load
 half load
 any of the above
 no load

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Electrical Machines
The slot edges in a DC machine are made of

 Silicon steel.
 Mild steel.
 Cast iron.
  Fibre.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  repulsion start induction motor.
  synchronous motor.
  capacitor start induction motor.

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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

 400W
 500 W
 300 W
 250 W

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 3.2% and -1.6%
 4.8% and -3.2%
 6% and -4%

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 230 V
 65 V
 115 V

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