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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 0KVA
 20KVA
 4KVA

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Electrical Machines
The induction motor shaft is made of

  mild steel.
  cast iron.
  stainless steel.
  aluminium.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 175 V
 120 V
 240 V
 140 V

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 0°.
  about 75°.
 about 115°.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 decrease
 not changed
 increase

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 1/Ia
 Ia2
 Ia

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