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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  mild steel.
  stainless steel.
  cast iron.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 24.11 kW.
 25 kW.
 26.21 kW.
 23.06 kW.

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  results in reduced axial length of the machine.
All of these
  make it stiffer.

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Electrical Machines
In an ideal DC generator the regulation is

 positive.
 low.
 zero.
 high.

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Electrical Machines
Transformer oil is used as

 a coolant.
 inert medium.
 both A and B.
 an insulator.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  25 Hz.
  50 Hz.
  60 Hz.

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