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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  aluminium.
  stainless steel.
  cast iron.
  mild steel.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1000W , 1400W
 1600W, 800W
 1400W, 1000W

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ f/φ
 E ∝ φ/f
 E ∝ φf
 E ∝ 1/(φf)

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Both B and C.
  Electromagnets.
 Permanent magnets.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/3
 2/√5
 1/√2
 1/√5

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Electrical Machines
Stepper motor is used in

 computer printers
All of these
 traction
 food processing

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