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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 zero
 1500 rpm
 1470 rpm

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  larger output.
  none.
  both.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of cork gaskets used in transformer.
 condition of oil in transformer.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 turn- ratios are exactly equal
 polarities are properly connected
 percentage impedances are equal
 KVA ratings are equal

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  sinusoidal.
  flat topped.
  pulsating.

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt = Ea + Iara+ ILrs
 Vt= Ea– Iara
 Vt= Ea + Iara

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