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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Ns
 Nr
 S.Ns

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Can not be determined.
 Mechanical power.
 Induced emf.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  constant.
  variable.
  minimum.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
  Increases.
 None of above.
 Remains unchanged.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 more than 30 W
 less than 30 W
 30 W

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
  60, 1500.
 50, 1500.
 60, 1440.

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