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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 1.92
 -1.92
 -0.08
 0.08

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 1500 rpm
 1000 rpm
 3000 rpm

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 200Ω
 50Ω
 100Ω

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

All of these
 lagging power factor
 leading power factor
 unity power factor

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the hysteresis loss.

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  lesser than power transformer.
  higher than power transformer.
  equal as power transformer.

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