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Electrical Machines

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

 1000 rpm
 750 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  synchronous motor.
  repulsion motor type starting.
  capacitor run IM.
  transformer with short-circuited secondary.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 0 < S < 1
 0 < S < 2
 -2 < S < 2

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
 size of air gap.
  all of above.
  shape of the pole shoe.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 hysteresis loss
 eddy-current loss
 mechanical loss

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 230 V
 460 V
 115 V

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