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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  Z.
  none of these.
  P.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 Friction and windage losses
 All of the them
 Eddy current losses

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  provide return path for the flux.
  hold armature stamping in position.
  protect the whole machine.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 500 rpm
 250 rpm
 1000 rpm

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as wide as possible.
  as small as possible.
  depends on the material of stator and the rotor.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 80.
 50.
  18.
 36.

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