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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

None of these
  DOL.
  star delta.
  both A and B.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat less than 230 V
 somewhat more than 230 V
 6 V
 230 V

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 normal speed.
 any of the above.
 synchronous speed.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Armature voltage.
  Supply voltage.
  Field excitaion.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Reluctance motor.
  Slip ring induction motor.
  Universal motor.

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

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

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