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Electrical Machines

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

  variable.
  constant.
  maximum.
  minimum.

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Electrical Machines
The output indicate on the name plate of any motor is always the

  Output power at the shaft.
 Power drawn in KVA.
 Power drawn in KW.
 Gross power.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Induction motor.
 Synchronous motor.
 AC single phase motor.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Repulsion.
  Split phase.
  Capacitor run.

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
  2 - s.
 2 + s.
 1 - s.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

  increase the speed of shaft rotation.
 increase the number of turns in field coil.
 increase the number of turns in armature coil.
 increase the source frequency.

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