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Electrical Machines

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

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

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Electrical Machines
_____________ types of induction motor are widely used.

  Squirrel cage IM.
  Three phase IM.
  Slip ring IM.
  Single phase IM.

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

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

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
  condition of paper insulation in transformer.
 condition of cork gaskets used in transformer.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Reluctance motor.
 DC shunt motor.
 Synchronous motor.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Series.
  Shunt.
  Compound.

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