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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

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

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  carbon.
  phosphor bronze.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

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

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Electrical Machines
The shaft of induction motor should be

  flexible.
  any of these.
  stiff.
  hollow.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve voltage level.
  Improve current level.
  Improve power level.
  Improve power factor.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

 1.
  slip X 69 / 3.
  slip X 50 / 3.
  slip X 59 / 3.

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