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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  open circuit.
  decrease in speed.
  short circuit.
  increase in speed.

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 57.7%
 33.3%
 66.3%
 50%

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
All of these
 2 point starter
 4 point starter

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
 infinity.
 zero.
  unity.

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Electrical Machines
Under commutation results in

  sparking at the middle of the brush.
  no sparking.
  sparking at the leading edge of the brush.
  sparking the trailing edge of the brush.

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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