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Electrical Machines

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?

 1820W
 2000W
 1450W
 1920W

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  cogging.
  air gap.
  relative speed.
  crawling.

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

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

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

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

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 180.
 160.
  150.
 170.

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Electrical Machines
If the excitation is reduced, the power factor is

 leading power factor
None of these
 unity power factor
 lagging power factor

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