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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  20 %.
  2.5 %.
 10 %.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  aluminium.
  stainless steel.
  silicon steel.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  star connection.
  zig - zag connection.
  V connection.
  delta connection.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 1200 A.
 600 A.
 2400 A.
  3600 A.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 copper loss
 hysteresis loss
 both 1and 2

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
  230.2 V.
 399 V.
 50 V.

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MORE MCQ ON Electrical Machines

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