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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  pole faces.
None of these
  rotor shaft.
  stator frame.

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Electrical Machines
The frame of an induction motor is made of

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

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 110 VA
 550 VA
 100 VA

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 shunt motor.
 cummulative compound motor.
 AC synchronous motor.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 5 / 6.
 2 / 3.
  4 / 5.
 6 / 7.

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MORE MCQ ON Electrical Machines

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