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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
  50 - 150 W.
 10 - 20 W.
 250 - 500 W.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 open type winding
 wave winding
 closed winding
 lap winding

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Both B and C.
  Electromagnets.
 None of the options.
 Permanent magnets.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  It will rotates in normal operation.
  Either short circuit or open circuit occurs.
  Fail to start.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and indirect axis
 direct axis and interpolar axis
 quadrature axis and direct axis

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = s2X2.
  sR2 = X2.
  R2 = sX2.
  R2 = s2X2.

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MORE MCQ ON Electrical Machines

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