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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 0°.
 about 115°.
 90°.

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  insufficient starting torque.
  space harmonics produced by winding currents.
  time harmonics in supply.

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Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  pulsating.
  triangular.
  rectangular.

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Electrical Machines
Width of a carbon brush should be equal to

 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 S
 1-S
 1/S

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under trailing pole tip.
 under leading pole tip.
 pole core.
 under the interpole.

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