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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 six.
 three.
 two.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  efficiency.
  ratio of starting to running torque.
  ratio of starting to running current.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Hysteresis loss.
 Eddy current loss.
 Copper loss.

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
All of these
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1600W, 800W
 1000W , 1400W
 1400W, 1000W
 800W, 1600W

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 rating.
 leakage reactance.
 efficiency.
 percentage impedance.

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MORE MCQ ON Electrical Machines

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