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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 -2 < S < 2
 0 < S < 1
 0 < S < 2

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Electrical Machines
In a DC Shunt Motor if the load current increases keeping the terminal voltage constant, then flux will

 increase.
 any of the above.
 remain constant.
 decrease.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  approx to one.
  very low
  greater than one.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 50, s = 4.43 %.
  P = 60, s = 0.96 %.
  P = 20, s = 3.33 %.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 eddy current loss.
 friction and windage loss.
 copper loss.
 hysteresis loss.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  4000 rpm.
  3600 rpm.
  1500 rpm.

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