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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  50 Hz.
  25 Hz.
  16.67 Hz.

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

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

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase in proportion to reduction in load.
 DC Shunt Motor
 The speed will increase abruptly.
  The speed will remains almost constant.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  star connection.
  delta connection.
  zig - zag connection.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  cogging.
  relative speed.
  crawling.
  air gap.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 20 volts.
 30 volts.
 10 volts.

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