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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 hysteresis loss
 copper loss
 eddy current loss

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Both of above.
 Heavy sparking at the first stud of starting resistance steps.
 None of these.
 Heavy sparking at brushes.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 decreased.
  remains unchanged.
 increased.
 kept constant to certain value.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2, 3 and 4.
 2 and 4.
 1, 3 and 4.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 100 Hz.
 50 Hz.
 Zero Hz.

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the armature current will reduce.
 the motor will come to stop.
 the speed of motor will be reduced.
 the motor will attain dangerously high speed.

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