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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  short circuit.
  increase in speed.
  decrease in speed.
  open circuit.

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Electrical Machines
The DC compound motors are generally

 Level Compound.
 Cummulative compound.
 None of these.
 Differentical compound.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Increase.
 Remain unaltered.
 Reduce.
 Oscillate around the normal speed.

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
None of these
 cylindrical motor
 salient pole motor

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 100 Hz
 25 Hz
 0 Hz

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
  8.
 2.
 4.

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