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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
 0.9103 KW.
 1.644 KW.
  2.73 KW.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 2000 rpm
 1000 rpm
 250 rpm

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Electrical Machines
The armature of DC motor is laminated

 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.
 to reduce the eddy current loss.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 6 Ω
 5.7 Ω
 2.2 Ω

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Electrical Machines
Synchronous condensers are used to

All of these
 improve the power factor
 improve starting torque
 reduce hunting

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MORE MCQ ON Electrical Machines

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