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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
All of these
 magnetization
 demagnetization

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia.
  Ia2.
  √Ia.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 constant speed.
 not suitable for rapidly changing loads.
 less expensive.
 none of above.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at rated load only
 both A and B
 low at heavy loads only
 low at light loads only

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
None of these
 decreases.
 remains same.

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Electrical Machines
Armature reaction in dc motor results

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

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