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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 100 ohm.
  0.5 ohm.
  0.1 ohm.
 50 ohm.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Depends on other factor.
 Remain unchanged.
 Reduce by 5%.
  Increase by 5%.

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Electrical Machines
Capacitor in split phase induction motor is used to

 start the motor.
 improve the starting torque.
 improve the power factor.
 reduce the harmonics.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  low starting torque.
  less costly motor is not required.
 power factor is less.
  high starting torque.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Differntical compound.
 Series.
 Cummulative compound.

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
 both 1 and 2
None of these

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