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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 0.1 Ω
 50 Ω
 100 Ω

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Decreases.
 Increases.
 None of above.
 Remain unchanged

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Electrical Machines
Armature reaction in dc motor results

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

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

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

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 high current and high voltage
 low current and high voltage
 low current and low voltage

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
 Full load speed.
 Full load torque.
  Full load current.

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