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Electrical Machines

Electrical Machines
Example of double excited machine is

None of these
 Synchronous motor.
 DC Shunt Motor
 Both are correct.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Running torque.
 Rotor current.
 Line voltage.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant torque drive below the base speed.
 constant hp drive below the base speed.
 constant torque drive above the base speed.
 constant power drive above base speed.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 remain unaltered
 increase by 200%
 increase by 100%
 reduced to half

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 short circuit current and field current
 short circuit current and armature current
 no load voltage and field current

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 zero.
 two.
 infinity.
  unity.

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MORE MCQ ON Electrical Machines

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