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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 30°.
 60°.
 90°.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 none of these.
 has no relation.
 directly.
 inversely.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.25.
 0.5.
 Greater than 1.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 DC series motor.
 DC compound motor.
 Separately excited DC motor.

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Electrical Machines
Universal motors are used in

 food processing
All of these
 cranes
 traction

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt generator.
 DC shunt motor.
  DC series generator.

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