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Electrical Machines

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

 60°.
 120°.
 90°.
 30°.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/3
 1/√3, 1/√3

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
  Full load.
 None of these.
 No load.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only field terminals are changed.
  none of above.
  either field terminals are reversed or armature terminals are reversed.
  only armature terminals are reversed.

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Electrical Machines
Dummy coils are used for

All of these
 reducing armature reaction.
 mechanical balancing.
 increasing efficiency.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thick
 large and thin

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