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Electrical Machines

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

 120°.
 90°.
 60°.
 30°.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 40%
 60%
 68%
 38%

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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
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 S
 1/S
 1-S

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
  decreases.
  increases upto a limit and then remains almost constant.
 increases.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 co- sinusoidal
 rectangular
 sinusoidal

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MORE MCQ ON Electrical Machines

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