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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 hysteresis loss
 copper loss
 eddy current loss

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

  Decrease in weight/KVA.
 Reduced iron loss.
 Increase in weight/KVA.
 Reduced copper loss.

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Electrical Machines
Satisfactory commutation of DC machine requires

All of these
 brushes should smoothly run in the holders.
 brushes should be of proper grade and size.
 smooth, concentric commutator properly undercut.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 interchanging the capacitor from starting winding to main winding or vice versa.
All of these
 reversing the terminals of main winding.
 reversing the terminals of starting winding.

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Newtons law.
 Amperes law.
 Coulombs law.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 motor field terminal.
 generator field terminal.
 generator armature terminal.

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MORE MCQ ON Electrical Machines

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