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Electrical Machines

Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 Greater than 90°
 90°
 less than 90°
 0°

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Shunt motors.
 Both B and C.
 Differential compound motors.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Peaky in nature.
 Triangular and directed towards main pole.
 Triangular and directed towards brush axis.
 Saddle shape.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 10
 12
 5

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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?

 38%
 40%
 68%
 60%

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Electrical Machines
The armature of DC motor is laminated

 to reduce the inductor.
 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.

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