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Electrical Machines

Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 zoom.
 boo.
  hum.
 magnetostriction.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor will

 increase.
 none of these.
 remains same.
 Decrease.d

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
 Armature.
 Yoke.
  Commutator.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 inversely as applied voltage
 directly as square of applied voltage
None of these
 directly as applied voltage

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Electrical Machines
Example of double excited machine is

 Synchronous motor.
None of these
 DC Shunt Motor
 Both are correct.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
  Full load current.
 Full load torque.
 Full load speed.

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