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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
 slightly increase.
None of these

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

  hum.
 boo.
 zoom.
 magnetostriction.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

 pole chamfering
 pole stacking
All of these
 compensating winding

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Electrical Machines
Field weakening method is also called as-----------?

 constant current control
 constant voltage control
 constant torque control
 constant power control

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
 Starting torque.
 Starting torque, operating speed, full load current.
  Full load current.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Bush bearings.
  Cast iron bearings.
  Ball bearings.

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