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Electrical Machines

Electrical Machines
From no load to full load the slip will

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

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

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

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 none of above.
 rheostatic control.
 any of above method.

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/4S
 PZL/4SP²
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
  load.
 speed.
  voltage.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Remain unchanged.
 Reduce by 5%.
  Increase by 5%.
 Depends on other factor.

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