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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  sf.
  f / s.
  s2.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 more than normal speed.
 zero.
 normal speed.
 less than normal speed.

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

 remain unchanged.
 reduce by 5 %.
 increase by 5 %.
 depend on other factors.

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Shaded pole IM.
  Split phase IM.
  Cage induction motor.

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Electrical Machines
The material used for commutator brushes is mostly

 copper.
 mica.
 cast iron.
  carbon.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

  region under main pole.
None of these
 interpole region.
 throughout the air gap.

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