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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Resistance split phase
 Capacitor start
 Capacitor run

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 51.5Hz
 2.5Hz
 48.5Hz
 1.5Hz

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Electrical Machines
In an ideal DC generator the regulation is

 low.
 positive.
 high.
 zero.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 10 KW.
 8 KW.
  2 KW.
 0.

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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

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

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

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