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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 3 to 5.
 2 to 3.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 4 time the initial value
 twice the initial value
 1/2 of the initial value

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 smoother acceleration.
 more starting time.
 more starting torque.

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

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

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Electrical Machines
A 3 - Φ slip ring motor has

  any of the above.
  short-circuited rotor.
  wound rotor.
  double cage rotor.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque decreases
 less and maximum torque increases
 more and maximum torque remains constant
 more and maximum torque decreases

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