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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  P.
  Z.
  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.

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

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Capacitor type induction motors.
  DC series motor.
  Reluctance motor.
  AC slip ring IM.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 25 ppm.
 20 ppm.
  35 ppm.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 both 1 and 2
 excitation power only
 power due to saliency or reluctance only

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Electrical Machines
What are the starters used for starting of cage motors?

 Star-delta starter.
 DOL starter.
  All of these.
 Auto transformer starter.

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