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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Fibre.
 Mild steel.
 Cast iron.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get saturated.
All of these
 In order to not to get saturated.
 In order to get more flux.

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC compound motor.
 DC shunt motor with armature resistance.
 DC shunt motor with field weaking control.
 DC series motor.

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

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

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only armature terminals are reversed.
  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only field terminals are changed.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 more.
 between 50% and 90%.
 same.

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MORE MCQ ON Electrical Machines

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