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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
 BYR
 RBY
All of these

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

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

  Shunt.
 Series.
 Differntical compound.
 Cummulative compound.

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Electrical Machines
Lamination of core are generally made of

 silicon steel.
 cast iron.
 carbon.
 stainless steel.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.
 shaft rotation is high.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Resistance split phase motor
 Capacitor start motor

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