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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 wave winding
None of these
 lap winding
 both 1 and 2

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Electrical Machines
Tap changer is generally provided in

  power transformer.
 current transformer.
 voltage transformer.
 earthing transformer.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 increases with increase in the load torque.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Zero
 S.Ns
 Nr

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 Separately excited DC motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 reduce pulsation loss.
 reduce iron weight.
 dissipate more heat.

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