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Electrical Machines

Electrical Machines
The torque developed in IM is nearly proportional to

  1 / V.
 1 / V2.
  V2.
  V.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Dummy coils.
 Commutator.
 Equalizer rings.

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

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

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 All of the them
 Friction and windage losses
 Eddy current losses

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Electrical Machines
Rotating part of DC motor is known as

 Starter.
 Carbone brush.
 Pole.
 Armature.

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor resistance R
None of these
 rotor reactance X

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