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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 0 V
 2 V
 4 V

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 110 VA
 100 VA
 550 VA
 500 VA

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Series shunt.
 Cummulative compound.
  Differentical compound.
 have an equal number of electrons and protons.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 234.76 N-m.
 266.20 N-m.
 can not be determined.
 133.22 N-m

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Electrical Machines
DC shunt motors are suitable for

  All of this.
 Lathes.
 Blowers and fans.
 Centrifugal pumps

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Electrical Machines
Which of the following statements is/are correct ?

None of these
 Inter pole winding will act in interpolar region.
 Both A and B.
 Compensating winding will act under the pole.

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