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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
  40 A.
 400 A.
 44 A.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 auto transformer.
 two winding transformer with secondary short circuited.
None of these

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

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 384 V
 96 V
 768 V

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.
None of these
 The leakage reactance of the induction motor should be small.

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Electrical Machines
DC machine windings are

 short pitched
None of these
 either of these
 full pitched

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