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Electrical Machines

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

 400 A.
 44 A.
 440 A.
 40 A.

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Electrical Machines
Hysteresis loss is proportional to

 f2.
  f.
 f1.5.
 f3.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
 interpole region.
 throughout the air gap.
  region under main pole.

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Electrical Machines
Dynamic braking is employed to brake

 reversing drive
None of these
 both 1 and 2
 non reversing drive

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Electrical Machines
Dummy coils are used for

 increasing efficiency.
 reducing armature reaction.
All of these
 mechanical balancing.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 2
 2 and 3
 1, 2 and 3
 1 and 3

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