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Electrical Machines

Electrical Machines
Example of double excited machine is

None of these
 Both are correct.
 Synchronous motor.
 DC Shunt Motor

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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.
 400 A.
 44 A.
  40 A.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 limit the armature current.
 control field current.
 none of above.
 vary the armature resistance.

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 neither 1 nor 2
 ball bearings → small machines
 both A and B

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 3, 5
 2, 3, 4
 1, 2, 3, 4
 1, 2, 5

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
  DC series.
 Induction motor.
 DC compound.

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