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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

 40 A.
 440 A.
 44 A.
 400 A.

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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, 2, 3, 4
 2, 3, 4
 1, 3, 5
 1, 2, 5

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 a positive finite value
 a finite negative value
 ∞

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 below rated speed.
 in one direction only.
 in both direction.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 None of above.
 Remain unchanged
 Increases.
 Decreases.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at half load.
 copper loss at full load.
  copper loss at any load.
 copper loss at over load.

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