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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f1.6
 f
 f³
 f²

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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

 500 VA
 550 VA
 110 VA
 100 VA

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 36.
 50.
  18.
 80.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increase proportional.
 remains constant.
 reduce slightly.
 increased slightly.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 250 A.
 570 A.
 340 A.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overload.
  overheating of winding.
  poor lubrication.
  uneven air gap.

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