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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 28 W.
 30 W.
 25 W.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 2 to 3.
 1.0.
 3 to 5.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically and statically induced emf.
 dynamically induced emf.
None of these

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Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Domestic pump.
  Lift.
  Traction.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

  hum.
 boo.
 magnetostriction.
 zoom.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 None of above.

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