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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / E2
 (V2 - E2) / V2
 (E2 - V2) / E2

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
 salient pole motor
 cylindrical motor
None of these

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the hysteresis loss.
 to reduce the inductor.

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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

  18.
 80.
 50.
 36.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
 average value.
 total value.
  maximum value.

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 not dependent on the slip
 either of these
 inversely proportional to slip

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