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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.9 lag
 0.2 lag
 0.2 lead

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of transformer oil.
  condition of transformer.
 condition of bushings.
 condition of bushing stud.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 4.8% and -3.2%
 6% and -4%
None of these
 3.2% and -1.6%

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 power due to saliency or reluctance only
 both 1 and 2
None of these
 excitation power only

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Electrical Machines
The polarity of a DC generator can be reversed by

 increasing field current.
 reversing the field current.
 reversing field electric current as well as direction of rotation.
 any of above.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 1/V
 supply voltage V
 V²

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MORE MCQ ON Electrical Machines

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