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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 18°
 30°
 72°

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Electrical Machines
Universal motors are used in

All of these
 traction
 food processing
 cranes

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Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 hysteresis loss.
 eddy current loss.
 both 1 and 2.

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 30°.
 45°.
  10°.
 24°.

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Electrical Machines
What is the effect of armature reaction ?

 None of the options.
 Armature flux weakens the main field flux.
  Both option B and C.
 Armature flux distorts the main field flux.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech
 θelec = 2/P*θmech

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MORE MCQ ON Electrical Machines

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