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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then
its efficiency will improve
its speed will increase
its power factor will reduce
its speed will reduce
its efficiency will improve
its speed will increase
its power factor will reduce
its speed will reduce
Answer
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Related Question
Electrical Machines
The armature shaft must be able to withstand
bending moment due to weight of the armature.
twisting strains due to transmission of torque.
any unbalanced magnetic pull on the armature core.
All of these
bending moment due to weight of the armature.
twisting strains due to transmission of torque.
any unbalanced magnetic pull on the armature core.
All of these
Answer
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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because
the interpoles produce additional flux to augment the developed torque
a counter-emf is induced in the coil undergoing commutation
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the flux waveform is improved with reduction in harmonics
the interpoles produce additional flux to augment the developed torque
a counter-emf is induced in the coil undergoing commutation
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the flux waveform is improved with reduction in harmonics
Answer
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Electrical Machines
In a synchronous motor, damper windings are provided on
rotor shaft.
pole faces.
stator frame.
None of these
rotor shaft.
pole faces.
stator frame.
None of these
Answer
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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?
unshaded, unshaded
shaded, unshaded
shaded, shaded
unshaded, shaded
unshaded, unshaded
shaded, unshaded
shaded, shaded
unshaded, shaded
Answer
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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?
same phase sequence
same voltage magnitude
same prime mover speed
same frequency
same phase sequence
same voltage magnitude
same prime mover speed
same frequency
Answer
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