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Electrical Machines
Silicon content in steel lamination is kept within 5% as it
Increases cost.
makes the material brittle.
All of these
increases hysteresis loss.
Increases cost.
makes the material brittle.
All of these
increases hysteresis loss.
Answer
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Related Question
Electrical Machines
The damper windings also called the squirrel cage windings or damper grids
are provided on the stator for improving power factor.
both (A) and (B).
consists of short-circuited copper bars embedded in the field pole faces.
are provided in a synchronous motor to make it self starting.
are provided on the stator for improving power factor.
both (A) and (B).
consists of short-circuited copper bars embedded in the field pole faces.
are provided in a synchronous motor to make it self starting.
Answer
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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then
E ∝ φf
E ∝ φ/f
E ∝ 1/(φf)
E ∝ f/φ
E ∝ φf
E ∝ φ/f
E ∝ 1/(φf)
E ∝ f/φ
Answer
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Electrical Machines
Which 1 - Φ motor does operate at high power factor?
Capacitor start.
Capacitor run.
Shaded pole.
Split phase.
Capacitor start.
Capacitor run.
Shaded pole.
Split phase.
Answer
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Electrical Machines
The flux involved in the emf equation of a transformer has
maximum value.
rms value.
average value.
total value.
maximum value.
rms value.
average value.
total value.
Answer
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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?
120°.
90°.
30°.
60°.
120°.
90°.
30°.
60°.
Answer
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