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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of
100 V.
400 V.
800 V.
200 V.
100 V.
400 V.
800 V.
200 V.
Answer
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Related Question
Electrical Machines
The effect of ------------------ on main field flux is armature reaction?
armature flux
All of these
armature mmf
armature current
armature flux
All of these
armature mmf
armature current
Answer
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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.
50 V.
100 V.
230.2 V.
399 V.
50 V.
100 V.
230.2 V.
399 V.
Answer
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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids
both (A) and (B).
consists of short-circuited copper bars embedded in the field pole faces.
are provided on the stator for improving power factor.
are provided in a synchronous motor to make it self starting.
both (A) and (B).
consists of short-circuited copper bars embedded in the field pole faces.
are provided on the stator for improving power factor.
are provided in a synchronous motor to make it self starting.
Answer
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Electrical Machines
Iron losses in a DC machine are independent of variation in
voltage.
speed and voltage.
speed.
load.
voltage.
speed and voltage.
speed.
load.
Answer
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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of
running torque.
speed regulation.
efficiency.
starting torque.
running torque.
speed regulation.
efficiency.
starting torque.
Answer
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