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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids
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.
both (A) and (B).
consists of short-circuited copper bars embedded in the field pole faces.
Answer
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Related Question
Electrical Machines
A short circuit test on a transformer gives
copper loss at half load.
copper loss at full load.
copper loss at over load.
copper loss at any load.
copper loss at half load.
copper loss at full load.
copper loss at over load.
copper loss at any load.
Answer
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Electrical Machines
The heat transfer by convection in a transformer least depends on
temperature difference.
surface area.
air velocity.
color of the paint.
temperature difference.
surface area.
air velocity.
color of the paint.
Answer
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Electrical Machines
The DC compound motors are generally
Level Compound.
Differentical compound.
Cummulative compound.
None of these.
Level Compound.
Differentical compound.
Cummulative compound.
None of these.
Answer
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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is
83.33 KVA
100 KVA
50 KVA
123.3 KVA
83.33 KVA
100 KVA
50 KVA
123.3 KVA
Answer
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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small
to achieve a stronger magnetic field.
to avoid over heating.
All of these
to avoid locking of the armature.
to achieve a stronger magnetic field.
to avoid over heating.
All of these
to avoid locking of the armature.
Answer
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