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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,
both are of the same size for the same current rating
A is bigger than B for the same voltage rating
A is bigger than B for the same current rating
B is bigger than A for the same current rating
both are of the same size for the same current rating
A is bigger than B for the same voltage rating
A is bigger than B for the same current rating
B is bigger than A for the same current rating
Answer
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Related Question
Electrical Machines
In large sized DC machines the compensating windings are provided to
neutralize voltage induced in coil due to fluctuation of l
compensate for the decrease in speed due to increase of load.
None of these
reduce eddy current losses by providing local short circuits.
neutralize voltage induced in coil due to fluctuation of l
compensate for the decrease in speed due to increase of load.
None of these
reduce eddy current losses by providing local short circuits.
Answer
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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?
60%
38%
40%
68%
60%
38%
40%
68%
Answer
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Electrical Machines
For power factor improvement the synchronous motor is to be
heavily loaded and underexcited
heavily loaded and over excited
lightly loaded and over excited
lightly loaded and underecited
heavily loaded and underexcited
heavily loaded and over excited
lightly loaded and over excited
lightly loaded and underecited
Answer
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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?
Remains same.
Eight times.
Four times.
Doubled.
Remains same.
Eight times.
Four times.
Doubled.
Answer
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Electrical Machines
From no load to full load the slip will
None of these
slightly increase.
not change.
slightly decrease.
None of these
slightly increase.
not change.
slightly decrease.
Answer
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