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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as
hum.
boo.
zoom.
magnetostriction.
hum.
boo.
zoom.
magnetostriction.
Answer
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Electrical Machines
The mechanical power is developed by a DC motor is maximum when
none of above.
back emf is equal to half of applied voltage.
back emf is equal to twice of applied voltage.
back emf is equal to applied voltage.
none of above.
back emf is equal to half of applied voltage.
back emf is equal to twice of applied voltage.
back emf is equal to applied voltage.
Answer
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Electrical Machines
In large sized DC machines the compensating windings are provided to
compensate for the decrease in speed due to increase of load.
reduce eddy current losses by providing local short circuits.
None of these
neutralize voltage induced in coil due to fluctuation of l
compensate for the decrease in speed due to increase of load.
reduce eddy current losses by providing local short circuits.
None of these
neutralize voltage induced in coil due to fluctuation of l
Answer
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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.
266.20 N-m.
234.76 N-m.
cant be determined.
133.22 N-m
266.20 N-m.
234.76 N-m.
cant be determined.
133.22 N-m
Answer
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Electrical Machines
In DC generators brushes are used for
collecting of voltage
reduce eddy current loss
collecting of current without any sparkings
convert ac armature current in to dc
collecting of voltage
reduce eddy current loss
collecting of current without any sparkings
convert ac armature current in to dc
Answer
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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their
turn- ratios are exactly equal
polarities are properly connected
KVA ratings are equal
percentage impedances are equal
turn- ratios are exactly equal
polarities are properly connected
KVA ratings are equal
percentage impedances are equal
Answer
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