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Electrical Machines
In large sized DC machines the compensating windings are provided to
neutralize voltage induced in coil due to fluctuation of l
None of these
compensate for the decrease in speed due to increase of load.
reduce eddy current losses by providing local short circuits.
neutralize voltage induced in coil due to fluctuation of l
None of these
compensate for the decrease in speed due to increase of load.
reduce eddy current losses by providing local short circuits.
Answer
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Related Question
Electrical Machines
Why are capacitors used with large AC induction motor?
Improve current level.
Improve power factor.
Improve voltage level.
Improve power level.
Improve current level.
Improve power factor.
Improve voltage level.
Improve power level.
Answer
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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then
I1 < I2
None of these
I1 > I2
I1 = I2
I1 < I2
None of these
I1 > I2
I1 = I2
Answer
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Electrical Machines
Which of the following motors are suitable for computer printer drive ?
Stepper motor.
Hysteresis motor.
Shaded pole motor.
Reluctance motor.
Stepper motor.
Hysteresis motor.
Shaded pole motor.
Reluctance motor.
Answer
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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is
2, 4, 5, 6
1, 2, 5
3, 4, 5
2, 3, 6
2, 4, 5, 6
1, 2, 5
3, 4, 5
2, 3, 6
Answer
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Electrical Machines
To avoid formation of grooves in the commutator
brush position has no effect on the commutator grooving.
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
None of these
brush position has no effect on the commutator grooving.
the brushes of same polarity should track each other.
the brushes of opposite polarity should track each other.
None of these
Answer
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