Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The braking torque provided by a permanent ma...
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The braking torque provided by a permanent magnet in a single phase energy meter is proportional to the
i) square of the flux of the permanent magnet
ii) speed of the meter
iii) distance of he permanent magnet from the center of the revolving disc
Q. Which of the above statements are correct.
i) square of the flux of the permanent magnet
ii) speed of the meter
iii) distance of he permanent magnet from the center of the revolving disc
Q. Which of the above statements are correct.
- a)only i
- b)ii, ii
- c)ii, iii
- d)i, ii, iii
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The braking torque provided by a permanent magnet in a single phase en...
The braking torque is provided by the interaction of the eddy current and the field of the permanent magnet. this torque is directly proportional to the product of square of flux of the magnet, magnitude of eddy current and the effective radius R from the axis of the disc. braking torque is directly proportional to speed of rotation.
Most Upvoted Answer
The braking torque provided by a permanent magnet in a single phase en...
Explanation:
i) Square of the flux of the permanent magnet:
- The braking torque provided by a permanent magnet in a single phase energy meter is indeed proportional to the square of the flux of the permanent magnet. This is because the braking torque is directly related to the strength of the magnetic field produced by the permanent magnet, which is determined by the flux.
ii) Speed of the meter:
- The braking torque is also influenced by the speed of the meter. As the speed increases, the braking torque provided by the permanent magnet also increases. This is due to the fact that the induced current in the disc, which is responsible for producing the braking torque, is directly related to the speed of the meter.
iii) Distance of the permanent magnet from the center of the revolving disc:
- The distance of the permanent magnet from the center of the revolving disc also plays a role in determining the braking torque. The closer the permanent magnet is to the center of the disc, the stronger the magnetic field and hence the braking torque will be.
Therefore, all the statements mentioned in the question are correct. The braking torque provided by a permanent magnet in a single phase energy meter is proportional to the square of the flux of the permanent magnet, the speed of the meter, and the distance of the permanent magnet from the center of the revolving disc.
i) Square of the flux of the permanent magnet:
- The braking torque provided by a permanent magnet in a single phase energy meter is indeed proportional to the square of the flux of the permanent magnet. This is because the braking torque is directly related to the strength of the magnetic field produced by the permanent magnet, which is determined by the flux.
ii) Speed of the meter:
- The braking torque is also influenced by the speed of the meter. As the speed increases, the braking torque provided by the permanent magnet also increases. This is due to the fact that the induced current in the disc, which is responsible for producing the braking torque, is directly related to the speed of the meter.
iii) Distance of the permanent magnet from the center of the revolving disc:
- The distance of the permanent magnet from the center of the revolving disc also plays a role in determining the braking torque. The closer the permanent magnet is to the center of the disc, the stronger the magnetic field and hence the braking torque will be.
Therefore, all the statements mentioned in the question are correct. The braking torque provided by a permanent magnet in a single phase energy meter is proportional to the square of the flux of the permanent magnet, the speed of the meter, and the distance of the permanent magnet from the center of the revolving disc.
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The braking torque provided by a permanent magnet in a single phase energy meter is proportional to thei) square of the flux of the permanent magnetii) speed of the meteriii) distance of he permanent magnet from the center of the revolving discQ.Which of the above statements are correct.a)only ib)ii, iic)ii, iiid)i, ii, iiiCorrect answer is option 'D'. Can you explain this answer?
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