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Which of the following is the direct measure of surface finish in Wallace surface dynamometer?

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Which of the following is the direct measure of surface finish in Wallace surface dynamometer?

(a) Time of swing

(b) Angle of swing

(c) Length of swing

(d) Height of swing

The question was posed to me during an online exam.

The query is from Methods of Measuring Surface Finish in division Measurement of Surface Finish of Engineering Metrology

1 Answer

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Best answer
The correct choice is (a) Time of swing

The best explanation: In the case of Wallace surface dynamometer, if the surface to be tested is smooth, there will be less friction and pendulum swings for a longer time period. So, time of swing of pendulum is a direct measure of surface finish.

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