M

Mr. Dubey • 52.30K Points
Coach 

Q. 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
Correct : Option (A)

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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