Question

A piston of `796 mm` diameter and `200 mm` long works in a cylinder of `800 mm` diameter as shown in figure. If the annlar spece is flled with a lubicating oil of viscosity `5` centipolses, calculate the constant speed (nearest to integer) of descent of piston in vertical position. The weight of piston and the axial load are `9.8 N`.

Answer 1

Correct Answer - `8`
`F = etaA (DeltaV)/(DeltaZ)`
`9.8 = 5 xx 10^(-3)pi xx 796 xx 10^(-3) xx 200 xx 10^(-3) xx (v)/(2 xx 10^(-3))`
`v = 7.841 m//s`