railway RRB JE (CBT I + CBT II) Mock Test 2024 Basic Science and Engineering Levers and Simple Machines
Which of the following is the correct expression to find the effort lost in actual machines due to friction compared to ideal lifting machines?
(V. R. = velocity ratio of the machine, W = load, η = efficiency of the machine)
1
\(\)\(\frac{V \cdot R \cdot}{W}\left(\frac{1}{\eta}-1\right)\)
2
\(\frac{W}{V \cdot R \cdot}\left(\frac{\eta}{2}\right)\)
3
\(\frac{W}{V \cdot R \cdot}\left(\frac{1}{\eta}-1\right)\)
4
\(\frac{W}{V \cdot R \cdot}\left(\frac{\eta}{2}-1\right)\)