On a straight railway track, absolute levels at point A on two rails are 100.550 m and 100.530 m and the absolute levels at point B 100 m apart are 100.585 m and 100.515 m respectively, the value of twist of rails per metre run, is
A)0.4 mm
B)0.5 mm
C)0.7 mm
D)0.8 mm

Question

Quizplus · Accepted Answer

The twist per metre run can be calculated by finding the difference in level between the two rails at points A and B, and then finding the difference between these differences. For point A, the difference is $100.550 m - 100.530 m = 0.020 m$. For point B, the difference is $100.585 m - 100.515 m = 0.070 m$. The change in difference over 100 m is $0.070 m - 0.020 m = 0.050 m$ or 50 mm. Therefore, the twist per metre run is $50 mm / 100 m = 0.5 mm/m$.

On a Straight Railway Track, Absolute Levels at Point a on Two