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UPSC Civil Service Exam Questions - Engineering

Q1:

A summit curve is formed at the intersection of a 3% upgrade and a 5% downgrade. What is the length of the summit curve in order to provide a stopping distance of 128 m ?

A 271m

B 298 m

C 322 m

D 340 m

ANS:B - 298 m

The total change in grade = 0.03 + 0.05 = 0.08for the consideration L>S. L= NS^2/4.4 = 0.08 * 128 * 128/4.4 = 297.8 m.