Civil Engineering MCQAE Level Civil Engineering
On a horizontal curve of radius R, the superelevation e (as a fraction) and lateral friction f are related to the design speed V (m/s) by:
Transportation EngineeringSuperelevationMEDIUM
Choose the correct answer
A
e + f = V^2 / (g x R)
B
e + f = V / (g x R)
C
e - f = V^2 / gR
D
e = V^2 / gR (friction ignored)
Correct Answer
A. e + f = V^2 / (g x R)
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
IRC 73 formula: e + f = V^2/(gR), where e = rate of superelevation (fraction), f = design coefficient of lateral friction (0.15 for IRC), V in m/s, g = 9.81 m/s2, R = radius in m. Maximum superelevation = 7% (IRC) to 10% (hilly terrain).
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Concept shortcut
IS/IRC reference
Common trap
Practice more Civil Engineering questions
This MCQ belongs to AE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.