Civil Engineering MCQAE Level Civil Engineering
If V is the speed in km/hour and R is the radius of the curve, the super-elevation e is equal to
Transportation EngineeringTransportation EngineeringMEDIUM
Choose the correct answer
A
V²/125R
B
V²/225R
C
V²/325R
D
V²/25R
Correct Answer
B. V²/225R
Why is this the answer?
IRC superelevation formula (neglecting lateral friction): e = V^2 / (225*R), where V = design speed (km/h) and R = radius of horizontal curve (m). Derived from IRC equilibrium equation: e + f = V^2/(127R); setting f = 0 gives this formula. Max superelevation: 0.07 (plain/rolling terrain), 0.10 (hill roads) per IRC 38:2019. IRC superelevation e = V^2/(225R).
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.