Civil Engineering MCQJE Level Civil Engineering

The 'slope' at the free end of a cantilever beam of span L, EI, under end point load P is:

Strength of MaterialsStrength of MaterialsMEDIUM

Choose the correct answer

A

θ = PL³/(3EI) (this is the deflection formula)

B

θ = PL²/(2EI) — slope at free end of cantilever under end point load

C

θ = PL/(EI)

D

θ = 2PL²/(EI)

Correct Answer

B. θ = PL²/(2EI) — slope at free end of cantilever under end point load

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Cantilever deflection: slope at free end θ = PL²/(2EI); deflection at free end δ = PL³/(3EI). For cantilever under UDL w: θ = wL³/(6EI), δ = wL⁴/(8EI). Mohr''s theorems: (1) change in slope = area of M/EI diagram; (2) deflection = moment of M/EI area about reference. Standard results used in superposition (e.g. propped cantilever analysis).

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