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Surveying - Engineering

Q1:

Rankine's deflection angle in minutes is obtained by multiplying the length of the chord by

A degree of the curve

B square of the degree of the curve

C inverse of the degree of the curve

D none of these.

ANS:A - degree of the curve

Da = (D *C) ÷ 200.

Where
Da= deflection angle,
D= degree of curve,
C = Length of Chord. Using 30m arc or chord definition the degree of curve D = 1718.9/R.
And the Rankine's deflection angle for the chord of length S is S*1718.9/R.
Hence, option A is correct.