Cubic spiral – Essaylink

A.Generally the transition curve used on highways is

(a) Cubic spiral (b) cubic parabola

(c) Bernoulli’s lemniscate (d) Both (a) and (b)

B. A parabola is best suited for a vertical curve, since

(a) it provides a longer sight distance

(b) rate of change of grade is uniform throughout

(c) smooth riding condition are provided

(d) All of the above

C. In the limiting case of overturning, while traversing a simple circular curve by a

vehicle, pressure below the

(a) outer wheels will be zero

(b) outer wheels will be maximum (c) outer and inner wheels will be same

(d) inner wheels will be maximum

D. If the angle of intersection and radius of a simple curve are 120° and 700 m

respectively, then which of the following statement(s) is/are true?

(i) Length of long chord is 700 m

(ii) Length of curve is 350 m

(a) Only (i) is correct (b) Only (ii) is correct

(c) Both (i) and (ii) are correct (d) None is correct