Lesson 9

Question 1

Are designed to provide smooth transition or gradual change in direction thus reducing the effect of inertia forces.

Answer 1

Curves

Question 2

Are susceptible to huge amount of centrifugal force which may cause them to skid or overturn

Answer 2

High speed vehicles

Question 3

These curves are on a horizontal plane viewed from the top.

Answer 3

HORIZONTAL CURVES

Question 4

These curves are used to provide smooth transition or gradual change in direction which takes place in a vertical plane die to grade changes.

Answer 4

VERTICAL CURVES

Question 5

Length of tangent,T

Answer 5

T = R tan(I/2)

Question 6

External Distance, E

Answer 6

E = R [sec(I/2) -1]

Question 7

Middle Ordinate, m

Answer 7

m = R [1 -cos(I/2)]

Question 8

Length of Long Chord, L

Answer 8

L = 2R sin(I/2)

Question 9

Length of Curve, Lc

Answer 9

Lc = πRI/180°

Question 10

Is the central angle subtended by an arc (arc basis) or chord (chord basis) of one station. It will define the sharpness of the curve.

Answer 10

Degree of curve

Question 11

In English system, 1 station is equal to ______

Answer 11

100 ft

Question 12

In SI, 1 station is equal to _______

Answer 12

20 m