LESSON 9: CURVES

Question 1

In the design of roads, railways, or canals, _____ are designed to provide smooth transition or gradual change in direction thus reducing the effect of inertia forces.

Answer 1

curves

Question 2

High speed vehicles are susceptible to huge amount of ______ force

Answer 2

centrifugal

Question 3

Centrifugal force may cause vehicles to skid or overturn. Providing a _____ will lessen this force.

Answer 3

transition

Question 4

Horizontal curves are on a horizontal plane viewed from the ____.

Answer 4

top

Question 5

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

Answer 5

smooth, gradual

Question 6

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 6

Degree of Curve, D

Question 7

In English system, 1 station is equal to _____

Answer 7

100 ft.

Question 8

In SI, 1 station is equal to ____

Answer 8

20 m.

Question 9

_____ is used in highways.

Answer 9

Arc Basis

Question 10

______ definition is used in railway design.

Answer 10

Chord Basis

Question 11

In this, the degree of curve is the central angle subtended by one station length of chord.

Answer 11

Chord Basis

Question 12

In Arc basis, the degree of curve is the central angle subtended by one station of ____ arc.

Answer 12

circular

Question 13

2 general forms of vertical curves

Answer 13

1. convex or summit curves
2. concave or sag curves