1. A Spiral transition curve has a varying radius.
a) True
b) False
Explanation: The above statement, “A Spiral transition curve has a varying radius” is true. It starts with its radius at infinity and then ends at the radius of the circular curve.
2. If the degree of curvature is higher then the curve is ______
a) sharper
b) flatter
c) vertical
d) elliptical
Explanation: If the degree of curvature is higher then the curve is sharper. The severity of the circular horizontal curve is Degree of curvature.
3. What is the maximum side slope of cut and fill section where sandy soil is predominant?
a) 1:2
b) 3:1
c) 6:1
d) 10:1
Explanation: The maximum side slope of cut and fill section where sandy soil is predominant is 6:1. 3:1 is the maximum side slope of cut and fill section for the safe functioning of maintenance and mowing actions.
4. What is the maximum superelevation in snowy areas?
a) 5%
b) 6%
c) 3%
d) 8%
Explanation: The maximum superelevation in snowy areas is 8%. Superelevation is the total rise of roadway from edge to edge span of the roadway.
5.The value of side-friction factor varies with ______
a) design speed
b) superelevation
c) skidding
d) overturning
Explanation: The value of side friction varies with design speed. Side-friction factor also represents frictional forces that can be easily accomplished.
6. In how many stages does the transition from a tangent section to super-elevated horizontal curve takes place?
a) 3
b) 2
c) 4
d) 5
Explanation: In 2 stages, the transition from a tangent section to super-elevated horizontal curve takes place. Tangent runoff and superelevation runoff are the two stages of transition.
7. Length of the transition curve is the maximum of length due to _____
a) centrifugal force, superelevation, and empirical
b) centrifugal force, superelevation, and tangent
c) superelevation, centripetal, and empirical
d) superelevation, centripetal, and design speed
Explanation: Length of transition curve is the maximum of length due to centrifugal force, superelevation, and empirical. Transition curve is the horizontal curve provided between straight alignment to a circular curve for a smooth transition.
8. Which one of the following is not an advantage of spiral transition?
a) Easy path for drivers to follow
b) Aesthetics
c) Agreeable arrangement of superelevation runoff
d) Less delay
Explanation: Less delay is not an advantage of spiral transition. Easy path for drivers to follow, aesthetics, and agreeable arrangement of superelevation runoff are the advantages of spiral transition.
9. The distance from the centreline of the inside lane to the nearest roadside sight blockage is called.
a) Length of curve
b) Apex
c) Mid-ordinate
d) Tangent
Explanation: The distance from the centreline of the inside lane to the nearest roadside sight blockage is called Mid-ordinate. The formula for mid-ordinate is,
M = R(1-cos θ/2)
where, M = mid-ordinate
R = radius of curvature
θ = angle of deflection.
10. What are the two types of vertical curves?
a) Crest and sag
b) Crest and plume
c) Sag and sink
d) Sink and fall
Explanation: The two types of vertical curves are crest and sag. Crest, as the name suggests, is a vertical curve having its entry tangent grade greater than the exit tangent grade. While sag has its entry tangent grade smaller than its exit tangent grade.