What is the main purpose of a curve in surveying?
B
To connect two straight lines smoothly
C
To measure distances accurately
D
To set out a boundary line
Analysis & Theory
Curves are used in roads and railways to provide a smooth transition between straight paths.
Which of the following is a **horizontal curve**?
Analysis & Theory
Simple circular curves are horizontal curves that connect two straight tangents.
Vertical curves are used to:
A
Change elevation gradually
B
Change direction horizontally
D
Increase the grade of road
Analysis & Theory
Vertical curves provide gradual elevation changes in roads or railways.
A curve formed by a single arc with constant radius is called:
Analysis & Theory
A simple curve consists of a single arc of constant radius.
In a simple circular curve, the point of intersection of two tangents is called:
Analysis & Theory
The point where two straight tangents meet is called the point of intersection (PI).
The central angle subtended by the arc of a curve is called:
Analysis & Theory
The central angle or deflection angle is the angle subtended at the center by the curve.
The length of a curve depends mainly on:
B
Radius and deflection angle
Analysis & Theory
Length of a curve is calculated using the radius and central angle (in radians or degrees).
Which of the following is used to provide a gradual change from a straight line to a circular curve?
Analysis & Theory
Transition curves ensure a smooth entry into the circular curve by gradually changing curvature.
A reverse curve consists of:
A
Two curves in the same direction
B
Two curves with different radii in the same direction
C
Two curves in opposite directions with a common tangent
D
A curve and a straight line
Analysis & Theory
Reverse curves are two arcs bending in opposite directions connected by a common tangent.
Which method is commonly used to set out a circular curve in the field?
C
Deflection angle method
Analysis & Theory
The deflection angle method is widely used to set out curves using a theodolite or transit.