The fundamental requirement of the spiral curve is that its radius of curvature at any point shall vary inversely as the distance from the beginning of the curve.

Related MCQs

• If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to
• Correction required for curvature for a distance of 1500 m is….
• Combined correction for curvature and refraction for 800 m distance is……
• In levelling, the correction for curvature (in metres) is equal, where D = Distance from the level to the staff reading in kilometres.
• When R is the radius of the curve (in metres), D is the degree of curve (in degrees) and length of the chord is 30 m, then the relation between R and D is
• The contour interval of any survey is inversely proportional to the scale of the map.
• The distance by which the last point of the traverse falls short to coincide with the starting point is called the closing error.
• The R.L, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is on the ceiling is 2.745 m, the R.L. of point B will be
• As applied to staff readings, the corrections for curvature and refraction are respectively The above table shows a part of a level field book. The value of X should be
• The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is