Surveying Questions and Answers – Setting out Simple Curves

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Setting out Simple Curves”.

1. Which among the following indicates the correct set of methods for setting out a simple curve?
a) Angular method, curvature method
b) Linear method, angular method
c) Curvature method, linear method
d) Tangent method, curvature method

Explanation: The methods involved in setting out a curve can be given as linear method, angular method and instrument method is also involved which is capable of providing accurate information.

2. In linear method of setting out curve, which of the following is not used?
a) Tape
b) Chain
c) Theodolite
d) Compass

Explanation: Theodolite is an instrument that is used for computing angles or bearings between the lines which are used for further calculation in computing the distance between the points. Whereas tape, chain can be directly used for determining the distance.

3. Which of the following methods is used when curve to be designed is short?
a) Linear method
b) Angular method
c) Tangent method
d) Curvature method

Explanation: Linear method adopts the usage of chain or tape in which only distance can be found but not angles. Moreover, this process is used when accuracy is not required and speed of work is concerned.

4. In angular method of setting a curve, which of the following is used?
a) Compass
b) Tape
c) Chain
d) Theodolite

Explanation: The angular method of setting out a curve involves finding out the angles between the lines, which is required for further assessment. Before measuring angles it is essential to set the required asserts.

5. For setting the tangent, which process is most commonly used?
a) Rankine’s method
b) Trial and error method
c) Tacheometric method
d) Two theodolite method

Explanation: Though trial and error method is a tedious process, it is mostly used in all methods of setting a tangent because it involves accuracy and might be able to deliver the best output through calculation.
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6. P.T, P.I, P.C are the basic requirements for setting a curve.
a) True
b) False

Explanation: The point of curvature, point of tangency, point of intersection are basic requirements which are used for setting out curve, tangents by placing instrument at that point based on our requirement.

7. Which of the following doesn’t indicate the linear method of setting out the curve?
a) By offsets from chords produced
b) By offsets from the tangents
c) By curves
d) By offsets of long chords

Explanation: The linear methods of setting out the curve involve setting by offsets, offsets by tangents, offsets by long chords, offsets by deflection distances which are applied based on the area they are dealing with and output necessary.

8. Find the value of radius if the value of D is given as 23.76m.
a) 214.98m
b) 241.61m
c) 214.16m
d) 241.16m

Explanation: The value of radius with respect to only radius can be given as,
R = 5730/D. On substitution, we get
R = 5730 / 23.76
R = 241.16 m.

9. Find the value of length of the curve if the degree of curve is taken at 20m arc with an angle 42˚12ꞌ.
a) 24.9m
b) 24.2m
c) 42.2 m
d) 49.2m

Explanation: The value of the length of the curve at an arc which is designated at 20 m can be given as, l = 20*θ / D. On substitution, we get
l = 20*42˚12ꞌ / 20
l = 42.2 m.

10. The length of the chord must not be greater than one tenth of radius.
a) True
b) False

Explanation: In order to have a better accuracy in the output, the length of the chord must not be greater than one-tenth of the radius. Reduce in error will be at a great extent for example 8mm in 20m length.

11. Using the degree of curvature, find the value of radius of curve if the distance is given as 24.65 m.
a) 64.49m
b) 46.49m
c) 46.94m
d) 64.94m

Explanation: In degree of curvature, the value of radius can be designated by using 20m arc length. The formula is given as R = 1146 / D. On substitution, we get
R = 1146 / 24.65 = 46.49 m.

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