If R is the radius of the main curve, ? the angle of deflection, S the shift and

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Question
If R is the radius of the main curve, ? the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is
Options
A. (R - S) tan ?/2 - L/2
B. (R + S) tan ?/2 - L/2
C. (R + S) tan ?/2 + L/2
D. (R - S) tan ?/2 + L/2
E. (R - S) cos ?/2 + L/2

Correct Answer

(R + S) tan ?/2 + L/2

Surveying problems

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2. The real image of an object formed by the objective, must lie
Options
A. in the plane of cross hairs
B. at the centre of the telescope
C. at the optical centre of the eye-piece
D. anywhere inside the telescope.

4. In chain surveying tie lines are primarily provided
Options
A. to check the accuracy of the survey
B. to take offsets for detail survey
C. to avoid long offsets from chain lines
D. to increase the number of chain lines.

5. Pick up the correct statement from the following :
Options
A. the apparent error on reversal is twice the actual error
B. the correction may be made equal to half the observed discrepancy.
C. the good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results
D. all the above.

6. While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
Options
A. correctly focussed
B. not correctly focussed
C. said to have parallax
D. free from parallax.

9. One of the Lehmann's rules of plane tabling, is
Options
A. location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
B. when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray
C. when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays
D. none of these.

10. Pick up the correct statement from the following :
Options
A. Box sextant is used for the measurement of horizontal angles
B. Cross staff is used for setting out right angles
C. Gradiometer is used for setting out any required gradient
D. Line ranger is used for locating intermediate stations on a survey line
E. All the above.

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