Civil Engineering :: Surveying
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One of the Lehmann's rules of plane tabling, is
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If f1 and f2 are the distances from the optical centre of a convex lens of focal length f to conjugate two points P1 and P2 respectively, the following relationship holds good
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The accuracy of measurement in chain surveying, does not depend upon
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If arithmetic sum of latitudes of a closed traverse is ˆ‘Lat and closing error in latitude is dx, the correction for a side whose latitude is l, as given by Transit Rule, is
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Closed contours of decreasing values towards their centre, represent
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If a 30 m chain diverges through a perpendicular distance d from its correct alignment, the error in length, is
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Diopter is the power of a lens having a focal length of
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An imaginary line joining the points of equal elevation on the surface of the earth, represents
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The 'fix' of a plane table station with three known points, is bad if the plane table station lies
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If R is the radius of the main curve, θ the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is
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A.
location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances |
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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 |
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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 |
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D.
none of these. |
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