Civil Engineering :: Surveying
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α, β are the horizontal angles measured at the ends of a base line AB to a hill top whose angle of elevation from station A is θ°. The height of the hill top above the trunnion axis of the theodolite station, is
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Correct distance obtained by an erroneous chain is:
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For preparation of a contour plan for a route survey
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Flint glass
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The zero of the graduated circle of a prismatic compass is located at
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A standard steel tape of length 30 m and cross-section 15 x 1.0 mm was standardised at 25°C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of steel tape is 2.2 x 106 kg/cm2, the correction to be applied is
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The bearing of AB is 190° and that of CB is 260° 30'. The included angle ABC, is
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The power of a lens
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In an adjusted level, when the bubble is central, the axis of the bubble tube becomes parallel to
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If h is the difference in height between end points of a chain of length l, the required slope correction is
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A.
\(\frac { \text{ Erroneous chain length} } {\text{ correct chain length} } \) x observed ditance |
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B.
\(\frac { \text{ correct chain length } } {\text{ Erroneous chain length} } \) x observed distance |
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C.
\(\frac { \text{ correct chain length } } {\text{ observed distance} } \) x Erroneous chain length |
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D.
none of these. |