Civil Engineering :: Surveying
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An imaginary line lying throughout on the surface of the earth and preserving a constant inclination to the horizontal, is called
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An angles of 45° with a chain line may be set out with
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Pick up the correct statement from the following :
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The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as
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A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be
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The bearing of C from A is N 30° E and from B, 50 metres east of A, is N 60° W. The departure of C from A is
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Pick up the correct statement from the following :
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The rise and fall method of reduction of levels, provides a check on
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In tangential tacheometry, an ordinary level staff is used
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The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as
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A.
spherical aberration may be reduced by diminishing the aperture |
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B.
spherical aberration may be minimised by replacing the single lens by a combination of the lenses. |
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C.
in telescope objectives, a combination of convex lens and concave lens is used. |
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D.
in eyepieces, two plano-convex lenses placed at a certain distance apart are used |
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E.
all the above. |