Civil Engineering :: Surveying
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A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic
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While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be
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In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per 30 metre tape duly corrected for temperature, slope and sag, the angular error of closure not to exceed (where n is the number of traverse legs)
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Straight, parallel and widely spaced contours represent
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The theodolites used for making tacheometric observations by optical wedge system, are
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Resolving power of a telescope depends on
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If 50 m point of a 100 m tape is 50 cm off line, and 50 m sections are straight, an error is generated equal to
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Pick up the correct statement from the following :
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If Δ is the angle of deflection of a simple curve of radius R, the distance between the mid-point of the curve and long chord, is
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The 10 mm markings on a levelling staff placed at 20 m are separated by
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A.
with both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from knots |
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B.
the follower of the chaining operation should be more experienced than the leader |
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C.
at the end of the tenth chain length, the two chain men meet and the ten arrows are handed over to the leader |
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D.
all the above. |