Civil Engineering :: Surveying
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The sum of the interior angles of a geometrical figure laid on the surface of the earth differs from that of the corresponding plane figure only to the extent of one second for every
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The systematic errors which persist and have regular effects in the performance of a survey operation, are due to
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It θ is the probable error of an observed bearing of a line of length l, the error over the whole length of the traverse of n lines of length l is
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The best method of interpolation of contours, is by
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Pick up the correct specification of Ramsden eyepiece from the following :
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The conventional sign shown in below figure represents a
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Deviation of the actual road gradient from the proposed contou'r gradient up hill side, involves
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Measuring with a 30 m chain, 0.01 m too short, introduces
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Setting out a curve by two theodolite method, involves
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When the bubble of the level tube of a level, remains central
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A.
it consists of two equal piano convex lenses |
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B.
the curved surfaces of plano-convex lenses face each other |
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C.
the two lenses are separated by a distance equal to 2/3 of the focal length of either lens. |
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D.
the distance between the diaphragm and the front lens of the eyepiece is kept equal to 1/4 th of the focal length of a lens so that rays from a point on the diaphragm enter the eye as a parallel beam |
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E.
all the above. |