INDIABIX - TNP_Surveying Section 2 (indiabix)
If the sight distance (S) is equal to the length of the vertical-curve (2l) joining two grades g1% and - g2%, the height of the apex will be
(g1-g2)/400
A tape of length l and weight W kg/m is suspended at its ends with a pull of P kg, the sag correction is
(l^3)(W^2)/24P^2
A dumpy level was set up at the midpoint between two pegs A and B, 50 m apart and the staff readings at A and B were 1.22 and 1.06. With the level set up a A, the readings at A and B were 1.55 and 1.37. The collimation error per 100 m length of sight is
0.04 m inclined downwards
Probable systematic error in precise levelling as recommended by International Geodetic Association should not exceed(where k is in kilometers.)
0.2 √k mm.
A dumpy level is set up with its eye-piece vertically over a peg A. The height from the top of peg A to the centre of the eye-piece is 1.540 m and the reading on peg B is 0.705 m. The level is then setup over B. The height of the eye-piece above peg B is 1.490 m and a reading on A is 2.195 m. The difference in level between A and B is
0.770 m
The desired sensitivity of a bubble tube with 2 mm divisions is 30". The radius of the bubble tube should be
13.75 m
If the rate of gain of radial acceleration is 0.3 m per sec3 and full centrifugal ratio is developed. On the curve the ratio of the length of the transition curve of same radius on road and railway, is
2.828
Metric chains are generally available in
20 m and 30 m length
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
200 sq. km of area
For a curve of radius 100 m and normal chord 10 m, the Rankine's deflection angle, is
2°51'.53.
The angle between two plane mirrors of optical square is
45
Keeping the instrument height as 1 and 1/2 m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less than
45 cm
Pantagraph is used for
Enlarging or reducing plans
If the angular measurements of a traverse are more precise than its linear measurements, balancing of the traverse, is done by
Transit rule
Geodetic surveying is undertaken
all of the above
The branch of surveying in which both horizontal and vertical positions of a point, are determined by making instrumental observation, is known
all of the above
A back sight
all the above
In optical reading instruments
all the above
The area of a plane triangle ABC, having its base AC and perpendicular height h, is
all the above
Pick up the correct specification of Ramsden eyepiece from the following :
all the above.
Pick up the correct statement from the following :
all the above.
Setting out a curve by two theodolite method, involves
angular measurements only
The operation of making the algebraic sum of latitudes and departures of a closed traverse, each equal to zero, is known
balancing the traverse
A relatively fixed point of known elevation above datum, is called
bench mark
In leveling operation
both a and b
The conventional sign shown in below figure represents a
bridge carrying railway below road
An ideal transition curve is
clothoid spiral
The best method of interpolation of contours, is by
computation
True meridian of different places
converge from the equator to the poles
The latitude of a traverse leg is obtained by multiplying its length by
cosine of its reduced bearing
A uniform slope was measured by the method of stepping. If the difference in level between two points in 1.8m and the slope distance between them is 15m the error is approximately equal to
cumuulatie, ±0.11 m
In levelling operation
d. both (b) and (c)
The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known
dip
Deviation of the actual road gradient from the proposed contou'r gradient up hill side, involves
excavation on the centre line
The systematic errors which persist and have regular effects in the performance of a survey operation, are due to
faulty instrument
Orientation of a plane table by solving two point problem is only adopted when
given points are inaccessible
The diaphragm of a stadia theodolite is fitted with two additional
horizontal hairs
Cross hairs in surveying telescopes, are fitted
in front of the eye piece
Plotting of inaccessible points on a plane table, is done by
intersection
When the bubble of the level tube of a level, remains central
line of sight is horizontal
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
l√n
If the area calculated form the plan plotted with measurements by an erroneous chain, accurate area of the plan is
measured area x (NL of chain/length of chain used)^2
For setting out a simple curve, using two theodolites
none of these
wo hill tops A and B 20 km apart are intervened by a third top C. If the top most contour of the three hill tops are of the same value, state whether the line of sight AB
passes below the hill top C
Measuring with a 30 m chain, 0.01 m too short, introduces
positive cumulative error
On a diagonal scale, it is possible to read up to
three dimensions
Centering error of a theodolite produces an error
which varies with the direction of pointing and inversely with the length of sight
Let angular value of one graduation of a tube is length x be φ seconds and R be the raiud of its internal curved surface, then
φ= (x)/(206265)R
