WorksheetsChain Survey by Civil express
Total questions: 20
Worksheet time: 10mins
The accuracy of measurement in chain surveying, does not depend upon
length of the offset
scale of the plotting
importance of the features
general layout of the chain lines.
In chain surveying field work is limited to
linear measurements only
angular measurements only
both linear and angular measurements
All the above
Measuring with a 30 m chain, 0.01 m too short, introduces
positive compensating error
negative compensating error
positive cumulative error
negative cumulative error.
Chain surveying is well adopted for
small areas in open ground
small areas with crowded details
large areas with simple details
large areas with difficult details
Check lines (or proof lines) in Chain Surveying, are essentially required
to plot the chain lines
to plot the offsets
to indicate the accuracy of the survey work
to increase the out-turn
In chain surveying tie lines are primarily provided
to check the accuracy of the survey
to take offsets for detail survey
to avoid long offsets from chain lines
to increase the number of chain lines
Number of links per metre length of a chain are
2
5
8
10
The slope correction for a length of 30 m along a gradient of 1 in 20, is
3.75cm
0.375cm
37.5cm
2.75cm
The additional lines which are measured to show the correctness of the chain surveying are called:
Check lines
Proof lines
Tie lines
All of these
The correction to be applied to each 30 metre chain length along θ° slope, is
30 (sec θ - 1) m
30 (sin θ - 1) m
30 (cos θ - 1) m
30 (tan θ - 1) m
For taking offsets with an optical square on the right hand side of the chain line, it is held
by right hand upside down
by left hand upright
by right hand upright
by left hand up side down.
An angles of 45° with a chain line may be set out with
Optical square
Open Cross staff
French cross staff
Prism square
Greater accuracy in linear measurements, is obtained by
Tachometer
Direct chaining
Direct taping
All of these
Metric chains are generally available in
10 &20m
20& 30m
15 & 25m
30 & 50m
While measuring a chain line between two stations A and B intervened by a raised ground
vision gets obstructed
chaining gets obstructed
both vision and chaining get obstructed
All the above
Which one of the following mistakes/errors may be cumulative + or - :
Bad ranging
Bad straightening
erroneous length of chain
Sag
Accidental or compensating errors of length L are proportional to
L
√L
L^2
All of these
The distance between steps for measuring down hill to obtain better accuracy
decreases with decrease of slope
increases with increase of slope
decreases with increase of slope
decreases with decrease of weight of the chain
Cross-staff is used for
Setting out right angle
Measuring contour gradient
Levelling
None of these
Length of revenue chain
66ft
33ft
100ft
30m
