Which of the following instruments is generally used for base line measurements?
Invar tapes are used for linear measurement of very high degree precision such as base line measurements cloth or lines tap for rough and subsidiary measurements such as offset.
Which of the following is an obstacle to chaining but not to ranging?
Which of the following methods of offsets involves less measurement on the ground?
The permissible error in chaining for measurement with chain on rough or hilly ground is
The correction for sag is
(Assuming parabola curve),
l1 = length suspended (m)
p = pud applied (kg or N)
w = weight of tape per meter length
wl1 = weight of tape suspended between supports
The maximum tolerance in a 20 m chain is
The maximum tolerance in 20 m chain is ±5 mm in 30 m chain is ±8 mm
The correction to be applied to each 30 metre chain length along θ° slope, is
A 30 m metric chain is found to be 0.1 m too short throughout the measurement. If the distance measured is recorded as 300 m, then the actual distance measured will be
Actual length of chain = 30 - 0.1 = 29.9 m
The length of a chain is measured from
A surveyor measured the distance between two points on the plan drawn to a scale of 1 cm = 40 m and the result was 468 m. Later he discovered that he used a scale of 1 cm = 20 m. What is the true distance between the two points?
Distance between two points measured with scale of 1 cm to 20 cm
= 468/20 = 23.4 cm
Actual scale of the plan is 1 cm = 40 m
∴ True distance between points
= 23.4 x 40 = 936 m