Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 1 (Q.No. 38)
38.
Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to
Discussion:
22 comments Page 1 of 3.
Anvesh said:
1 decade ago
How it will come?
Subhajit said:
1 decade ago
s*r/(40*1.414).
= (20*40)/56.56.
= 14.14 answer.
= (20*40)/56.56.
= 14.14 answer.
Rajesh said:
10 years ago
Mention the formula clearly to calculate.
Ganpati Patel said:
10 years ago
L = s*r*error/1.414.
= 20*40*0.05/1.414 = 28.28 m.
= 20*40*0.05/1.414 = 28.28 m.
Darshika said:
10 years ago
L = 0.05*s*r/1.414 = 28.28 m.
Ihab said:
10 years ago
Why 1.414?
Abhay said:
10 years ago
The center-to-center dimension for a 45-degree bend is equal to the desired size of the offset times the cosecant 1.414.
A cosecant is used to determine the distance between the centers of the two bends used to make an offset. A 45-degree angle has a cosecant of 1.414.
A cosecant is used to determine the distance between the centers of the two bends used to make an offset. A 45-degree angle has a cosecant of 1.414.
Satish said:
9 years ago
Due to angular & linear sin45 = 0.7 then it is 1.414.
Akhilesh yadav said:
9 years ago
The displacement due to angular error =Lsin.
and it should be equal to displacement due to Linear error = L/r.
Corresponding displacement on paper=√2(L/r)(1/S)= √2(Lsin-/S).
Corresponding if a limit of accuracy in plotting is 0.05cm then,
√2(L/r)(1/S)=.05,
L= (.05x40x20)/√2.
= 28.28.
Where S=1 in accuracy.
r=1 in scale.
and it should be equal to displacement due to Linear error = L/r.
Corresponding displacement on paper=√2(L/r)(1/S)= √2(Lsin-/S).
Corresponding if a limit of accuracy in plotting is 0.05cm then,
√2(L/r)(1/S)=.05,
L= (.05x40x20)/√2.
= 28.28.
Where S=1 in accuracy.
r=1 in scale.
Naga raju Gowd said:
9 years ago
How answer is 28.28?
I am not getting this. Please explain me.
I am not getting this. Please explain me.
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