Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 4 (Q.No. 46)
46.
A standard steel tape of length 30 m and cross-section 15 x 1.0 mm was standardised at 25°C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of steel tape is 2.2 x 106 kg/cm2, the correction to be applied is
Discussion:
27 comments Page 2 of 3.
Ankit Gautam said:
6 years ago
Yes, it should be option C.
(1)
Shiv tiwari said:
6 years ago
If pull at the time of measure is more than pull at the time of standardization then correction is always positive and vice versa.
Abhilash said:
7 years ago
@All.
The correction is opposite of error so it should be negative.
The correction is opposite of error so it should be negative.
(1)
Debabrata said:
7 years ago
I think C is the right answer.
Ashwani Kumar said:
7 years ago
Standard pull 30 kg, but applied 40kg, means tape elongate.
Measureless, mean error -ive.
Correction must be +ive.
Measureless, mean error -ive.
Correction must be +ive.
SHANU said:
7 years ago
A steel tape20 m long standardized at 55oF with a pull of 10 kg was used for measuring a
baseline. Find the correction per tape length, if the temperature at the time of measurement
was 80oF and the pull exerted was 16 kg, weight of/ cubic cm of steel.
= 7.86 g, wt of the tape.
= 0.8 kg and F ; u kg/cmz- Coefficient of expansion of tape per l"F.
= 6.2x104.
baseline. Find the correction per tape length, if the temperature at the time of measurement
was 80oF and the pull exerted was 16 kg, weight of/ cubic cm of steel.
= 7.86 g, wt of the tape.
= 0.8 kg and F ; u kg/cmz- Coefficient of expansion of tape per l"F.
= 6.2x104.
Apna said:
7 years ago
The sign is also included in the formula, so C option is correct.
Aamir said:
8 years ago
It's C. I agree.
Rajesh said:
8 years ago
When pull the tape more than standard then the measurement will be less than 30m. So sure the correction to be added to measured length.
Abhishek Anand said:
9 years ago
Ans must be C.
As the applied pull is more than std pull so the length of tape increases.Hence the distance measured becomes less than actual.
Correction = +'ve if app>std pull.
Correction = - ve if app<std pull.
Cp=(P-Ps)L/AE;
P=app pull.
Ps=std pull.
As the applied pull is more than std pull so the length of tape increases.Hence the distance measured becomes less than actual.
Correction = +'ve if app>std pull.
Correction = - ve if app<std pull.
Cp=(P-Ps)L/AE;
P=app pull.
Ps=std pull.
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