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 1 of 3.
Jay ghosh said:
10 years ago
Applied pull 40 kg and standardized pull 30 kg. So value of correction is +0.000909 m and answer is (C).
Ajay said:
9 years ago
Correction = (P-p) * L/A * E
=> (40-30) * 30/15 * 2.2 * 10^6.
=> (40-30) * 30/15 * 2.2 * 10^6.
Satish said:
9 years ago
But in my point of view c option is correct because pm >po then correction is positive.
Can anyone agree with me?
Can anyone agree with me?
Ajmal Khan said:
9 years ago
No, @Satish the answer A is correct because the standard pull is 30 Kg and applied pull is 40 Kg, so the tape will measure long distance than actual, so the final result must be subtracted from measured distance. That's why it is negative one.
(1)
RK said:
9 years ago
I agree with @Satish as the length of the tape is more so measures length will less so correction will be less.
Apcivil@n said:
9 years ago
It should be C as P is greater than Po +ve is the answer.
B N YADAV said:
9 years ago
(Pm-Po)L/AE.
If Pm is greater than Po, the correction will be positive ie. +0.000909 m.
If Pm is greater than Po, the correction will be positive ie. +0.000909 m.
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.
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.
Aamir said:
8 years ago
It's C. I agree.
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