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.
Umesh said:
5 years ago
You are right, thanks, @Ajmal Khan.
A.Ahmed said:
6 years ago
(B) is the correction option.
Correction due to pull = (Pm-P0)*L/AE.
= (40-30)*30*100/1.5*0.1*2.2*10^6.
= +0.0909.
Correction due to pull = (Pm-P0)*L/AE.
= (40-30)*30*100/1.5*0.1*2.2*10^6.
= +0.0909.
A.Ahmed said:
6 years ago
All my friends are said to correct answer is C but they did not convert the unit of 30m chain into 30*100 cm.
Bee said:
6 years ago
@Ajmal khan nope option C is correct, as pull you applied is more so the length measured will be less than true length and correction will be positive and error will be negative.
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.
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).
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.
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