Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 6 (Q.No. 12)
12.
A steel bar of 2 m length is fixed at both ends at 20°C. The coefficient of thermal expansion is 11 x 10-6/°C and the modulus of the elasticity is 2 x 106 kg/cm2. If the temperature is changed to 18°C, then the bar will be experience a stress of
Discussion:
16 comments Page 1 of 2.
Abhishek Thakur said:
4 years ago
Stress on 20°C = 440kg/cm^2,
Stress on18°/C = 396kg/cm^2,
Stress on18°< stress on 20°C.
Therefore compression will occurs,
Due to decrease in temperature.
Stress on18°/C = 396kg/cm^2,
Stress on18°< stress on 20°C.
Therefore compression will occurs,
Due to decrease in temperature.
Roy said:
8 years ago
When temperature increases thermal stress induced in steel rod is compressive and when temp decreases it is tensile in nature. So option D is the correct answer.
Lov said:
7 years ago
It is fixed from both ends so elongation will not take place.
Hence, 11x10^-6 x 2x10^6 x 20 = 44 kg /cm^2 compreesive is the right answer.
Hence, 11x10^-6 x 2x10^6 x 20 = 44 kg /cm^2 compreesive is the right answer.
Rahul verma said:
2 years ago
Option D is correct.
Compression in the free bar but, due to fixed conditions it will experience opposite stress which is tensile.
Compression in the free bar but, due to fixed conditions it will experience opposite stress which is tensile.
(1)
Himanshu said:
7 years ago
During an increase in temperature steel try to expand or decrease in temp steel will contract. So, the correct is option C.
Gurmeet Kaur said:
4 years ago
Fall in temp =tension produced in martial.
Temp trying to compress the material but material try to expand.
Temp trying to compress the material but material try to expand.
Neelesh said:
6 years ago
Since temp fall from 20 to 18.
So fall in temp = compression.
So, Answer C is right.
So fall in temp = compression.
So, Answer C is right.
(1)
Pavan said:
6 years ago
There is no mention as temperature Increases. There is mention as changed.
Hariram said:
8 years ago
According to me, there is no chance of being compressive.
Vicky vikrant said:
9 years ago
I think 44 kg/cm^2 tensile is the right answer.
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