If a hollow steel tube is heated from a temperature of 25‚Äö√Ñ√∂‚àö√ë‚àö¬•C to 250‚Äö√Ñ√∂‚àö√ë‚àö¬•C then fid the expansion of tube if area of the cross section is 300mm¬¨¬®‚Äö√¢¬ß,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10‚Äö√Ñ√∂‚àö√ñ¬¨‚Ñ¢‚Äö√Ñ√∂‚àö√ñ‚Äö√†√á per ‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ªC.$#

If a hollow steel tube is heated from a temperature of 25‚Äö√Ñ�

1.	If a hollow steel tube is heated from a temperature of 25‚Äö√Ñ√∂‚àö√ë‚àö¬•C to 250‚Äö√Ñ√∂‚àö√ë‚àö¬•C then fid the expansion of tube if area of the cross section is 300mm¬¨¬®‚Äö√¢¬ß,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10‚Äö√Ñ√∂‚àö√ñ¬¨‚Ñ¢‚Äö√Ñ√∂‚àö√ñ‚Äö√†√á per ‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ªC.$#
A.	1.22mm
B.	0.486mm
C.	0.878mm
D.	1.52mm
Answer» C. 0.878mm

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If a hollow steel tube is heated from a temperature of 25’C to 250’C then fid the expansion of tube if area of the cross section is 300mm²,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10⁻⁶ per ⁰C.
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A_CURVED_BEAM_WITH_ECCENTRICITY_0.02D_IS_LOADED_WITH_1KN.CENTROIDAL_RADIUS=4D_AND_INNER_AND_OUTER_RADII_ARE_3.5D_AND_4.5D_RESPECTIVELY._AREA_OF_CROSS_SECTION_IS_0.8D¬¨¬®‚ÄÖ√¢¬ß._FIND_THE_DIMENSION_D_IF_ALLOWABLE_STRESS_IS_110N/MM¬¨¬®‚ÄÖ√¢¬ß_AND_CONSIDERING_ONLY_DIRECT_TENSILE_STRESS.?$#
If a hollow steel tube is heated from a temperature of 25‚Äö√Ñ√∂‚àö√ë‚àö¬•C to 250‚Äö√Ñ√∂‚àö√ë‚àö¬•C then fid the expansion of tube if area of the cross section is 300mm¬¨¬®‚Äö√¢¬ß,length of tube=200mm and coefficient of thermal expansion is 10.8 x 10‚Äö√Ñ√∂‚àö√ñ¬¨‚Ñ¢‚Äö√Ñ√∂‚àö√ñ‚Äö√†√á per ‚Äö√Ñ√∂‚àö√ñ‚Äö√†√ªC.$#
A_curved_beam_with_eccentricity_0.02D_is_loaded_with_1kN.Centroidal_radius=4D_and_inner_and_outer_radii_are_3.5D_and_4.5D_respectively._Area_of_cross_section_is_0.8D¬¨¬®‚Äö√¢¬ß._Find_the_dimension_D_if_allowable_stress_is_110N/mm¬¨¬®‚Äö√¢¬ß_and_considering_combined_effect_of_direct_stress_and_bending_stress.$#
Residual stresses are always added in the load stresses and hence are always harmful.
All type of stresses vanishes after as soon as the applied load is removed.

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