Q. The thermal stress is a function of _____________

P. Coefficient of linear expansion
Q. Modulus of elasticity
R. Temperature rise

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Q. A steel rod is heated from 25 to 250 degree celcius. Its coefficient of thermal expansion is 10⁻⁵ and E = 100 GN/m². if the rod is free to expand, the thermal stress developed in it is:

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Q. Which one of the following pairs is NOT correctly matched?

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Q. A steel rod of length L and diameter D, fixed at both ends, is uniformly heated to a temperature rise of δT. The Youngs modulus is E and the coefficient of linear expansion is unity. The thermal stress in the rod is ____________

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Q. A uniform, slender cylindrical rod is made of a homogeneous and isotropic material. The rod rests on a frictionless surface. The rod is heated uniformly. If the radial and longitudinal thermal stress are represented by σx and σz, then ___________

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Q. Which one of the following are true for the thermal expansion coefficient?

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Q. The length, coefficient of thermal expansion and Youngs modulus of bar A are twice of bar B. If the temperature of both bars is increased by the same amount while preventing any expansion, then the ratio of stress developed in bar A to that in bar B will be ___________

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Q. Which test is conducted to measure the ability of a material to resist scratching, abrasion, deformation and indentation?

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Q. Which test is conducted to measure the endurance limit of the material?

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Q. What is the process in which the metal is cooled rapidly in water after heating the metal above the lower critical temperature to increase the hardness of the material?

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Q. What is the process of heating the metal in the furnance to a temperature slightly above the upper critical temperature and cooling slowly In the furnance.

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Q. Photo stress method is ___________

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Q. What is the factor of safety?

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Q. Which one of the following has the largest value of thermal coefficient?

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Q. Identify which factor may cause a lowered body temperature:

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Q. If a bar of two different length are in a line and P load is acting axially on them then what will be the change in length of the bar if the radius of both different lengths is same?

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Q. If a bar of two sections of different diameters of same length are in a line and P load is acting axially on them then what will be the change in length of the bar?

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Q. Does the value of stress in each section of a composite bar is constant or not?

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Q. A composite bar of two sections of equal length and equal diameter is under an axial pull of 10kN. What will be the stresses in the two sections?

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Q. A composite bar of two sections of unequal length and equal diameter is under an axial pull of 10kN. What will be the stresses in the two sections?

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