Whenever there is some increase or decrease in the temperature of a body, it causes the body to expand or contract. A little consideration will show that if the body is allowed to expand or contract freely, with the rise or fall of the temperature, no stresses are induced in the body. But, if the deformation of the body is prevented, some stresses are induced in the body. Such stresses are known as thermal stresses or temperature stresses and the corresponding strains are called thermal strains or temperature strains.
since the body is free to expand no stresses are induced in the body.
6) A steel bar of 6mm is heated from 25 degree Centigrade to 60 degree centigrade and it is free to expand. The bar will induce
Answer is:
no stress
Explanation:
Related ISRO Technician-B Fitter Question Paper - 2016 (Set - 3) with Answer Key
Answer is:
linear
Explanation:
A Newtonian fluid is one where there is a linear relationship between stress and strain-rate. The ratio of stress to strain-rate is the Viscosity of the fluid. A fluid where there is no linear relationship between stress and strain-rate is called a Non-Newtonian fluid.
Answer is:
medium head application from 24 to 180 mm
Explanation:
Francis turbine is best suited for medium head application from 24 to 180 m.
Answer is:
Ductility
Explanation:
Tempering of quenched martensite steel is necessary to improve Ductility
Answer is:
Electron Beam
Explanation:
Electron Beam welding techniques require a vacuum environment.
Electron Beam Welding is a welding process utilizing a heat generated by a beam of high energy electrons. The electrons strike the work piece and their kinetic energy converts into thermal energy heating the metal so that the edges of work piece are fused and joined together forming a weld after Solidification. Electron Beam Welding is performed under vacuum conditions to prevent dissipation of the electron beam.
