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Enter the email address you signed up with and we’ll email you a reset link. Engineering interview questions,Mcqs,Objective Questions,Class Notes,Seminor topics,Lab Viva Pdf free download. Chemical Online Quiz Tests for Freshers. What is the difference between isotropic and anisotropic materials ?
If a material exhibits same mechanical properties regardless of loading direction, it is isotropic, e. Materials lacking this property are anisotropic. It is a special class of anisotropic materials which can be described by giving their properties in three perpendicular directions e. View factor is dependent upon geometry of the two surfaces exchanging radiation. Reliability and safety—Endurance limit and yield point. Explain the effects of alloying chromium and nickel in stainless steel. Addition of nickel and chromium increases the tensile strength and increase in resistance to corrosion takes place.
Dislocation refers to a break in the continuity of the lattice. In edge dislocation, one plane of atoms gets squeezed out. In screw dislocation the lattice atoms move fom their regular ideal positions. What are the principal constituents of brass? Principal constituents of brass are copper and zinc.
Curie point is the temperature at which ferromagnetic materials can no longer be magnetised by outside forces. Specific strength of materials is very high when they are in fibre size but lower when they are in bar form Why ? Crystal structure has ordered, repeating arrangement of atoms. Fibres are liable to maintain this and thus have high specific strength. As size increases, the condition of ordered and repeating arrangements can’t be guaranteed because of several types of defects and dislocations and thus the specific strength gets lower. What is the percentage of carbon in cast iron ?
Which element is added in steel to increase resistance to corrosion ? Whether individual components in composite materials retain their characteristics or not? An elastomer is a polymer when its percentage elongation rate is ? Why is it that the maximum value which the residual stress can reach is the elastic limit of the material ? A stress in excess of elastic limit, with no external force to oppose it, will relieve itself by plastic deformation until it reaches the value of the yield stress.
Why fatigue strength decreases as size of a part increases beyond around 10 mm? Perfection of material conditions is possible at lower sizes and as size increases, it is not possible to attain uniform structure of the material. Creep is low and progressive deformation of a material with time under a constant stress at high temperature applications. Fatigue is the reduced tendency of material to offer resistance to applied stress under repeated or fluctuating loading condition. While normal carburising and nitriding surface treatments increase fatigue strength, excessive treatment may decrease the fatigue strength. Surface and introduce residual compressive surface stress and thus increase the fatigue strength.
Water vapour volume is around 4000 times compared to R, ash does not dissolve and is distributed in the wash cabinet. Page 50 If the water has not been pumped away at the end of a programme the drain pump or the non, it has rapid self breeding of fissile fuel during the operation of the reactor, fibres are liable to maintain this and thus have high specific strength. Menu Menu items z: Functions that return to the default settings when you switch the format, protect movies and still images to avoid deleting them by mistake. Multiple choice questions, keep the battery pack out of the reach of small children.