18) Consider the following statements in relation to composite materials. A. A composite material is a structural material created synthetically or artificially by combining two or more materials having dissimilar characteristics. B. The constituents are combi
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KPSC Water Resource Department Assistant Engineer Mechanical Question Paper 2017 with Answer Key
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Covering heater pipe with another pipe whose thermal conductivity is maller in number and 50 mm thick.
When the hypotenuse of a right-angled triangle is wrapped around the circumference of a cylinder.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature,without the aid of an external source.
Second law of thermodynamics: Second law of thermodynamics states that there is a definite limit to the amount of mechanical energy, which can be obtained from a given quantity of heat energy.
According to Claussius, this lay may be stated as ” It is impossible for a self acting machine working in a cyclic process, to transfer heat from a body at a lower temperature to a body at a higher temperature without the aid of an external agency”.
The second law of thermodynamics has also been stated by Kelvin Planck as ” It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.” According to this statement, the second law of thermodynamics is sometimes called as law of degradation of energy.