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The Carnot cycle is impracticable because : (a) Isothermal process is very fast; and isentropic process is very slow (b) Isothermal process is very slowp; and isentropic process is very fast (c) Isothermal process and isentropic process are both very slow (d) Isothermal process and isentropic process are both very fast |
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Answer» (b) Isothermal process is very slowp; and isentropic process is very fast The Carnot cycle cannot be performed in practice because of the following reasons : 1. It is impossible to perform a frictionless process. 2. It is impossible to transfer the heat without temperature potential. 3. Isothermal process can be achieved only if the piston moves very slowly to allow heat transfer so that the temperature remains constant. Adiabatic process can be achieved only if the piston moves as fast as possible so that the heat transfer is negligible due to very short time available. The isothermal and adiabatic processes take place during the same stroke therefore the piston has to move very slowly for part of the stroke and it has to move very fast during remaining stroke. This variation of motion of the piston during the same stroke is not possible. |
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