if a steam engine has an inlet of 280 degrees C and an outlet of 28 degrees C, and the efficiency of this engine is 55%, calculate the heat discarded by the engine if the entropy change of the system during isothermal expansion is 840JK^-1.

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Q: Is perfect heat engine and perfect refrigerator exist in term of entropy

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A: Given Data, p=3 bar, T1=27°CT2=57°C, To=280 K

Q: revolving Ive y, then

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Q: For Carnot Cycle: Thermal efficiency= 1

A: Draw the T-s diagram of the Carnot cycle.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.