100. Even Carnot engine CANNOT give 100% efficiency, because we CANNOT

1.	100. Even Carnot engine CANNOT give 100% efficiency, because we CANNOT(A) ellminate friction(B) prevent radiation(C) reach absolute zero temperature (D) find ideal sources
Answer» find ideal sources D find ideal sources Efficiency of a carnot engine is given by η = 1 - Q2/Q1 In order to achieve 100% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work. The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity. This would be violation of second law of thermodynamics. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature. The correct option is C.

100. Even Carnot engine CANNOT give 100% efficiency, because we CANNOT(A) ellminate friction(B) prevent radiation(C) reach absolute zero temperature (D) find ideal sources

Answer»

find ideal sources

D find ideal sources

Efficiency of a carnot engine is given by

η = 1 - Q2/Q1

In order to achieve 100% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work.

The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity. This would be violation of second law of thermodynamics. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature.

The correct option is C.

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