The engine is supposed to work between 727 degree C and 227 degree C, then maximum possible efficiency is
Correct answer: A. 1/2
- A. 1/2
- B. 1/4
- C. 3/4
- D. 1
Explanation
Option A is correct since the formula of efficiency for a heat engine is 1-(T2/T1). So if the temperature of the heat source (T1) is 727 degrees celsius = 1000K and that of the heat sink (T2) is 227 degrees celsius = 500K. Therefore 1- (500/1000) = ½. Option B is incorrect since it states ¼ which is not the correct answer Option C is incorrect since it states ¾ which is not the correct answer Option D is correct since it states 1 which is not correct.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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