Description and figure for questions 24 and 25: Shown at right are the energy tr

Question

Description and figure for questions 24 and 25: Shown at right are the energy transfer diagram for one cycle of a proposed heat engine that uses an ideal gas. (Sec the description and figure at the top of the page.) What is the efficiency of the proposed heat engine? 20% 30% 40% 50% 60% (See the description and figure at the top of the page.) Which of the following (if any) does the proposed heat engine violate? first law of thermodynamics second law of thermodynamics both (A) and (B) none of the above

Explanation / Answer

Here ,

24)

efficiency = W/Qin

efficiency = 4/10

efficiency = 0.40 = 40 %

option C)

25)

for the maximum effeciencey

u = 1 - T2/T1

u = 1 - 600/300 = 0.50

hence , it does violate any of the laws

correct answer is D)

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