試題詳解

58. The Stirling engine cycle(A →B→ C→D) consists of 4 parts as shown in the figure on the right. A→B and C →Dare isothermal expansion and compression processes, respectively, while B →C and D →A are isochoric (fixed volume) processes. Assume that the Suppose a Stirling engine contains I mole of an ideal gas. Which of the following statements is incorrect?
(A) The heat absorbed by the gas in one cycle is more than the heat released.
(B) The change of entropy of the gas after one cycle is greater than zero.
(C) The internal energy of the gas remains a constant during the segment A →B.
(D) The internal energy of the gas drops during the segment B → C.
(E) When the cycle is operated in reverse order, the environment has to do positive work to the gas.