西交《工程热力学》在线作业（国外英文资料）.docVIP

西交《工程热力学》在线作业（国外英文资料） Engineering thermodynamics online Exam time: 100 test time: Single topic selection Multiple choice (35 questions, 70 points.) The equilibrium state is when there is no external influence (). A. the state of the system both inside and outside the system remains constant B. the internal changes are smaller The internal and external parameters of the system do not change over time D. the internal state of the system does not change Full marks: 2 After an irreversible adiabatic process, the entropy changes delta S12 (). A. greater than zero B. equal to zero C. less than zero D. indefinite Full marks: 2 The relative humidity of saturated wet air () A. phi 1 B. phi = 1 C. phi 1 D. 0 phi 1 Full marks: 2 In the process of irreversible change, the system is in 20kJ, and the system is changed to 20kJ. A. increase B. to reduce C. the same Not sure Full marks: 2 The closed line energy equation is () A. Q plus delta U plus W is equal to 0 B. Q + delta U - W = 0 C. Q-delta U plus W is equal to 0 D. q-minus delta U minus W is equal to 0 Full marks: 2 The equation PVK = const for the adiabatic process (k = cp/CV) applies to () A. ideal gas adiabatic process The ideal gas is a reversible adiabatic process C. Ideal gas constant heat capacity reversible adiabatic process D. Any gas constant heat capacity reversible adiabatic process Full marks: 2 For any process, such as the entropy of the system is equal to zero, then () The process is A reversible process The process is irreversible C. cant determine whether its invertible Full marks: 2 The reduced pressure in the quasi-equilibrium process of the simple compressible heat system (). A. the technical work is positive B. the technical work is negative C. Volume work is positive D. the volume work is negative Full marks: 2 In a quasi-static process, all the states that pass through the system are close to (). A. initial state Environmental status proximity D. the equilibrium state Full marks: 2 The inpossibili