Question

BME 3143 ENGINEERING THERMODYNAMICS AND HEAT TRANSFER Instruction: Choose any Three (3) questions and answer in the booklet provided. 1. What is the Relationship between Enthalpy and Entropy of a Closed System (CLO 1) (20 marks) 2. Three moles of an ideal monoatomic gas have an initial pressure $P_1 = 3$ atm and an initial volume $V_1 = 3$ L. The gas is taken through the following quasi-static cycle: • It is expanded isothermally until it has a volume $V_2 = 6$ L. • It is then heated at constant volume until it has a pressure $P_3 = 3$ atm • It is then cooled at constant pressure until it is back to its initial state. (CLO 1) a) Show this cycle on a PV diagram, (6 marks) b) Find the temperatures $T_1, T_2, T_3$. (6 marks) c) Calculate the heat added and the work done by the gas during each part of the cycle. (8 marks)

          BME 3143 ENGINEERING THERMODYNAMICS AND HEAT TRANSFER
Instruction: Choose any Three (3) questions and answer in the booklet provided.
1. What is the Relationship between Enthalpy and Entropy of a Closed System (CLO 1)
(20 marks)
2. Three moles of an ideal monoatomic gas have an initial pressure $P_1 = 3$ atm and an initial
volume $V_1 = 3$ L. The gas is taken through the following quasi-static cycle:
• It is expanded isothermally until it has a volume $V_2 = 6$ L.
• It is then heated at constant volume until it has a pressure $P_3 = 3$ atm
• It is then cooled at constant pressure until it is back to its initial state. (CLO 1)
a) Show this cycle on a PV diagram,
(6 marks)
b) Find the temperatures $T_1, T_2, T_3$.
(6 marks)
c) Calculate the heat added and the work done by the gas during each
part of the cycle.
(8 marks)

BME 3143 ENGINEERING THERMODYNAMICS AND HEAT TRANSFER
Instruction: Choose any Three (3) questions and answer in the booklet provided.
1. What is the Relationship between Enthalpy and Entropy of a Closed System (CLO 1)
(20 marks)
2. Three moles of an ideal monoatomic gas have an initial pressure P1 = 3 atm and an initial
volume V1 = 3 L. The gas is taken through the following quasi-static cycle:
• It is expanded isothermally until it has a volume V2 = 6 L.
• It is then heated at constant volume until it has a pressure P3 = 3 atm
• It is then cooled at constant pressure until it is back to its initial state. (CLO 1)
a) Show this cycle on a PV diagram,
(6 marks)
b) Find the temperatures T1, T2, T3.
(6 marks)
c) Calculate the heat added and the work done by the gas during each
part of the cycle.
(8 marks)

Added by Jeffrey S.

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