Class: 3rd YearUniversity of BaghdadCollege of EngineeringDept. of Energy EngineeringCourse: Eng. ThermodynamicsInstructor: Dr. Jasim M. MahdiQUESTION I:Consider a piston-cylinder assembly containing a gas as shown below. The initial volumeof the gas is 0.03 m', the initial pressure is 1 bar, and the cross-sectional area of the piston is 0.1m2. Initially, the linear spring touches the piston but exerts no force on it. The final volume is 0.05m', and the final pressure is 2 bar. Determine:(a) The value of the spring constant in kN/m.(b) The total work done by the gas in kJ.GasHeatQUESTION II:A thermodynamic system undergoes a cycle A-B-C-A as shown in the p-Vdiagram. Complete the table below by filing in either + or - for the sign of each thermodynamicquantity associated with each process. You might put '0' ifyou think that the quantity remains unchanged.4030QW AE20AB101,0 2.0 3.04.0Volume (m)Pressure (Pa)

Consider a piston-cylinder assembly containing a gas as shown below. The initial volume f the gas is 0.03 m, the initial pressure is 1 bar, and the cross-sectional area of the piston is 0.1 n². Initially, the linear spring touches the piston but exerts no force on it. The final volume is 0.05 n², and the final pressure is 2 bar. Determine: a) The value of the spring constant in kN/m. b) The total work done by the gas in kJ.

Consider a piston-cylinder assembly containing a gas as shown below. The initial volume f the gas is 0.03 m, the initial pressure is 1 bar, and the cross-sectional area of the piston is 0.1 n². Initially, the linear spring touches the piston but exerts no force on it. The final volume is 0.05 n², and the final pressure is 2 bar. Determine: a) The value of the spring constant in kN/m. b) The total work done by the gas in kJ.

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Chapter1: Units, Trigonometry. And Vectors

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Question

Class: 3rd Year
University of Baghdad
College of Engineering
Dept. of Energy Engineering
Course: Eng. Thermodynamics
Instructor: Dr. Jasim M. Mahdi
QUESTION I:
Consider a piston-cylinder assembly containing a gas as shown below. The initial volume
of the gas is 0.03 m', the initial pressure is 1 bar, and the cross-sectional area of the piston is 0.1
m2. Initially, the linear spring touches the piston but exerts no force on it. The final volume is 0.05
m', and the final pressure is 2 bar. Determine:
(a) The value of the spring constant in kN/m.
(b) The total work done by the gas in kJ.
Gas
Heat
QUESTION II:
A thermodynamic system undergoes a cycle A-B-C-A as shown in the p-V
diagram. Complete the table below by filing in either + or - for the sign of each thermodynamic
quantity associated with each process. You might put '0' if
you think that the quantity remains unchanged.
40
30
Q
W AE
20
A
B
10
1,0 2.0 3.0
4.0
Volume (m)
Pressure (Pa)

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