2nd Midterm Review Questions

# 2nd Midterm Review Questions - Mech Eng 2W04 Winter 2014...

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Mech. Eng. 2W04, Winter 2014, Page 1 of 2 A B 2nd Midterm Some Review Questions 1. The table shown below represents a perfect gas cycle consists of five processes. The cycle starts at 100 kPa and 300 K. Complete the table and draw the cycle on a p-v diagram. Determine the cycle thermal efficiency and compare with the maximum thermal efficiency that can be achieved. For the gas ( R = 0.3 kJ/kg.K, k = 1.4) process 1-2 2-3 3-4 4-5 5-1 ∆p [kPa] 900 0.0 ∆v [m 3 /kg] -0.8 0.0 0.1 0.0 ∆T [K] 0.0 0.0 ∆u [kJ/kg] w [kJ/kg] q [kJ/kg] 2. Tank A shown in Figure has a volume of 0.4 m 3 and contains air at 250 kPa and 30 o C. Cylinder B contains a frictionless piston of a mass such that a pressure of 150 kPa inside the cylinder is required to raise the piston. The valve connecting A and B is now opened, allowing gas to low into the cylinder. Eventually, air reaches a uniform state of 150 kPa and 30 o C throughout. Calculate the work done by air during this process. 3. Steam enters the first-stage turbine shown in Fig. at 40 bar and 500 o C with a volumetric flow

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