1. During a polytropic process, 10 lb of an ideal gas, whose R=40 ft.lb/lb.R and c = 0.25 Btu/lb.R, changes state from 20 psia and 40°F to 120 psia and 340°F. Determine (a) n, (b) AU and AH, (c) AS, (d) Q, (e) SpdV, (f)-SVdp. (g) If the process is steady flow during which AK = 0, what is W?. What is AK if W, = 0? (h) What is the work for a nonflow process?

Calculate the energy requirement to raise the temperature of 1 kg of water from 60 ° C of water to 90 ° C using the following approach;   a. Average specific heat usage (Tab A Singh's Book. 4.1) = kJ b. The enthalpy change in the water - vapor saturation table (Tab A Singh's Book. 4.2) = kJ

An oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergo a reversible non flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C. From the above statement: What is the initial temperature ? * 786.76°K 797.10 °K 876.50°K 796.77 °K Other: Determine the constant volume specific heat. * 0.6580 KJ/Kg-°K 0.6568 KJ/Kg-°K 0.5897 KJ/Kg- K 0.6577 KJ/Kg-°K

2. An ideal gas in a piston/cylinder system undergoes a process in which the specific volume is increased. In which process is the most work done for the same volume change? a. Isobaric process b. Isothermal process C. Isentropic process, k = 1.4 d. Polytropic process, n = 2 e. Cannot tell from this information