1. A rigid tank whose volume is 10 liters is initially evacuated. A pinhole develops in the wall, and air from the surroundings at 1 bar, 25C enters the pressure in the tank becomes 1 bar. No significant heat transfer beween the contents of the tank and the surroundings occur. Assuming the ideal gas model with y 1.4 for the air, determine: (a) final temperature in the tank (b) amount of air that leaks into the tank

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The figure shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well insulated and the pressure is very nearly 1 atm throughout.  The volumetric flow rate entering at state 2 is AV2 = 4000 ft3/min.  Assume the ideal gas model for air with cp = 0.24 Btu/lb·oR and ignore kinetic and potential energy effects.  Determine the temperature of the air at the exit, in oF, and the rate of entropy production within the ducts, in Btu/min·oR.

4. Choose the correct statement/s with respect to entropy change during a process a. Entropy increases with increase in pressure at constant temperatureb. Entropy increases with increase in temperature at constant pressurec. Entropy can be kept constant by systematically increase both pressure and temperatured. Entropy can not be changed