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Questions_chapter 3

# Questions_chapter 3 - Chap3-1 IDEAL GAS Discharged(V=const...

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Chap3-1 IDEAL GAS Discharged (V=const) A rigid tank contains 7 kg of an ideal gas at 5 atm and 30 ° C. Now a valve is opened, and half of mass of the gas is allowed to escape. If the final pressure in the tank is 1.5 atm, the final temperature in the tank is (a) -91 ° C (b) °18 C (c) -182 ° C (d) 91 ° C (e) 15 ° C Answer Chap3-2 Temp Rise of AIR in Tank (V=const) The pressure in an air storage tank is measured to be 250 kPa (gage) in the morning, and 275 kPa (gage) in the afternoon as a result of solar heating. The local atmospheric pressure is 100 kPa. If the temperature of air in the tank is 15 ° C in the morning, the air temperature in the afternoon is (a) 15.9 ° C (b) 31.5 ° C (c) 38.0 ° C (d) 16.2 ° C (e) 15 ° C Answer Chap3-3 Saturated H2O mixture in Tank A 230-m 3 rigid tank is filled with saturated liquid-vapor mixture of water at 120 ° C. If 25% of the mass is liquid and the 75% of the mass is vapor, the total mass in the tank is (a) 252 kg (b) 824 kg (c) 344 kg (d) 230 kg (e) 683 kg Answer Chap3-4 Pressure Cooker Heat Transfer Rate Water is boiled at 300 kPa pressure in a pressure cooker. The cooker initially contains 3 kg of water.

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