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Engineering · Mechanical Engineering
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9) An ideal-gas mixture consists of 2 k a) 0.825 b) 0.750 c) 0.500 d) 0.250 mol of N2 and 6 kmol of CO2. The mass fraction of CO2 in the mixture is contains 3 kmol of N2 at 400 10) A rigid tank is divided into two compartments by a partition. One compartment co kPa and the other compartment contains 7 kmol of CO2 at 200 kPa. N two gases form a homogeneou a) 250 kPa b) 125 kPa c) 75 kPa d) 25 kPa in the mixture is s mixture at 250 kPa. The partial pressure of N2 in the mixture is r at25 oC and 1 atm has ma-2 kg and m-0.01 kg. What is its specific humidity? a) 200 kg water vapor/kg dry air b) 0.005 kg water vapor/kg dry ain c) 0.02 kg water vapor/kg dry air 2.01 kg water vapor/kg dry air d) 12) What is relative humidity? a) Ratio of the amount of moisture the air holds to the maximum amount of moisture the air can hold at the same temperature b) The mass of water vapor present in a unit mass of dry air. c) The mass of the dry air in atmospheric air. d) None. 13) Which of the following is correct for 50% excess air? a) Equals to 50% theoretical air. b) Equals to 150% theoretical air. c) d) Equals to stoichiometric amount of air Equals to 50% deficiency of air 14) Which of the following is not a reason for incomplete combustion? a) Excess air b) Insufficient oxygen. c) Insufficient mixing d) Limited time for fuel and oxygen mixture a) It is the heating value when H20 in the products are in vapor form. b) It is the enthalpy value of the water in the fuel c) It is the enthalpy value of the exhaust gasses d) It is the heating value when H2O in the products are in liquid form 15) Which of the following is correct for the higher heating value?

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