Question 41 : What is added to the moist air in the combustion process?
1. Water
2. Carbon dioxide
3. Oxygen
4. None of the mentioned
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Question 42 : In condensation, moist air is cooled below its which temperature?
1. Dew-point temperature
2. Dry-bulb temperature
3. Wet-bulb temperature
4. Saturation temperature
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Question 43 : What is the work of the humidification process?
1. Vaporization
2. Freezing
3. Condensing
4. None of the mentioned
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Question 44 : What is the work of drying process?
1. Decreases the moisture content
2. Vaporizes water
3. Increases the moisture content
4. None of the mentioned
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Question 45 : What is the enthalpy change of 30^oC system if the heat capacity of air at 38^oC is 5 J/^oC and heat capacity of water vapor at 38^oC is 10 J/^oC, enthalpy of vaporization is 10 J, and the humidity is 60%?
1. 14 J
2. 39 J
3. 65 J
4. 94 J
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Question 46 : What is the enthalpy change of 20^oC system if the heat capacity of air at 25^oC is 5 J/^oC and heat capacity of water vapor at 25^oC is 10 J/^oC, enthalpy of vaporization is 10 J, and the humidity is 20%?
1. 25 J
2. 37 J
3. 44 J
4. 51 J
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Question 47 : What is the enthalpy change of 10^oC system if the heat capacity of air at 20^oC is 5 J/^oC and heat capacity of water vapor at 20^oC is 15 J/^oC, enthalpy of vaporization is 10 J, and the humidity is 40%?
1. 58 J
2. 84 J
3. 114 J
4. 135 J
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Question 48 : What is the enthalpy change of 15^oC system if the heat capacity of air at 20^oC is 10 J/^oC and heat capacity of water vapor at 20^oC is 20 J/^oC, enthalpy of vaporization is 20 J, and the humidity is 50%?
1. 50 J
2. 60 J
3. 80 J
4. 110 J
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Question 49 : What is the enthalpy change of the mixture if the enthalpy change of air is 10 J, enthalpy change of water vapor is 15 J, and the humidity is 40%?
1. 10 J
2. 12 J
3. 14 J
4. 16 J
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Question 50 : What is the temperature of the point of intersection of adiabatic cooling line and specific humid volume line?
1. Wet-bulb temperature
2. Dry-bulb temperature
3. Dew point temperature
4. None of the mentioned
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