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Refrigeration and Air Conditioning Practice Test: Psychrometry
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Avg score: 0% Most missed: “What is the value of humidity ratio if pv = 0.387 bar and pa = 0.997 bar?”
Psychrometry topics include: Psychrometric terms and relations, psychrometric chart, thermodynamic wet bulb temperature, bypass factor, heating and cooling factor, partial pressure daltons law, two streams adiabatic mixing, humidification and dehumidification. Psychrometry is the study of the properties of moist air and gas-vapor mixtures. It's useful to engineers who work on heating, cooling, and ventilating buildings.  Some psychrometric properties that are relevant for determining climatic conditions include: Dry-bulb temperature Wet-bulb temperature Saturated vapor pressure Vapor... Show more
Refrigeration and Air Conditioning Practice Test: Psychrometry
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25 Questions

1. What is the value of pb if pa = 1.48 bar and pv = 1.52 bar, according to Dalton’s law of partial pressures?
2. The by-pass factor of the coil ___________ with _________ in number of rows of fins.
3. Which of the following is true, according to Dalton’s law of partial pressures?
4. Which of the following has the lowest relative humidity in the chart of outside summer design conditions?
5. A psychrometric chart is a graphical representation of various physical properties of dry air.
6. If the value of BPF for one row of the coil is one, then what is the value of BPF for 3872 similar rows?
7. The arrangement for extra-water to flow into the chamber from its top is called as ___________
8. What is the value of humidity ratio if pv = 0.387 bar and pa = 0.997 bar?
9. Mixture of dry air and water vapor is __________
10. If DBT = 30°C, WBT = 20°C and Barometer reading is 740 mm of Hg. Find out degree of saturation using steam tables.
11. If the value of BPF for one row of the coil is 0.4, then what is the value of BPF for 12 similar rows?
12. What is the ratio of actual mass of water vapor in a unit mass of dry air to the mass of water vapor in the same mass of dry air when it is saturated at the same temperature?
13. What is the value of sensible heat given out by the coil, if U = 198 W/m2 K, Ac = 11 m2 and tm = 0°C?
14. What is the humidity ratio in terms of mass?
15. What is the value of m1 / m2 if h1 = 81 kJ/ kg of dry air, h2 = 46 kJ/ kg of dry air and h3 = 58 kJ/ kg of dry air?
16. What is the temperature of air recorded by thermometer when it is not affected by the moisture present in it?
17. What is the temperature at which air can be brought to saturation state adiabatically?
18. What is represented by inclined straight lines but non-uniformly spaced on the psychrometric chart?
19. What is the temperature of air recorded by a thermometer, when the moisture present in it starts condensing?
20. What is represented by obliquely inclined straight lines but uniformly spaced on the psychrometric chart?
21. What is the alternate name for thermodynamic wet-bulb temperature?
22. Air being passed by not being in contact with the coil known to be measured as BPF.
23. What is the formula for m1 / m2 in terms of enthalpies for adiabatic mixing of two streams?
24. What is the efficiency of the coil?
25. Which of the following is true about the effect of velocity on the by-pass factor?