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GATE 2019: Thermodynamics Quiz 8
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Question 1
Moist air at 1.013 bar and 30 °C contains 10 gm of water vapour per kg of dry air. Assuming that air and water vapour mixture to behave as an ideal gas and saturation pressure of water vapour at 30 °C is 4.167 kPa relative humidity of air will be
Question 2
Air at 20 °C dry bulb temperature and 40% relative humidity is heated up to 40 °C using heater, whose surface temperature is maintained uniformly at 45 °C. The bypass factor of the heater is
Question 3
Various psychrometric processes are shown in the figure below.
Question 4
Dew point temperature of air at one atmospheric pressure (1.013 bar) is 18oC. The air dry bulb temperature, is 30oC. The saturation pressure of water at 18oC and 30oC are 0.03072 bar and 0.04241 bar respectively. The specific heat of air and water vapour respectively are 1.005 and 1.88 kJ/kg K and the latent heat of vaporization of water at 0 °C is 2500 kJ/kg. The specific humidity and enthalpy (in kJ/kg of dry air) of this moist air respectively, are ________.
Question 5
A moist air with wet bulb temperature 30
and dry bulb temperature 50
. The atmospheric pressure is 1 bar. with the help of table given below find the partial pressure of vapor.
and dry bulb temperature 50. The atmospheric pressure is 1 bar. with the help of table given below find the partial pressure of vapor. Question 6
Moist air enters the cooling coil with mass flow rate of 20 kg-da/s at dry bulb temperature of 30 °C and humidity ratio of 0.017 kg v/kg da. It leaves the cooling coil at dry bulb temperature of 16 °C and humidity ratio of 0.008 kg v/kg da. If specific heat of humid air is 1.02 kJ/kg da K and latent heat of water vapour is 2500 kJ/kg v. The sensible and latent heat transfer of cooling coil are, respectively
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