Related Mcqs:

1. The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be ______________ °C ?

   A. 25
   B. > 25
   C. < 25
   D. – 25

2. An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?

   A. 0.048
   B. 0.079
   C. 0.122
   D. 0.152

3. Dry bulb temperature of the gas is _____________ the wet bulb temperature?

   A. Less than
   B. More than
   C. Equal to
   D. None of these

4. At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?

   A. 0.0
   B. 0.2
   C. 0.4
   D. 1.0

5. Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?

   A. p = P
   B. p >>P
   C. p < P
   D. p << P

6. Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and _________________?

   A. Humidified with wet bulb temperature decreasing
   B. Humidified at constant wet bulb temperature
   C. Dehumidified
   D. None of these

7. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the _________________ remains constant ?

   A. Wet bulb temperature
   B. Partial pressure of water vapor
   C. Relative humidity
   D. None of these

8. Wet bulb and dry bulb temperatures becomes identical at _______________ percent saturation curve?

   A. 100
   B. 50
   C. 78
   D. None of these

9. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________?

   A. +ve
   B. -ve
   C. Zero
   D. None of these

10. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be__________________?

    A. Cooled
    B. Humidified
    C. Both A. & B.
    D. Dehumidified