In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________?

Related Mcqs:

1. 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

2. Can a cooling tower cool water below the wet bulb temperature of inlet air ?

   A. Yes
   B. No
   C. Yes; but height of cooling tower will be prohibitively high
   D. Yes; but the air flow rate should be excessively high

3. 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

4. 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

5. The temperature of water cooled in cooling tower is always _________________ temperature of entering air?

   A. More than the wet bulb
   B. Less than the wet bulb
   C. Equal to the wet bulb
   D. Equal to the dry bulb

6. 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

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

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

9. For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________?

   A. 0.60
   B. 0.24
   C. 1
   D. 0.72

10. For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because__________________?

    A. Water has a high latent heat of evaporation
    B. Lewis number is close to unity
    C. They are always equal under all circumstances
    D. Solubility of the components of air in water is very small