A. Large latent heat
B. Low viscosity
C. Small latent heat
D. None of these
Related Mcqs:
- 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 - The cooling effect in a cooling tower can be speeded up by _______________________?
A. Increasing the air velocity and area of exposed wet surface
B. Reducing the barometric pressure
C. Reducing the humidity of the air
D. All A., B. and C. - The cooling effect in a cooling tower cannot be increased by_____________________?
A. Increasing the air velocity over the wet surfaces
B. Reducing the humidity of entering air
C. Lowering the barometric pressure
D. None of these - The term “cooling range” in a cooling tower refers to the difference in the temperature of____________________?
A. Cold water leaving the tower and the wet bulb temperature of the surrounding air
B. Hot water entering the tower and the wet bulb temperature of the surrounding air
C. Hot water entering the tower and the cooled water leaving the tower
D. None of these - Make up water is required in a cooling tower to replace the water lost by___________________?
A. Evaporation
B. Drift
C. Blowdown and leakage
D. All A., B. and C. - Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?
A. Evaporation
B. Blowdown
C. Entrainment
D. All A., B. & C. - Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the ________________ temperature?
A. Dry-bulb
B. Wet-bulb
C. Dew point
D. Adiabatic saturation - Which of the following increases during evaporative cooling process with recirculated water supply ?
A. Wet bulb temperature
B. Relative humidity
C. Partial pressure of vapour
D. Both B. and C. - 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 - 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________________________?
A. Range is 15°F
B. Approach is 10°F
C. Both A. & B.
D. Neither A. nor B.
