Mass Transfer-I Set 3

Specific humidity ✘ Partial pressure of vapour ✘ Both (a) and (b) ✘ Neither (a) nor (b) ✔

an irreversible phenomenon. ✘ a reversible phenomenon. ✘ accompanied by evolution of heat. ✘ both (b) and ✔

evaporation ✘ drift ✘ blowdown and leakage ✘ all (a), (b) and ✔

Heat gain or loss ✘ Flow rate of entering liquid ✘ Flow rate of gas ✘ None of these ✔

affected more by temperature than that for gases. ✘ affected much less by temperature than that for gases. ✘ not affected by the temperature. ✘ none of these. ✔

ammonia in water. ✘ benzol present in coke oven gas by wash oil. ✘ SO2 in alkaline solution. ✘ all (a), (b) and (c). ✔

slope of the operating line in stripping section decreases. ✘ number of plates decreases very slowly first and then more and more rapidly. ✘ total cost first decreases and then increases. ✘ liquid flow increases while the vapor flow decreases for a system. ✔

Lewis number ✘ Schmidt number ✘ Prandtl number ✘ Sherwood number ✔

line always lies above the equilibrium curve. ✘ line always lies below the equilibrium curve. ✘ line can be either above or below the equilibrium curve. ✘ velocity is more than the loading velocity. ✔

latent heat ✘ humid heat ✘ specific heat ✘ sensible heat ✔