Related Questions

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
A D
B D2
C D0.5
D $$\frac{1}{{\text{D}}}$$
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
A CO2
B SO2
C NH3
D None of these
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
A Calculated
B Unknown
C Known
D Not required
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of
A Concentrations
B Chemical potentials
C Activity co-efficients
D Mass transfer co-efficients
The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is
A Nusselt number
B Sherwood number
C Schmidt number
D Stanton number
Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
A Sherwood
B Schmidt
C Peclet
D Stanton
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
A Schmidt
B Sherwood
C Peclet
D Stanton

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