Related Questions

__________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
A Sherwood
B Stanton
C Lewis
D Peclet
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
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
A Packing may be crushed due to thermal expansion/contraction of the components of the equipments
B Pressure drop in the equipment will be very high
C Viscosity variation of the fluids may cause channeling/flooding
D None of these
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
A Low pressure drop and high hold up
B High pressure drop and low hold up
C Low pressure drop and low hold up
D High pressure drop and high hold up
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
Heat dissipation in cooling towers is mainly by
A Conduction
B Convection
C Evaporation
D Radiation
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
Water entrained by circulating air in cooling towers is termed as
A Drift
B Blow down
C Vapor load
D None of these
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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