A. High pressure drop
B. Low pressure drop
C. Low velocity of the liquid
D. High temperature
Correct Answer: High pressure drop ✔
Last Updated: February 17, 2019
Related MCQs
- Raoult’s law is applicable to the__________?
- Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer?
- Pick out the system with minimum boiling azeotrope at 1 atm ?
- The film penetration model of mass transfer was enunciated by__________?
- (NRe . NSc) is termed in mass transfer operation as the __________ number?
- In McCabe-Thiele method, at infinite reflux ratio__________?
- With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux__________?
- The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called__________?
- The recovery of penicillin from the acidified fermentation broth is done by__________?
- Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be__________?
- Molarity is defined as the number of gm moles of solute per __________ of solvent?
- Adsorption is a unit operation which generally involves __________ systems?
- Agitator is provided in a crystalliser for__________?
- Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of__________?
- Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number?
- Cox chart is useful in the design of__________?
- The binary diffusivity in gases and liquids vary respectively as__________?
- Decoction refers to the use of solvent__________?
- Ordinary diffusion process is also called __________ diffusion?
- Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower?
- The solvent used in liquid-liquid extraction should have __________ less than one?
- Which of the following equipments is not used for liquid dispersion ?
- Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the__________?
- Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________?
- The falling rate period in the drying of a solid is characterised by__________?
- Azeotropism for ethyl alcohol-water system disappears by__________?
- In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?
- Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?
- Sand is dried in foundries in a __________drier?
- Binary distillation involves the mass transfer by __________ at the gas-liquid interface?
- Which of the following adsorbent is used to decolourise yellow glycerine ?
- Surface renewal model of mass transfer was enunciated by__________?
- If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm ?
- __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower?
- Gaseous diffusivity at atmospheric pressure is of the order of __________ cm2/second?
- Drift in a cooling tower is __________?
- HETP is numerically equal to HTU, only when the operating line __________?
- At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent __________?
- Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?
- 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 __________?
- Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation?
- Humid volume is the total volume in m3 of 1 kg of __________?
- Which of the following is a suitable absorbent for removal of H2S from natural gas ?
- In case of non-ideal gases and liquids, the molal diffusivity __________?
- Unit of molal diffusivity is__________?
- Milk is dried usually in a __________ dryer?
- Penetration model (theory) for mass transfer was enunciated by __________?
- For an absorber, both equilibrium and operating line will be straight for __________?
- 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__________?
- Advantage of continuous drying over batch drying is that the__________?
- The relative saturation of an unsaturated mixture of gas and vapor is independent of the__________?