A. Momentum flux
B. Kinematic viscosity
C. Thermal diffusivity
D. Both B. and C.
Correct Answer: D. Both B. and C. ✔
Last Updated: February 16, 2019
Related MCQs
- Which of the following decreases during evaporative cooling process with recirculated water supply ?
- At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?
- It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?
- Steam distillation is not recommended to be used, if the __________?
- Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?
- During constant rate period, the rate of drying decreases with the__________?
- Packed column distillation is limited to the column __________ metres?
- In case of constant underflow extraction operation, the __________ at all solute concentration?
- According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)__________?
- Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the__________?
- Pick out the correct relationship. (Where, Ri = internal reflux ratio Ro = external reflux ratio.) ?
- The humid volume may be increased by increasing the__________?
- Tower diameter may be decreased by__________?
- Raschig ring made of porcelain cannot be used for treating concentrated__________?
- Use of natural draft cooling tower is practised, when the air has low ?
- Molecular diffusivity of a liquid__________?
- At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.?
- All moisture in a non-hygroscopic material is the __________ moisture?
- The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is__________?
- Molecular distillation is__________?
- The most efficient cooling tower out of the following is__________?
- The main reason for dividing a tall packed tower into series of small towers is to__________?
- Acetic acid will be most economically separated from a dilute solution of acetic acid in water by__________?
- Which of the following is not a batch drier ?
- The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is__________?
- Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature ?
- With increase in temperature, the rate of leaching increases, because the__________?
- Leaching rate is independent of the__________?
- Sodium bicarbonate is produced during soda ash manufacture using a __________ tower?
- The cooling effect in a cooling tower cannot be increased by__________?
- For a single component absorber, the operating line is straight only when plotted in term of __________ units?
- Dimension of mass diffusivity is the same as that of__________?
- The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?
- The temperature of water cooled in cooling tower is always __________ temperature of entering air?
- Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant__________?
- With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent__________?
- In liquid extraction, if the selectivity is unity, then__________?
- Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
- __________ extractor uses centrifugal force for separating the two phases?
- The operating cost of a distillation column at minimum reflux ratio is__________?
- A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is__________?
- With increase in temperature, the mutual solubility of two liquids__________?
- The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________?
- Dorr thickener is an equipment used for__________?
- Can the efficiency of a plate in the distillation tower be greater than 100% ?
- Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in__________?
- Reverse osmosis is also called__________?
- Laboratory determination of the diffusivity of vapor is done by __________ method?
- Paper industry employs __________ driers?
- Use of packed towers for distillation is generally limited to the__________?
- __________ extractor is used for the concentration of radioactive nuclear waste?