Q. The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

View solution

Q. Pick out the wrong statement. Generally for physical adsorption, a gas of

View solution

Q. In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in

View solution

Q. Which of the following is an undesirable property in a tower packing ?

View solution

Q. Water entrained by circulating air in cooling towers is termed as

View solution

Q. A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

View solution

Q. With increase in temperature, the rate of leaching increases, because the

View solution

Q. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

View solution

Q. The apex of an equilateral-triangular coordinate (in ternary liquid system) represents a/an

View solution

Q. A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?

View solution

Q. Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent ?

View solution

Q. Boiling point diagram is

View solution

Q. When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

View solution

Q. Steam distillation is used to

View solution

Q. Freundlich equation applies to the adsorption of solute from

View solution

Q. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

View solution

Q. A packed tower compared to a plate tower for a particular mass transfer operation

View solution

Q. Which of the following is the most commonly used leaching solvent in vegetable oil industry ?

View solution

Q. In an absorber, HETP does not vary with the

View solution

Q. Large quantity of silica gel is normally dried in a __________ dryer.

View solution