21401. Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )
21402. Separation of __________ employs gaseous diffusion process.
21403. For water-ethanol system, the minimum reflux ratio
21404. The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3)
21405. Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.
21406. Experimental determination of __________ is done by wetted wall column method.
21407. Who founded Pratyaksha Raksha Daiva Sabha for social reformation of Christians in Kerala?
21408. In liquid extraction, if the selectivity is unity, then
21409. Paper industry employs __________ driers.
21410. Which of the following has the same dimension as mass diffusivity ?
21411. Pick out the wrong statement pertaining to the cooling towers.
21412. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is
21413. Leaching of coarse solid lumps is also termed as
21414. The main reason for dividing a tall packed tower into series of small towers is to
21415. Co-current absorbers are usually used when the gas to be dissolved in the liquid is
21416. At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?
21417. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.
21418. With the lowering of equiliDrium pressure, at a given temperature, the amount of ad-sorbate on the adsorbent
21419. Mass transfer co-efficient is defined as
21420. When an unsaturated air-water mixture is heated at constant pressure, then
21421. During sensible cooling process
21422. At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.
21423. In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is
21424. The outbreak of which mosquito born virus causes birth defects in new born babies has been reported in Latin America?
21425. The value of L/mG ratio for economical absorption operation ranges from
21426. Large scale usage of flash distillation is practised in
21427. High pressure at the bottom of a distillation tower handling heat sensitive materials results in
21428. Alcohol is dehydrated using __________ distillation.
21429. Separation of two volatile liquids by distillation makes use of their
21430. Which of the following increases during evaporative cooling process with recirculated water supply ?
21431. Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.
21432. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
21436. The operating line for an absorber is curved, when plotted in terms of
21437. Relative volatility does not change appreciably with the change in
21438. Boiling point diagram is not affected by the ambient
21439. The dew point of a saturated gas phase equals the __________ temperature.
21440. A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?
21441. In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
21442. For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.
21443. When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
21444. Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.
21445. For a binary mixture with low relative volatility, continuous rectification to get pure products will require
21446. The efficiency of a plate column will be maximum, when the flow is ideal __________ the plate.
21447. Heat load in a cooling tower
21448. In case of absorption with exothermic reaction, for fluids having
21449. Detergent solution is dried to a powder in a
21450. Which of the following mixtures does not form an azeotrope at atmosheric pressure?