Mass Transfer MCQs

Chemical Engineering Objective Questions

Home / Chemical Engineering / Mass Transfer

505. Pick out the wrong statement.

A. With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V ratio

B. The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction

C. Natural draft cooling towers are made of ferro-concrete and its cross-section is wider at the bottom

D. Vanderwall adsorption is also called chemisorption

506. Humid volume, at a given temperature is a/an __________ function of humidity.

507. 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

508. Make up water is supplied during cooling tower operation to compensate for water losses due to

D. All of the above

509. Separation of two or more components of a liquid solution can not be achieved by

A. Fractional crystallisation

B. Liquid extraction

510. Chemisorption compared to physical absorption has

A. Lower adsorption rate

B. Lower capacity of the solvent for the solute gas

C. Increased utilisation of stagnant zones of the liquid phase

D. None of these

511. Flooding in a distillation column is detected by a sharp

A. Increase in Murphree plate efficiency

B. Decrease in pressure drop

C. Decrease in liquid hold up in the coloumn

D. Increase in pressure drop

Page 73 of 94

« 71 72 73 7475 »