Mass Transfer MCQ Questions & Answers | Chemical Engineering

A. At ambient temperature

B. At its boiling point

C. In its vapor form

D. None of these

A. 1

B. > 1

C. < 1

D. 0

A. The system comprises of partially mis-cible liquids

B. The system comprises of miscible liquids

C. The system comprises of an azeotrope

D. On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

A. 0

B. ∞

C. -ve

D. +ve

A. Yes

B. Normally not; but is possible if infinite number of plates are put

C. Never

D. Yes ; if the reflux ratio is maximum

A. Decreases in winter

B. Increases in winter

C. Increases in summer

D. None of these

A. Natural draft cooling tower

B. Induced draft cooling tower

C. Spray chamber

D. None of these

A. A horizontal line on the humidity chart indicates the temperature changes at constant molal humidity

B. When water is cooled from 80 to 70°C by exposure to the air with a wet bulb temperature of 60°C, then both the approach & the range would be 10°C

C. For unsaturated air-water vapor mixture at atmospheric conditions, the wet bulb temperature & adiabatic cooling lines are the same

D. Relative saturation of unsaturated mixture of water vapor & air can not be increased by either reducing the mixture temperature or by increasing the total pressure

A. Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse

B. Packed towers are preferred over plate towers for handling corrosive and foamy liquids

C. Diameter of randomly packed tower is normally more than 1.2 metres

D. Due to uneven supply and improper distribution of liquid, problem of channeling, loading & flooding is generally encountered in packed towers

A. Atmospheric

B. Vacuum

C. High pressure

D. None of these