Chemical Engineering Archives

7601. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop

Decreases

Remains unchanged

Increases

Decreases exponentially

✅ The correct answer is option C.

7602. Pick out the wrong statement. Generally for physical adsorption, a gas of

Higher molecular weight is adsorbed in preference to a gas of low molecular weight

High critical temperature is adsorbed in preference to a gas of low critical temperature

Low volatility is adsorbed in preference to a gas of high volatility

None of these

✅ The correct answer is option D.

7603. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?

Cost

Availability

Toxicity

Selectivity

✅ The correct answer is option D.

7604. Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is

Not possible in the second case unless vacuum is applied

Not possible in the second case unless high pressure is applied

More readily done in the second case compared to first one

None of these

✅ The correct answer is option C.

7605. Capacity of a rotary dryer depends on its

R.p.m

Inclination with ground surface

Both A & B

Neither A nor B

✅ The correct answer is option C.

7606. In case of an absorber, the operating

Line always lies above the equilibrium curve

Line always lies below the equilibrium curve

Line can be either above or below the equilibrium curve

Velocity is more than the loading velocity

✅ The correct answer is option A.

7607. The equilibrium liquid composition compared to the vapor composition in case of azeotropic mixture is

Less

Same

Either more or less; depends on the system

✅ The correct answer is option C.

7608. Flooding in a distillation column is detected by a sharp

Increase in Murphree plate efficiency

Decrease in pressure drop

Decrease in liquid hold up in the coloumn

Increase in pressure drop

✅ The correct answer is option D.

7609. Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Size

Durability

Porosity

Cost

✅ The correct answer is option C.

7610. The recovery of pencillin from the acidified fermentation broth is done by

Distillation

Evaporation

Absorption

Liquid extraction

✅ The correct answer is option D.