Mass Transfer - Practice Test

[#256] On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

(A) Greater degree of separation with a fixed number of trays

(B) Increased reboiler load

(C) Increased reflux ratio

(D) None of these

Correct Answer

(C) Increased reflux ratio

[#257] Steam distillation is not recommended to be used, if the

(A) Azeotropic mixture is to be separated and the final product is miscible with water

(B) Liquids decompose, if distilled directly at atmospheric pressure

(C) Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

(D) Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

Correct Answer

(A) Azeotropic mixture is to be separated and the final product is miscible with water

[#258] 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

Correct Answer

(C) Increased utilisation of stagnant zones of the liquid phase

[#259] At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

(A) 100

(B) 0

(C) 50

(D) Between 0 and 100

Correct Answer

(B) 0

[#260] Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

(A) Unbound

(B) Free

(C) Critical

(D) Bound

Correct Answer

(B) Free

Mass Transfer - Study Mode

[#256] On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in

Correct Answer

[#257] Steam distillation is not recommended to be used, if the

Correct Answer

[#258] Chemisorption compared to physical absorption has

Correct Answer

[#259] At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

Correct Answer

[#260] Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

Correct Answer