Questions and answers for exam Preparation

MCQs

Total Questions : 3241 | Page 259 of 325 pages

Question 2581. For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?

Increases
Decreases
Remain same
Either A. or B.; depends on the gas

Discuss Question

Answer: Option A. -> Increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2582. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

(De.t)1/2
(De/t)1/2
(4De/πt)1/2
(4De/t)

Discuss Question

Answer: Option C. -> (4De/πt)1/2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2583. For absorbing a sparingly soluble gas in a liquid, the_____________________?

Gas side co-efficient should be increased
Liquid side coefficient should be increased
Gas side co-efficient should be decreased
Liquid side co-efficient should be decreased

Discuss Question

Answer: Option B. -> Liquid side coefficient should be increased
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2584. The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for _______________________?

Steady state equimolar counter diffusion
Fick’s first law of diffusion
Steady state diffusion for stagnant case
Liquid M.T.C. by penetration theory

Discuss Question

Answer: Option A. -> Steady state equimolar counter diffusion
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2585. Coffee is prepared from coffee beans by leaching with____________________?

Cold water
Hot water
Dilute hot caustic solution
Naphtha

Discuss Question

Answer: Option B. -> Hot water
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2586. Which of the following parameters remains constant during chemical dehumidification ?

Dry bulb temperature
Partial pressure of vapour
Wet bulb temperature
None of these

Discuss Question

Answer: Option A. -> Dry bulb temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2587. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?