Chemical Engineering Mcqs

Schmidt number and Lewis number for pure air at atmospheric conditions are respectively__________________?

(A) < 1 and ≈ 1
(B) 1 and 0
(C) > 1 and ≈ 1
(D) 0 and ≈ 1

Submitted By :Ali Uppal

The falling rate period in the drying of a solid is characterised by__________________?

(A) Increase in rate of drying
(B) Increasing temperatures both on the surface and within the solid
(C) Decreasing temperatures
(D) None of these

Submitted By :Ali Uppal

Azeotropism for ethyl alcohol-water system disappears by_____________________?

(A) Increasing temperature
(B) Decreasing pressure
(C) Increasing pressure
(D) No means

Submitted By :Ali Uppal

In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?

(A) The entire amount of C is transferred to solvent B
(B) Less than 2 kg but more than 1 kg of C is transferred to solvent B
(C) Less than 1 kg of C is transferred to B
(D) No amount of C is transferred to B

Submitted By :Ali Uppal

Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are ?

(A) 4
(B) 8
(C) 9
(D) 10

Submitted By :Ali Uppal

Sand is dried in foundries in a ______________________drier?

(A) Rotary
(B) Fluidised bed
(C) Vacuum
(D) Spray

Submitted By :Ali Uppal

Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be_________________?

(A) 1
(B) > 1
(C) < 1
(D) ≤ 1

Submitted By :Ali Uppal

Molarity is defined as the number of gm moles of solute per ________________ of solvent?

(A) Litre
(B) kg
(C) gm
(D) c.c

Submitted By :Ali Uppal

Adsorption is a unit operation which generally involves _______________ systems?

(A) Liquid-solid
(B) Gas-solid
(C) Fluid-solid
(D) Solid-solid

Submitted By :Ali Uppal

Agitator is provided in a crystalliser for____________________?

(A) Avoiding deposition on cooler surfaces
(B) Formation of nuclei
(C) Crystal growth
(D) All

Submitted By :Ali Uppal

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