Chemical Engineering Mcqs

At 750°K and 1 atm, the approximate value of Schmidt number for air is_________________?

(A) 0.01
(B) 0.1
(C) 1
(D) 10

Submitted By :Ali Uppal

For water-ethanol system, the minimum reflux ratio_____________________?

(A) Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
(B) Is computed from the intercept of the operating line
(C) Cannot be computed
(D) Is the optimum reflux ratio

Submitted By :Ali Uppal

Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?

(A) K ∝D
(B) K ∝√D
(C) K ∝D1.5
(D) K ∝D2

Submitted By :Ali Uppal

Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?

(A) Packed towers
(B) Plate towers
(C) Spray towers
(D) Wetted wall columns

Submitted By :Ali Uppal

Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component ‘A’ to that of component ‘B’, when_________________?

(A) Only vapor phase follows Raoult’s law
(B) Only liquid phase obeys Dalton’s law
(C) Liquid phase obeys Dalton’s law and vapor phase obeys Raoult’s law
(D) Vapor phase obeys Dalton’s law and liquid phase obeys Raoult’s law

Submitted By :Ali Uppal

Calculation of mass transfer co-efficient is mostly/normally done using ______________ theory?

(A) Surface renewal
(B) Film
(C) Penetration
(D) None of these

Submitted By :Ali Uppal

Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the ___________________ moisture ?

(A) Unbound
(B) Critical
(C) Free
(D) Bound

Submitted By :Ali Uppal

The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_________________?

(A) Differential heat of adsorption
(B) Heat of wetting
(C) Integral heat of adsorption
(D) None of these

Submitted By :Ali Uppal

Flash distillation is _______________________?

(A) Same as differential distillation
(B) Used for multi-component systems like crude refining
(C) Same as simple distillation
(D) Most useful for handling binary systems

Submitted By :Ali Uppal

When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ?

(A) The partial pressure of water vapour increases
(B) The specific humidity decreases
(C) The relative humidity increases
(D) The relative humidity decreases

Submitted By :Ali Uppal

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