Chemical Engineering Mcqs

The percentage humidity is less than the relative humidity only at __________________ percent humidity?

(A) Zero
(B) Hundred
(C) Both zero and hundred
(D) None of these

Submitted By :Ali Uppal

At constant pressure, with increase of temperature, the dew point will ________________________?

(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Increase/decrease; depends on the temperature

Submitted By :Ali Uppal

NSc/NPr is called the______________________?

(A) Psychrometric ratio
(B) Lewis number
(C) Sherwood number
(D) Stanton number

Submitted By :Ali Uppal

The Schmidt number which is defined as, μ/ρ D, is the ratio of the_____________________?

(A) Momentum diffusivity to the mass diffusivity
(B) Thermal diffusivity to the mass diffusivity
(C) Momentum diffusivity to the thermal diffusivity
(D) None of these

Submitted By :Ali Uppal

An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii) ____________________?

(A) Less number of trays are required
(B) Composition of the residue remains unchanged
(C) More number of trays are required but the residue composition remains unchanged
(D) More number of trays are required and the residue composition is more dilute in methanol

Submitted By :Ali Uppal

In stripping section of continuous distillation column, the_______________________?

(A) Liquid is stripped of high boiler
(B) Liquid is enriched with high boiler
(C) Vapour is stripped of low boiler
(D) None of these

Submitted By :Ali Uppal

The suitable evaporator for concentration of foaming liquids is a ______________________ evaporator?

(A) Long tube
(B) Short tube
(C) Vacuum
(D) Falling film

Submitted By :Ali Uppal

Mass transfer co-efficient varies as DAB 0.5, according to the _______________ theory?

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

Submitted By :Ali Uppal

The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?

(A) The pressure drop and hence the pumping cost will be very high
(B) It cannot be recovered by distillation
(C) Its recovery cost by distillation may be prohibitively high
(D) It will decompose while recovering by distillation

Submitted By :Ali Uppal

At __________________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation?

(A) Operating
(B) Total
(C) Minimum
(D) Maximum permissible

Submitted By :Ali Uppal

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