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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

NSc/NPr is called the______________________?

A Psychrometric ratio
B Lewis number
C Sherwood number
D Stanton number
Correct Answer: Lewis number

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
Correct Answer: Momentum diffusivity to the mass diffusivity

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
Correct Answer: Less number of trays are required

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
Correct Answer: Liquid is enriched with high boiler

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

A Long tube
B Short tube
C Vacuum
D Falling film
Correct Answer: Long tube

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

A Film
B Surface renewal
C Penetration
D None of these
Correct Answer: Surface renewal

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
Correct Answer: Its recovery cost by distillation may be prohibitively high

Absorption accompanied by heat evolution results in____________________?

A Increased capacity of the absorber
B Increase in equilibrium solubility
C Decrease in equilibrium solubility
D None of these
Correct Answer: Decrease in equilibrium solubility

Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?

A Mass transfer is accompanied by reaction
B Diffusion of A is in stagnant medium B
C Molecular mean free path is high
D There is equimolar counter diffusion
Correct Answer: There is equimolar counter diffusion

With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system) ?

A Increases
B Decreases
C Remain unaffected
D Increases Linearly
Correct Answer: Increases
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