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Chemical Engineering MCQs with Explanations

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341Chemical EngineeringMedium

Thermal efficiency of an open hearth furnace may be about ________ percent?

B50

C20

D80

Correct answer

C. 20

Explanation

The correct answer is 20.

342Chemical EngineeringMedium

Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about ________ mm Hg (referred to a 760 mm mercury barometer)?

A450

B250

C750

D650

Correct answer

D. 650

Explanation

The correct answer is 650.

343Chemical EngineeringMedium

Pick out the correct statement?

AMelting of ice involves increase in enthalpy and a decrease in randomness

BThe internal energy of an ideal gas depends only on its pressure

CLike internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero

DMaximum work is done under reversible conditions

Correct answer

D. Maximum work is done under reversible conditions

Explanation

The correct answer is Maximum work is done under reversible conditions.

344Chemical EngineeringMedium

________ mill is not a revolving mill?

APebble

BCage

CTube

DCompartment

Correct answer

B. Cage

Explanation

The correct answer is Cage.

345Chemical EngineeringMedium

With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter________?

ARemain unaffected

BNone of these

CDecreases

DIncreases

Correct answer

C. Decreases

Explanation

The correct answer is Decreases.

346Chemical EngineeringMedium

Raoult’s law is not applicable to the________?

ASolutions containing non-volatile solute

BSolutes which dissociate or associate in the particular solution

CConcentrated solutions

DBoth B. & C.

Correct answer

D. Both B. & C.

Explanation

The correct answer is Both B. & C..

347Chemical EngineeringMedium

Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to________?

ABainite

BMartensite

CTroostite

DSorbite

Correct answer

A. Bainite

Explanation

The correct answer is Bainite.

348Chemical EngineeringMedium

In a furnace operation, which is not preheated?

ABoth A. and B.

BSolid fuels

CNeither A. nor B.

DHydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

Correct answer

A. Both A. and B.

Explanation

The correct answer is Both A. and B..

349Chemical EngineeringMedium

(Le/D) for a Tee (used as elbow, entering run) would be around ________?

A160

B60

D200

Correct answer

B. 60

Explanation

The correct answer is 60.

350Chemical EngineeringMedium

Adhesives________?

ACure instantaneously after application on a surface

BCan’t join two dissimilar metals

CNone of these

DCan’t be used in the form of pressure sensitive tapes

Correct answer

C. None of these

Explanation

The correct answer is None of these.

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