MCQs

Chemical Engineering MCQs with Explanations

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2161Chemical EngineeringMedium

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe, where the wall heat flux is constant, is________?

A120.36

BDependent on NRe only

C4.36

D2.36

Correct answer

C. 4.36

Explanation

The correct answer is 4.36.

2162Chemical EngineeringMedium

Reduction ratio of crushers is the________?

ADetermining factor for minimum dia of the feed and the product

BNone of these

CRatio of discharge opening to feed opening

DRatio of feed opening to discharge opening

Correct answer

D. Ratio of feed opening to discharge opening

Explanation

The correct answer is Ratio of feed opening to discharge opening.

2163Chemical EngineeringMedium

Lenz’s law results from the law of conservation of________?

AMass

BNone of these

CEnergy

DMomentum

Correct answer

C. Energy

Explanation

The correct answer is Energy.

2164Chemical EngineeringMedium

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

AFlow rate of inlet air

BRelative humidity of outlet air

CTemperature of the solid

DHumidity of inlet air

Correct answer

C. Temperature of the solid

Explanation

The correct answer is Temperature of the solid.

2165Chemical EngineeringMedium

Generally ________ are subjected to galvanising (i.e., zinc coating)?

ANon-metals

BLow carbon steels

CStainless steel

DNon-ferrous metals

Correct answer

B. Low carbon steels

Explanation

The correct answer is Low carbon steels.

2166Chemical EngineeringMedium

Gasoline extracted from natural gas (by compression and cooling) is called the ________ gasoline?

AStraight run

BCasing head

CPolymer

DUnleaded

Correct answer

D. Unleaded

Explanation

The correct answer is Unleaded.

2167Chemical EngineeringMedium

There is practically no alternative/competitor to ________ in the beneficiation treatment of sulphide ores?

ATabling

BClassification

CJigging

DFroth floatation

Correct answer

D. Froth floatation

Explanation

The correct answer is Froth floatation.

2168Chemical EngineeringMedium

Ringelmann chart No. 2 corresponds to ________ percent black smoke?

A20

B40

C10

D80

Correct answer

B. 40

Explanation

The correct answer is 40.

2169Chemical EngineeringMedium

Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________ theory?

ANone of these

BPenetration

CFilm

DSurface renewal

Correct answer

B. Penetration

Explanation

The correct answer is Penetration.

2170Chemical EngineeringMedium

Chilled iron castings are________?

AHighly wear resistant

BEasily machinable

CSoft on surface

DNone of these

Correct answer

A. Highly wear resistant

Explanation

The correct answer is Highly wear resistant.

Reduction ratio of crushers is the________?

ADetermining factor for minimum dia of the feed and the product

BNone of these

CRatio of discharge opening to feed opening

DRatio of feed opening to discharge opening

Correct answer

D. Ratio of feed opening to discharge opening

Explanation

The correct answer is Ratio of feed opening to discharge opening.