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Chemical Engineering MCQs with Explanations

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1331Chemical EngineeringMedium

According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to________?

A2f

C1/f

Df/2

Correct answer

D. f/2

Explanation

The correct answer is f/2.

1332Chemical EngineeringMedium

Arrhenius equation shows the variation of ________ with temperature?

AFrequency factor

BRate constant

CReaction rate

DEnergy of activation

Correct answer

B. Rate constant

Explanation

The correct answer is Rate constant.

1333Chemical EngineeringMedium

Gibbs free energy (F) is defined as________?

AF = H – TS

BF = E – TS

Correct answer

A. F = H – TS

Explanation

The correct answer is F = H – TS.

1334Chemical EngineeringMedium

In a roll crusher, both the rolls________?

AHave the same diameter

BAll A., B. and C.

CAre rotated towards each other

DRun either at the same or different speeds

Correct answer

B. All A., B. and C.

Explanation

The correct answer is All A., B. and C..

1335Chemical EngineeringMedium

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

ACritical

BBound

CFree

DUnbound

Correct answer

D. Unbound

Explanation

The correct answer is Unbound.

1336Chemical EngineeringMedium

Dryer widely used in a textile industry is ________ dryer?

ATunnel

BCylinder

CFestoon

DConveyor

Correct answer

D. Conveyor

Explanation

The correct answer is Conveyor.

1337Chemical EngineeringMedium

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the________?

APipe length

BTime taken to close the valve

CAll A., B. and C.

DFluid velocity in the pipe

Correct answer

C. All A., B. and C.

Explanation

The correct answer is All A., B. and C..

1338Chemical EngineeringMedium

Pick out the true statement pertaining to water treatment?

ANormally, the turbidity is removed by adding a coagulant prior to sedimentation

BSlow sand filters can remove colour completely

CActivated carbon can be used for taste & odour control without subsequent filtration

DApplication of activated carbon reduces the temporary hardness of water

Correct answer

A. Normally, the turbidity is removed by adding a coagulant prior to sedimentation

Explanation

The correct answer is Normally, the turbidity is removed by adding a coagulant prior to sedimentation.

1339Chemical EngineeringMedium

An ejector is used to________?

AIncrease pressure

BIncrease temperature

CNone of these

DRemove condensate

Correct answer

C. None of these

Explanation

The correct answer is None of these.

1340Chemical EngineeringMedium

Ideal gas law is applicable at________?

ALow T, low P

BHigh T, high P

CHigh T, low P

DLow T, high P

Correct answer

C. High T, low P

Explanation

The correct answer is High T, low P.

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