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Chemical Engineering MCQs with Explanations

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191Chemical EngineeringMedium

Phthalic anhydride is used________?

AIn making PVC

BAs plasticisers

CFor making nylon-6

DIn insecticides manufacture

Correct answer

B. As plasticisers

Explanation

The correct answer is As plasticisers.

192Chemical EngineeringMedium

For all positive reaction orders for a particular duty?

AReactor size is independent of the type of flow

BDensity variation during reaction affects design

CRatio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

DMixed reactor is always larger than the plug-flow reactor

Correct answer

D. Mixed reactor is always larger than the plug-flow reactor

Explanation

The correct answer is Mixed reactor is always larger than the plug-flow reactor.

193Chemical EngineeringMedium

Batch tray dryers suffers from the disadvantage of________?

AAll ‘a’, ‘b’ & ‘c’

BNon-uniform & low production rate

CHigh maintenance cost

DHigh labour cost & low heat economy

Correct answer

D. High labour cost & low heat economy

Explanation

The correct answer is High labour cost & low heat economy.

194Chemical EngineeringMedium

Vulcanisation of rubber does not increase its________?

ASoftness

BOxidation resistance

CElasticity & water solubility

DWeight & strength

Correct answer

A. Softness

Explanation

The correct answer is Softness.

195Chemical EngineeringMedium

For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would?

AIncrease

BDecrease

CFirst increase and then decrease

DFirst decrease and then increase

Correct answer

C. First increase and then decrease

Explanation

The correct answer is First increase and then decrease.

196Chemical EngineeringMedium

The main ore of uranium is ________?

AChalcopyrite

BMonazite sand

CPitchblende

DCassiterite

Correct answer

C. Pitchblende

Explanation

The correct answer is Pitchblende.

197Chemical EngineeringMedium

Ammonium phosphate is a ________ fertilizer?

APhosphatic

BComplex

CNitrogenous

DMixed

Correct answer

D. Mixed

Explanation

The correct answer is Mixed.

198Chemical EngineeringMedium

________ fibres are made of polyamides?

AOrion

BRayon

CNylon

DDacron

Correct answer

C. Nylon

Explanation

The correct answer is Nylon.

199Chemical EngineeringMedium

Gibbs phase rule finds application, when heat transfer occurs by________?

AConvection

BRadiation

CConduction

DCondensation

Correct answer

D. Condensation

Explanation

The correct answer is Condensation.

200Chemical EngineeringMedium

The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about ________ percent?

A60

B100

C95

D30

Correct answer

A. 60

Explanation

The correct answer is 60.

For all positive reaction orders for a particular duty?

AReactor size is independent of the type of flow

BDensity variation during reaction affects design

CRatio of the volume of the mixed reactor to that of the plug-flow reactor decreases with order

DMixed reactor is always larger than the plug-flow reactor

Correct answer

D. Mixed reactor is always larger than the plug-flow reactor

Explanation

The correct answer is Mixed reactor is always larger than the plug-flow reactor.