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Chemical Engineering MCQs with Explanations

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3781Chemical EngineeringMedium

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is________?

A3CaO. SiO2

B2CaO. SiO2

C5CaO. 3 Al2O3

D3CaO. Al2O3

Correct answer

C. 5CaO. 3 Al2O3

Explanation

The correct answer is 5CaO. 3 Al2O3.

3782Chemical EngineeringMedium

________ plant emits large amount of SO2 as an air pollutant?

ANitric acid

BChlor alkali

CSulphuric acid

DIron & steel

Correct answer

C. Sulphuric acid

Explanation

The correct answer is Sulphuric acid.

3783Chemical EngineeringMedium

Centrifugal pump is normally classified on the basis of the________?

AType of casing

Brpm

CImpeller blade angle

DNumber of blades in impeller

Correct answer

A. Type of casing

Explanation

The correct answer is Type of casing.

3784Chemical EngineeringMedium

The rate constant of a reaction is a function of the ________?

AExtent of reaction

BInitial concentration of the reactants

CTime of reaction

DTemperature of the system

Correct answer

D. Temperature of the system

Explanation

The correct answer is Temperature of the system.

3785Chemical EngineeringMedium

Heating of ortho-phosphoric acid to 250°C produces________?

ANone of these

BNo change in it

CPyrophosphoric acid

DMeta-phosphoric acid

Correct answer

C. Pyrophosphoric acid

Explanation

The correct answer is Pyrophosphoric acid.

3786Chemical EngineeringMedium

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area________?

APasses through a maxima

BIncreases

CRemain constant

DDecreases

Correct answer

A. Passes through a maxima

Explanation

The correct answer is Passes through a maxima.

3787Chemical EngineeringMedium

Which of the following can be used to create a flow of gas, where no significant compression is required?

AAxial flow compressor

BBlower

CCentrifugal compressor

DReciprocating compressor

Correct answer

B. Blower

Explanation

The correct answer is Blower.

3788Chemical EngineeringMedium

The rate of reaction does not decrease appreciably as the reaction proceeds in case of ________ reactions?

AAutothermal

BAutocatalytic

CExothermic

DEndothermic

Correct answer

B. Autocatalytic

Explanation

The correct answer is Autocatalytic.

3789Chemical EngineeringMedium

Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?

ADeuterium and tritium

BHeavy water

CU-233

DThorium

Correct answer

A. Deuterium and tritium

Explanation

The correct answer is Deuterium and tritium.

3790Chemical EngineeringMedium

Drag force acting on a body does not depend upon the________?

AVelocity of the body

BDensity of the body

CProjected area of the body

DDensity of the fluid

Correct answer

B. Density of the body

Explanation

The correct answer is Density of the body.

3781Chemical EngineeringMedium

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is________?

A3CaO. SiO2

B2CaO. SiO2

C5CaO. 3 Al2O3

D3CaO. Al2O3

Correct answer

C. 5CaO. 3 Al2O3

Explanation

The correct answer is 5CaO. 3 Al2O3.

3782Chemical EngineeringMedium

________ plant emits large amount of SO2 as an air pollutant?

ANitric acid

BChlor alkali

CSulphuric acid

DIron & steel

Correct answer

C. Sulphuric acid

Explanation

The correct answer is Sulphuric acid.

3783Chemical EngineeringMedium

Centrifugal pump is normally classified on the basis of the________?

AType of casing

Brpm

CImpeller blade angle

DNumber of blades in impeller

Correct answer

A. Type of casing

Explanation

The correct answer is Type of casing.

3784Chemical EngineeringMedium

The rate constant of a reaction is a function of the ________?

AExtent of reaction

BInitial concentration of the reactants

CTime of reaction

DTemperature of the system

Correct answer

D. Temperature of the system

Explanation

The correct answer is Temperature of the system.

3785Chemical EngineeringMedium

Heating of ortho-phosphoric acid to 250°C produces________?

ANone of these

BNo change in it

CPyrophosphoric acid

DMeta-phosphoric acid

Correct answer

C. Pyrophosphoric acid

Explanation

The correct answer is Pyrophosphoric acid.

3786Chemical EngineeringMedium

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area________?

APasses through a maxima

BIncreases

CRemain constant

DDecreases

Correct answer

A. Passes through a maxima

Explanation

The correct answer is Passes through a maxima.

3787Chemical EngineeringMedium

Which of the following can be used to create a flow of gas, where no significant compression is required?

AAxial flow compressor

BBlower

CCentrifugal compressor

DReciprocating compressor

Correct answer

B. Blower

Explanation

The correct answer is Blower.

3788Chemical EngineeringMedium

The rate of reaction does not decrease appreciably as the reaction proceeds in case of ________ reactions?

AAutothermal

BAutocatalytic

CExothermic

DEndothermic

Correct answer

B. Autocatalytic

Explanation

The correct answer is Autocatalytic.

3789Chemical EngineeringMedium

Which of the following is a fuel for a fusion reactor (thermonuclear reactor)?

ADeuterium and tritium

BHeavy water

CU-233

DThorium

Correct answer

A. Deuterium and tritium

Explanation

The correct answer is Deuterium and tritium.

3790Chemical EngineeringMedium

Drag force acting on a body does not depend upon the________?

AVelocity of the body

BDensity of the body

CProjected area of the body

DDensity of the fluid

Correct answer

B. Density of the body

Explanation

The correct answer is Density of the body.