MCQs

Chemical Engineering MCQs with Explanations

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541Chemical EngineeringMedium

Pick out the wrong statement?

AThe ratio NNu/NRe. Npr is called the Stanton number

BThe Peclet number is a measure of the ratio of energy transport by convection to that by conduction

CThe Colburn jH factor for heat transfer is given by Nst Npr

DFluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection

Correct answer

C. The Colburn jH factor for heat transfer is given by Nst Npr

Explanation

The correct answer is The Colburn jH factor for heat transfer is given by Nst Npr.

542Chemical EngineeringMedium

Sewage sludge is ________ type of non-Newtonian fluid?

ADilatant

BPseudo plastic

CNone of these

DBingham plastic

Correct answer

D. Bingham plastic

Explanation

The correct answer is Bingham plastic.

543Chemical EngineeringMedium

________ is used as a flux in the extraction of iron from iron ore (haematite) in blast furnace?

ABauxite

BLimestone

CManganese

DQuartz

Correct answer

B. Limestone

Explanation

The correct answer is Limestone.

544Chemical EngineeringMedium

Which of the following is not used as a bearing material?

ABronzes

BCopper-lead alloys

CCermets

DBabbitts

Correct answer

C. Cermets

Explanation

The correct answer is Cermets.

545Chemical EngineeringMedium

Pick out the material having minimum Rittinger’s number?

APyrite

BQuartz

CGalena

DCalcite

Correct answer

B. Quartz

Explanation

The correct answer is Quartz.

546Chemical EngineeringMedium

For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately ________ microns?

A500

B50

C5000

Correct answer

A. 500

Explanation

The correct answer is 500.

547Chemical EngineeringMedium

Dense soda ash used in the manufacture of glass, is chemically represented by________?

ANa2CO3

BNa2HCO3

CNa2CO3.10H2O

DNa2CO3.H2O

Correct answer

D. Na2CO3.H2O

Explanation

The correct answer is Na2CO3.H2O.

548Chemical EngineeringMedium

Elastomers are________?

AExemplified by protein derivatives

BHaving very high tensile strength and heat resistance

CThermosetting material

DHaving high flexural strength

Correct answer

D. Having high flexural strength

Explanation

The correct answer is Having high flexural strength.

549Chemical EngineeringMedium

Plants produce carbohydrates from the CO2 present in the atmosphere by________?

AOxidation

BPhotochemical reaction

CNone of these

DPolymerisation

Correct answer

B. Photochemical reaction

Explanation

The correct answer is Photochemical reaction.

550Chemical EngineeringMedium

Hydrolysis of sugar is called________?

ANone of these

BEsterification

CInversion

DHydration

Correct answer

C. Inversion

Explanation

The correct answer is Inversion.

Pick out the wrong statement?

AThe ratio NNu/NRe. Npr is called the Stanton number

BThe Peclet number is a measure of the ratio of energy transport by convection to that by conduction

CThe Colburn jH factor for heat transfer is given by Nst Npr

DFluid movement under the influence of buoyant forces resulting from change in density takes place in case of natural convection

Correct answer

C. The Colburn jH factor for heat transfer is given by Nst Npr

Explanation

The correct answer is The Colburn jH factor for heat transfer is given by Nst Npr.