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Chemical Engineering MCQs with Explanations

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2201Chemical EngineeringMedium

Pick out the wrong statement?

AOils and fats are alkaloids

BEnzyme is a complex nitrogenous compound

CPasteurisation of milk involves moderate heating followed by cooling

DBakeries and breweries make use of yeasts

Correct answer

A. Oils and fats are alkaloids

Explanation

The correct answer is Oils and fats are alkaloids.

2202Chemical EngineeringMedium

Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be ________ ft?

B37

C40

D34

Correct answer

A. 8

Explanation

The correct answer is 8.

2203Chemical EngineeringMedium

If the discharge of a centrifugal pump is throttled, then its suction lift________?

AData insufficient to predict

BRemains unchanged

CIncreases

DDecreases

Correct answer

C. Increases

Explanation

The correct answer is Increases.

2204Chemical EngineeringMedium

Blue vitriol is chemically________?

AAluminium sulphate

BFerrous sulphate

CCopper sulphate

DCopper nitrate

Correct answer

C. Copper sulphate

Explanation

The correct answer is Copper sulphate.

2205Chemical EngineeringMedium

The ratio, (propeller agitator dia/tank dia) is normally taken as________?

A0.15-030

B0.75-0.85

C0.60-0.90

D0.5-0.65

Correct answer

A. 0.15-030

Explanation

The correct answer is 0.15-030.

2206Chemical EngineeringMedium

Sulphur removal by heating of pyrite ore in presence of air is called its ________?

ARoasting

BReduction

CSmelting

DCalcination

Correct answer

A. Roasting

Explanation

The correct answer is Roasting.

2207Chemical EngineeringMedium

The boundary layer thickness at a given section along a flat plate ________ with increasing Reynold’s number?

ARemain same

BDecreases

CIncreases

DMay increase or decrease

Correct answer

B. Decreases

Explanation

The correct answer is Decreases.

2208Chemical EngineeringMedium

Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for________?

AConstant relative volatility

BAll A., B. and C.

CTotal reflux

DConstant molal overflow

Correct answer

B. All A., B. and C.

Explanation

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

2209Chemical EngineeringMedium

The colour of gasoline is an indication of its ________?

ANone of these

BGum forming tendency & thoroughness of refining

CLead susceptibility

DOctane number

Correct answer

B. Gum forming tendency & thoroughness of refining

Explanation

The correct answer is Gum forming tendency & thoroughness of refining.

2210Chemical EngineeringMedium

Variables affecting the rate of homogeneous reactions are________?

APressure, temperature and composition

BTemperature and composition only

CPressure and temperature only

DPressure and composition only

Correct answer

A. Pressure, temperature and composition

Explanation

The correct answer is Pressure, temperature and composition.

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