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Chemical Engineering MCQs with Explanations

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411Chemical EngineeringMedium

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant?

ANaphthalene

BEthylene

CBenzol

DPitch-creosote mixture (PCM)

Correct answer

B. Ethylene

Explanation

The correct answer is Ethylene.

412Chemical EngineeringMedium

The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ________?

A16

B15.5

C16.5

D17

Correct answer

C. 16.5

Explanation

The correct answer is 16.5.

413Chemical EngineeringMedium

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the________?

ATemperature falls

BPressure rises

CTemperature rises

DPressure falls

Correct answer

C. Temperature rises

Explanation

The correct answer is Temperature rises.

414Chemical EngineeringMedium

For the flow of gases through a capillary, with increase in temperature, the permeability ________ as per Knudsen law?

AEither A. or B.; depends on the gas

BDecreases

CRemain same

DIncreases

Correct answer

D. Increases

Explanation

The correct answer is Increases.

415Chemical EngineeringMedium

In a manufacturing industry, breakeven point occurs, when the________?

AAnnual sales equals the fixed cost

BAnnual profit equals the expected value

CTotal annual rate of production equals the assigned value

DTotal annual product cost equals the total annual sales

Correct answer

D. Total annual product cost equals the total annual sales

Explanation

The correct answer is Total annual product cost equals the total annual sales.

416Chemical EngineeringMedium

Steam is intermittently admitted into the fuel bed during the production of producer gas to________?

AMinimise the chances of clinker formation

BIncrease the gas production rate

CConvert CO to CO2

DIncrease the combustion rate

Correct answer

A. Minimise the chances of clinker formation

Explanation

The correct answer is Minimise the chances of clinker formation.

417Chemical EngineeringMedium

Gross and net calorific value of a fuel will be the same________?

AIf its ash content is zero

BIf its carbon content is very low

CUnder no circumstances

DIf its hydrogen/hydrogen compound content is zero

Correct answer

D. If its hydrogen/hydrogen compound content is zero

Explanation

The correct answer is If its hydrogen/hydrogen compound content is zero.

418Chemical EngineeringMedium

Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

AEither of A., B. or C.

BIncreasing the number of vanes in the impeller

CMounting of two or more impellers in series on a single shaft

DIncreasing the impeller speed and the volute area

Correct answer

C. Mounting of two or more impellers in series on a single shaft

Explanation

The correct answer is Mounting of two or more impellers in series on a single shaft.

419Chemical EngineeringMedium

Which one is not an induced draught furnace?

ABlast furnace stove

BNone of these

CHigh pressure boiler

DSintering furnace

Correct answer

A. Blast furnace stove

Explanation

The correct answer is Blast furnace stove.

420Chemical EngineeringMedium

Aqueous nitric acid is stored in________?

ACast iron vessel

BStainless steel vessel

CSteel drum

DCast iron vessel lined with acid-proof masonry brick

Correct answer

B. Stainless steel vessel

Explanation

The correct answer is Stainless steel vessel.

In a manufacturing industry, breakeven point occurs, when the________?

AAnnual sales equals the fixed cost

BAnnual profit equals the expected value

CTotal annual rate of production equals the assigned value

DTotal annual product cost equals the total annual sales

Correct answer

D. Total annual product cost equals the total annual sales

Explanation

The correct answer is Total annual product cost equals the total annual sales.

Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

AEither of A., B. or C.

BIncreasing the number of vanes in the impeller

CMounting of two or more impellers in series on a single shaft

DIncreasing the impeller speed and the volute area

Correct answer

C. Mounting of two or more impellers in series on a single shaft

Explanation

The correct answer is Mounting of two or more impellers in series on a single shaft.