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Chemical Engineering MCQs with Explanations

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171Chemical EngineeringMedium

A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpm Head = 8 metres Flow = 1000 litres/minutes. If its speed is halved, the new discharge will be ________ litres/minute?

A750

B500

C200

D1000

Correct answer

B. 500

Explanation

The correct answer is 500.

172Chemical EngineeringMedium

Pick out the wrong statement?

APolymers made of more than one monomer is called copolymer or mixed polymer

BVulcanised rubber is more elastic than natural rubber

CThe intermolecular forces in thermoplastic polymers are intermediate to that of elastomers &

DPolymers made of only one monomer is called homopolymer

Correct answer

D. Polymers made of only one monomer is called homopolymer

Explanation

The correct answer is Polymers made of only one monomer is called homopolymer.

173Chemical EngineeringMedium

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

AAu-198

BI-131

CRa-226

DSr-90

Correct answer

C. Ra-226

Explanation

The correct answer is Ra-226.

174Chemical EngineeringMedium

Salt content (measured as sodium chloride) in electrically desalted crude oil comes down to a level of about ________ ptb (pounds per thousand barrel)?

A70

B0.03

D35

Correct answer

C. 3

Explanation

The correct answer is 3.

175Chemical EngineeringMedium

Neoprene is rendered non-inflammable, because of________?

AIts linear chain structure

BThe presence of chlorine atoms in its monomer

CIts cross-linked structure

DThe absence of chlorine atoms in its monomer

Correct answer

B. The presence of chlorine atoms in its monomer

Explanation

The correct answer is The presence of chlorine atoms in its monomer.

176Chemical EngineeringMedium

Heat transfer occurs by natural convection because change in temperature causes difference in________?

AViscosity

BThermal conductivity

CDensity

DHeat capacity

Correct answer

C. Density

Explanation

The correct answer is Density.

177Chemical EngineeringMedium

Fouling factor________?

AAccounts for additional resistances to heat flow

BIs a dimensionless quantity

CNone of these

DDoes not provide a safety factor for design

Correct answer

A. Accounts for additional resistances to heat flow

Explanation

The correct answer is Accounts for additional resistances to heat flow.

178Chemical EngineeringMedium

Shatter index of the coke is a measure of its________?

ABulk density

BNone of these

CStrength

DReactivity

Correct answer

C. Strength

Explanation

The correct answer is Strength.

179Chemical EngineeringMedium

An ideal nozzle design aims at________?

ABoth A. & B.

BMinimising wall friction

CSuppressing boundary layer separation

DNeither A. nor B.

Correct answer

A. Both A. & B.

Explanation

The correct answer is Both A. & B..

180Chemical EngineeringMedium

Molecular weight of crude petroleum may be around________?

A5000

B50

C1500

D250

Correct answer

C. 1500

Explanation

The correct answer is 1500.

Pick out the wrong statement?

APolymers made of more than one monomer is called copolymer or mixed polymer

BVulcanised rubber is more elastic than natural rubber

CThe intermolecular forces in thermoplastic polymers are intermediate to that of elastomers &

DPolymers made of only one monomer is called homopolymer

Correct answer

D. Polymers made of only one monomer is called homopolymer

Explanation

The correct answer is Polymers made of only one monomer is called homopolymer.