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Chemical Engineering MCQs with Explanations

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811Chemical EngineeringMedium

1.2 to 3.8 cms is the value of the ________?

ADowncomer liquid seal in case of a balanced tray design

BSkirt clearance for bubble caps

CAll A., B. and C.

DStatic submergence in case of a bubble cap tray for column operating under pressure (≥ 1 atm)

Correct answer

C. All A., B. and C.

Explanation

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

812Chemical EngineeringMedium

Prandtl number is a measure of the________?

AHeat conduction to viscosity of a fluid

BElastic force to pressure force in the fluid flow

CCp/Cv of a fluid

DInertial force to elastic force in the fluid flow

Correct answer

A. Heat conduction to viscosity of a fluid

Explanation

The correct answer is Heat conduction to viscosity of a fluid.

813Chemical EngineeringMedium

Enzymes belong to the category of________?

ACarbohydrates

BVitamins

CProteins

DFats

Correct answer

C. Proteins

Explanation

The correct answer is Proteins.

814Chemical EngineeringMedium

In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased?

AN2O4 ⇌ 2 NO2

BH2 + Cl2 ⇌ 2HCl

CH2 + I2 ⇌ 2HI

DN2 + O2 ⇌ 2NO

Correct answer

D. N2 + O2 ⇌ 2NO

Explanation

The correct answer is N2 + O2 ⇌ 2NO.

815Chemical EngineeringMedium

Which of the following processes cannot be made reversible even under ideal condition of operation?

AAll (A), B. & (C)

BCompression of air in a compressor

CExpansion of steam in a turbine

DFree expansion of a gas

Correct answer

D. Free expansion of a gas

Explanation

The correct answer is Free expansion of a gas.

816Chemical EngineeringMedium

Fatigue failure of a material may occur, when it is subjected to ________ stress?

ATensile

BFluctuating

CCompressive

DTorsion

Correct answer

B. Fluctuating

Explanation

The correct answer is Fluctuating.

817Chemical EngineeringMedium

Entropy change for an irreversible process taking system and surrounding together is________?

ANone of these

Correct answer

B. 0

Explanation

The correct answer is 0.

818Chemical EngineeringMedium

A gas shows deviation from ideal behaviour at________?

ALow pressure and low temperature

BLow temperature and high pressure

CLow pressure and high temperature

DHigh temperature and high pressure

Correct answer

B. Low temperature and high pressure

Explanation

The correct answer is Low temperature and high pressure.

819Chemical EngineeringMedium

Which of the following is not used as a medium for high temperature heating?

ADowtherm

BMercury

CFused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

DLiquid metal (e.g. molten sodium)

Correct answer

B. Mercury

Explanation

The correct answer is Mercury.

820Chemical EngineeringMedium

At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump?

A45° and 60°

B20° and 120°

C40° and 140°

D90° and 80°

Correct answer

C. 40° and 140°

Explanation

The correct answer is 40° and 140°.

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