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Chemical Engineering MCQs with Explanations

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161Chemical EngineeringMedium

Steam distillation is not recommended to be used, if the ________?

AMaterial cannot be distilled by indirect heating even under low pressure, because of the high

BAzeotropic mixture is to be separated and the final product is miscible with water

CMaterial to be distilled is thermally unstable or has the tendency to react with other

DLiquids decompose, if distilled directly at atmospheric pressure

Correct answer

B. Azeotropic mixture is to be separated and the final product is miscible with water

Explanation

The correct answer is Azeotropic mixture is to be separated and the final product is miscible with water.

162Chemical EngineeringMedium

Vetrocoke solution is________?

AK2SO4

BA mixture of Na2CO3 and As2O3

CA mixture of K2CO3 and As2O3

DNa2SO4

Correct answer

C. A mixture of K2CO3 and As2O3

Explanation

The correct answer is A mixture of K2CO3 and As2O3.

163Chemical EngineeringMedium

A refrigerator may be termed as a________?

AHeat pump

BCarnot engine

CHeat engine

DNone of these

Correct answer

A. Heat pump

Explanation

The correct answer is Heat pump.

164Chemical EngineeringMedium

The emission of an a-particle causes the resultant nucleus to have________?

AMore atomic weight and less atomic number

BLess atomic weight and more atomic number

CNone of these

DLess atomic weight and less atomic number

Correct answer

A. More atomic weight and less atomic number

Explanation

The correct answer is More atomic weight and less atomic number.

165Chemical EngineeringMedium

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is?

AEqual

BUnpredictable

CLess

DMore

Correct answer

C. Less

Explanation

The correct answer is Less.

166Chemical EngineeringMedium

Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in________?

ASame COP

BDecreased COP

CIncreased COP

DIncreased or decreased COP; depending upon the type of refrigerant

Correct answer

C. Increased COP

Explanation

The correct answer is Increased COP.

167Chemical EngineeringMedium

Critical value of the ________ number governs the transition from laminar to turbulent flow in free convection heat transfer?

AReynolds

BGrashoff

CBoth ‘a’ & ‘b’

DPrandtl & Grashoff

Correct answer

D. Prandtl & Grashoff

Explanation

The correct answer is Prandtl & Grashoff.

168Chemical EngineeringMedium

Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flowmeters, because their ________ is very low/small?

AElectrical resistivity

BElectrical conductivity

CThermal conductivity

DSpecific gravity

Correct answer

B. Electrical conductivity

Explanation

The correct answer is Electrical conductivity.

169Chemical EngineeringMedium

A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is________?

A45°

B-180°

C-90°

Correct answer

A. 45°

Explanation

The correct answer is 45°.

170Chemical EngineeringMedium

The order of a chemical reaction________?

ACan be determined only experimentally

BCannot be zero

CCan be fractional

DCan be determined from the stoichiometry of the reaction

Correct answer

D. Can be determined from the stoichiometry of the reaction

Explanation

The correct answer is Can be determined from the stoichiometry of the reaction.

Steam distillation is not recommended to be used, if the ________?

AMaterial cannot be distilled by indirect heating even under low pressure, because of the high

BAzeotropic mixture is to be separated and the final product is miscible with water

CMaterial to be distilled is thermally unstable or has the tendency to react with other

DLiquids decompose, if distilled directly at atmospheric pressure

Correct answer

B. Azeotropic mixture is to be separated and the final product is miscible with water

Explanation

The correct answer is Azeotropic mixture is to be separated and the final product is miscible with water.