MCQs

Chemical Engineering MCQs with Explanations

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3481Chemical EngineeringMedium

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is________?

AInfinity

BPositive

CZero

DNegative

Correct answer

C. Zero

Explanation

The correct answer is Zero.

3482Chemical EngineeringMedium

Capacity of a rotary gear pump can be varied by________?

AChanging the speed of rotation

BAll A., B. and C.

CBleeding air into suction

DBypassing liquid from the suction or discharge line

Correct answer

B. All A., B. and C.

Explanation

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

3483Chemical EngineeringMedium

Corrosion is________?

AA chemical phenomenon

BA physical phenomenon

CSame as erosion

DAn uncontrollable phenomenon

Correct answer

A. A chemical phenomenon

Explanation

The correct answer is A chemical phenomenon.

3484Chemical EngineeringMedium

Plasticisers are added to synthetic plastics to ________?

AImpart flexibility

BImprove workability during fabrication

CAll A., B. and C.

DDevelop new improved properties not present in the original resin

Correct answer

C. All A., B. and C.

Explanation

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

3485Chemical EngineeringMedium

What is the order of chemical reaction as shown in the bellow figure, if it is found that the reaction rate doubles on doubling the concentration of B and also the reaction rate doubles when the concentrations of both A & B were doubled and quadrupled when the concentrations of both B & C were doubled?

Correct answer

A. 2

Explanation

The correct answer is 2.

3486Chemical EngineeringMedium

The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by________?

A2x

C4x

Correct answer

B. x

Explanation

The correct answer is x.

3487Chemical EngineeringMedium

Liquid nitrogen containers can be made from ________?

AHSLA steel

BTitanium

CAustenitic stainless steel

DFerritic stainless steel

Correct answer

A. HSLA steel

Explanation

The correct answer is HSLA steel.

3488Chemical EngineeringMedium

An increase in the NH3/CO2 ratio in urea manufacture results in________?

ADecreased yield of urea

BDecreased specific volume of molten mass

CDecreased degree of conversion of NH3 to urea

DIncreased degree of conversion of CO2 to urea

Correct answer

D. Increased degree of conversion of CO2 to urea

Explanation

The correct answer is Increased degree of conversion of CO2 to urea.

3489Chemical EngineeringMedium

Cumulative analysis for determining surface is more precise than differential analysis, because of the________?

AAssumption that all particles in a single fraction are equal in size

BNone of these

CAssumption that all particles in a single fraction are equal in size, is not needed

DFact that screening is more effective

Correct answer

C. Assumption that all particles in a single fraction are equal in size, is not needed

Explanation

The correct answer is Assumption that all particles in a single fraction are equal in size, is not needed.

3490Chemical EngineeringMedium

Eutectoid composition of carbon steel at room temperature is________?

AMartensite

BPearlite

CFerrite

DCementite

Correct answer

B. Pearlite

Explanation

The correct answer is Pearlite.

An increase in the NH3/CO2 ratio in urea manufacture results in________?

ADecreased yield of urea

BDecreased specific volume of molten mass

CDecreased degree of conversion of NH3 to urea

DIncreased degree of conversion of CO2 to urea

Correct answer

D. Increased degree of conversion of CO2 to urea

Explanation

The correct answer is Increased degree of conversion of CO2 to urea.

Cumulative analysis for determining surface is more precise than differential analysis, because of the________?

AAssumption that all particles in a single fraction are equal in size

BNone of these

CAssumption that all particles in a single fraction are equal in size, is not needed

DFact that screening is more effective

Correct answer

C. Assumption that all particles in a single fraction are equal in size, is not needed

Explanation

The correct answer is Assumption that all particles in a single fraction are equal in size, is not needed.