MCQs

Chemical Engineering MCQs with Explanations

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3381Chemical EngineeringMedium

Air used in aerobic fermentation must be sterilized, otherwise the ________?

ARecovery of product will be difficult

BNone of these

CUniformity of product cannot be achieved

DContamination of pure culture would result

Correct answer

D. Contamination of pure culture would result

Explanation

The correct answer is Contamination of pure culture would result.

3382Chemical EngineeringMedium

Which of the following is not a common refrigerant?

ACarbon dioxide

BAmmonia

CFreon-12

DEthylene

Correct answer

D. Ethylene

Explanation

The correct answer is Ethylene.

3383Chemical EngineeringMedium

Branched chair polymers as compared to linear polymers have ________?

AHigher tensile strength

BLower density

CNone of these

DHigher melting point

Correct answer

B. Lower density

Explanation

The correct answer is Lower density.

3384Chemical EngineeringMedium

The heat of combustion of a fuel________?

AIs always negative

BIs always positive

CCan’t be known without calculating it

DIs equal to the heat of formation

Correct answer

A. Is always negative

Explanation

The correct answer is Is always negative.

3385Chemical EngineeringMedium

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when________?

AOne of the liquid components is heat sensitive

BExtracting solvent is cheaply & abundantly available

COne of the liquid components has very high affinity towards the solvent

DViscosity of liquid components is very high

Correct answer

C. One of the liquid components has very high affinity towards the solvent

Explanation

The correct answer is One of the liquid components has very high affinity towards the solvent.

3386Chemical EngineeringMedium

Which is the stable form of silica between 1470°C and the melting point 1713°C?

ANone of these

BTridymite

CQuartz

DCristobalite

Correct answer

D. Cristobalite

Explanation

The correct answer is Cristobalite.

3387Chemical EngineeringMedium

Pick out the wrong statement?

ACarbon refractories cannot be used in the furnaces operating under reducing conditions

BSilica occurs in nature in all cellular, amorphous or crystalline form

CMullite can be obtained by the heating of alusite, kyanite or sillimanite

DSand & coke is the main raw material for the manufacture of silicon carbide

Correct answer

A. Carbon refractories cannot be used in the furnaces operating under reducing conditions

Explanation

The correct answer is Carbon refractories cannot be used in the furnaces operating under reducing conditions.

3388Chemical EngineeringMedium

Carbon tetrachloride can be stored in a storage vessel made of________?

ATin

BHigh silicon iron (14% Si)

CStainless steel

DAll A., B. and C.

Correct answer

D. All A., B. and C.

Explanation

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

3389Chemical EngineeringMedium

Feed size of ≥ 25 cms can be accepted by ________?

ARod mill

BJaw crusher

CBall mill

DFluid energy mill

Correct answer

B. Jaw crusher

Explanation

The correct answer is Jaw crusher.

3390Chemical EngineeringMedium

Heat balance of furnace provides means of determining the________?

ASources of heat losses

BAll A., B. and C.

CScope of reduction of heat losses

DThermal efficiency of the process

Correct answer

B. All A., B. and C.

Explanation

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

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when________?

AOne of the liquid components is heat sensitive

BExtracting solvent is cheaply & abundantly available

COne of the liquid components has very high affinity towards the solvent

DViscosity of liquid components is very high

Correct answer

C. One of the liquid components has very high affinity towards the solvent

Explanation

The correct answer is One of the liquid components has very high affinity towards the solvent.

Pick out the wrong statement?

ACarbon refractories cannot be used in the furnaces operating under reducing conditions

BSilica occurs in nature in all cellular, amorphous or crystalline form

CMullite can be obtained by the heating of alusite, kyanite or sillimanite

DSand & coke is the main raw material for the manufacture of silicon carbide

Correct answer

A. Carbon refractories cannot be used in the furnaces operating under reducing conditions

Explanation

The correct answer is Carbon refractories cannot be used in the furnaces operating under reducing conditions.