MCQs

Chemical Engineering MCQs with Explanations

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3541Chemical EngineeringMedium

The function of moderators in nuclear reactor is to ________?

AControl the chain reaction

BSlow down the secondary neutrons

CAbsorb the secondary neutrons

DNone of these

Correct answer

B. Slow down the secondary neutrons

Explanation

The correct answer is Slow down the secondary neutrons.

3542Chemical EngineeringMedium

Uniform ramming of sand in green sand moulding process leads to________?

AReduced chance of gas porosity

BLess sand expansion type of casting defect

CGreater dimensional stability of the casting

DUniform flow of molten metal into the mould cavity

Correct answer

C. Greater dimensional stability of the casting

Explanation

The correct answer is Greater dimensional stability of the casting.

3543Chemical EngineeringMedium

Coke oven gas is a better fuel than blast furnace gas, because of its higher________?

AAdiabatic flame temperature

BHeat release rate (thus requiring smaller combustion chamber)

CCalorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

DAll A., B. and C.

Correct answer

D. All A., B. and C.

Explanation

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

3544Chemical EngineeringMedium

A minimum boiling azeotrope is exemplified by________?

AToluene-benzene

BWater-isobutyl alcohol

CNone of these

DAcetone-carbon disulphide

Correct answer

D. Acetone-carbon disulphide

Explanation

The correct answer is Acetone-carbon disulphide.

3545Chemical EngineeringMedium

The condition of diffraction from a crystal is given by________?

Anλ = 2d Sin θ

Bnλ = d Sin θ

Cλ = d Sin 2θ

Dλ = 2d Sin 2θ

Correct answer

A. nλ = 2d Sin θ

Explanation

The correct answer is nλ = 2d Sin θ.

3546Chemical EngineeringMedium

The commonly used solvent in supercritical extraction is________?

AWater

BMethyl ethyl ketone

CCarbon dioxide

DCarbon tetrachloride

Correct answer

C. Carbon dioxide

Explanation

The correct answer is Carbon dioxide.

3547Chemical EngineeringMedium

The ability of a material to offer resistance to scratching or indentation is a measure of its________?

AToughness

BHardness

CResilience

DBrittleness

Correct answer

B. Hardness

Explanation

The correct answer is Hardness.

3548Chemical EngineeringMedium

Caustic soda is transported in ________ lined containers?

AEither B. or C.

BNickel

CGlass

DNeoprene

Correct answer

A. Either B. or C.

Explanation

The correct answer is Either B. or C..

3549Chemical EngineeringMedium

For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature)?

AΔt2

BΔt3

CΔt

Correct answer

C. Δt

Explanation

The correct answer is Δt.

3550Chemical EngineeringMedium

For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams________?

ADecreases

BPasses through a maximum

CRemain unaffected

DIncreases

Correct answer

D. Increases

Explanation

The correct answer is Increases.

Uniform ramming of sand in green sand moulding process leads to________?

AReduced chance of gas porosity

BLess sand expansion type of casting defect

CGreater dimensional stability of the casting

DUniform flow of molten metal into the mould cavity

Correct answer

C. Greater dimensional stability of the casting

Explanation

The correct answer is Greater dimensional stability of the casting.