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Chemical Engineering MCQs with Explanations

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221Chemical EngineeringMedium

The softest material just next to talc in the Mhos scale is________?

AFluorite

BFeldspar

CQuartz

DGypsum

Correct answer

D. Gypsum

Explanation

The correct answer is Gypsum.

222Chemical EngineeringMedium

Pig iron is produced by blast furnaces in India using mostly the iron ore named ________?

ASiderite

BMagnetite

CChalcopyrite

DHematite

Correct answer

D. Hematite

Explanation

The correct answer is Hematite.

223Chemical EngineeringMedium

A non-catalytic chemical reaction of the type as shown in the bellow figure is called a ________ reaction?

ANone of these

BParallel

CSeries

DSeries-parallel

Correct answer

D. Series-parallel

Explanation

The correct answer is Series-parallel.

224Chemical EngineeringMedium

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are?

ACobalt, zirconium & molybdenum

BCobalt, chromium & tungsten

CCobalt, chromium & nickel

DMolybdenum, tungsten & chromium

Correct answer

B. Cobalt, chromium & tungsten

Explanation

The correct answer is Cobalt, chromium & tungsten.

225Chemical EngineeringMedium

Orsat apparatus is meant for ________?

AFinding out combustion efficiency

BGravimetric analysis of flue gas

CNone of these

DDirect determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

Correct answer

C. None of these

Explanation

The correct answer is None of these.

226Chemical EngineeringMedium

The main purpose of recycling the byproduct hydrogen gas in the reformer reactor is to ________?

ASustain the reactor pressure

BObviate catalyst poisoning

CHydrogenate the feed stock

DMaintain the reaction temperature

Correct answer

A. Sustain the reactor pressure

Explanation

The correct answer is Sustain the reactor pressure.

227Chemical EngineeringMedium

A pyranometer is an instrument used for measuring the________?

ABeam radiation

BNone of these

CBright sunshine period

DGlobal radiation

Correct answer

D. Global radiation

Explanation

The correct answer is Global radiation.

228Chemical EngineeringMedium

If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).?

AQ = Q1 + Q2 + Q3

BV1 = V2 = V3

Cf = f1 + f2 + f3

DQ1 = Q2 = Q3

Correct answer

A. Q = Q1 + Q2 + Q3

Explanation

The correct answer is Q = Q1 + Q2 + Q3.

229Chemical EngineeringMedium

Pick out the wrong statement?

ADue to uneven supply and improper distribution of liquid, problem of channelling, loading &

BPacked towers are preferred over plate towers for handling corrosive and foamy liquids

CPacked towers are preferred for vacuum operation, because the pressure drop through the

DDiameter of randomly packed tower is normally more than 1.2 metres

Correct answer

D. Diameter of randomly packed tower is normally more than 1.2 metres

Explanation

The correct answer is Diameter of randomly packed tower is normally more than 1.2 metres.

230Chemical EngineeringMedium

At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.)?

Aμ° + T ln f

Bμ°+ R ln f

Cμ° + R/T ln f

Dμ° + RT ln f

Correct answer

D. μ° + RT ln f

Explanation

The correct answer is μ° + RT ln f.

Pick out the wrong statement?

ADue to uneven supply and improper distribution of liquid, problem of channelling, loading &

BPacked towers are preferred over plate towers for handling corrosive and foamy liquids

CPacked towers are preferred for vacuum operation, because the pressure drop through the

DDiameter of randomly packed tower is normally more than 1.2 metres

Correct answer

D. Diameter of randomly packed tower is normally more than 1.2 metres

Explanation

The correct answer is Diameter of randomly packed tower is normally more than 1.2 metres.