MCQs

Chemical Engineering MCQs with Explanations

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1811Chemical EngineeringMedium

Clapeyron Equation deals with the________?

ATemperature dependence of heat of phase transition

BCalculation of ΔF for spontaneous phase change

CRate of change of vapour pressure with temperature

DEffect of an inert gas on vapour pressure

Correct answer

C. Rate of change of vapour pressure with temperature

Explanation

The correct answer is Rate of change of vapour pressure with temperature.

1812Chemical EngineeringMedium

The concentration of A in a first order reaction, A → B, decreases________?

ALogarithmically with time

BExponentially with time

CVery abruptly towards the end of the reaction

DLinearly with time

Correct answer

B. Exponentially with time

Explanation

The correct answer is Exponentially with time.

1813Chemical EngineeringMedium

At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the________?

ABuffer zone

BViscous sub-layer

CBoth A. and B.

DTurbulent core

Correct answer

B. Viscous sub-layer

Explanation

The correct answer is Viscous sub-layer.

1814Chemical EngineeringMedium

For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are________?

Ah2 < h1 < h3

Bh1 > h2 < h3

Correct answer

B. h1 > h2 < h3

Explanation

The correct answer is h1 > h2 < h3.

1815Chemical EngineeringMedium

Priming in a distillation column________?

AIs desirable from point efficiency consideration

BReduces the overall pressure drop

CIs characterised by the presence of foam throughout the space between trays

DResults from very low gas velocity

Correct answer

C. Is characterised by the presence of foam throughout the space between trays

Explanation

The correct answer is Is characterised by the presence of foam throughout the space between trays.

1816Chemical EngineeringMedium

One ‘Therm’ is equivalent to________?

A105 kcal

B105 BTU

C109 kcal

D109 BTU

Correct answer

B. 105 BTU

Explanation

The correct answer is 105 BTU.

1817Chemical EngineeringMedium

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around ________ percent?

A80 and 97

B40 and 70

C95 and 100

D25 and 97

Correct answer

A. 80 and 97

Explanation

The correct answer is 80 and 97.

1818Chemical EngineeringMedium

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces ________?

AHigher amount of both methane and hydrogen

BHigher amount of methane

CLower amount of hydrogen

DBoth A. and B.

Correct answer

D. Both A. and B.

Explanation

The correct answer is Both A. and B..

1819Chemical EngineeringMedium

Catalyst used in catalytic polymerisation which produces polymer gasoline is________?

AAlCl3

BBoth A. and B.

CH2SO4

DH3PO4

Correct answer

B. Both A. and B.

Explanation

The correct answer is Both A. and B..

1820Chemical EngineeringMedium

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________?

AIs a function of the liquid phase composition

BIs not dependent on the temperature

CMeasures the elevation in boiling point

DMeasures the depression in freezing point

Correct answer

A. Is a function of the liquid phase composition

Explanation

The correct answer is Is a function of the liquid phase composition.

Clapeyron Equation deals with the________?

ATemperature dependence of heat of phase transition

BCalculation of ΔF for spontaneous phase change

CRate of change of vapour pressure with temperature

DEffect of an inert gas on vapour pressure

Correct answer

C. Rate of change of vapour pressure with temperature

Explanation

The correct answer is Rate of change of vapour pressure with temperature.

Priming in a distillation column________?

AIs desirable from point efficiency consideration

BReduces the overall pressure drop

CIs characterised by the presence of foam throughout the space between trays

DResults from very low gas velocity

Correct answer

C. Is characterised by the presence of foam throughout the space between trays

Explanation

The correct answer is Is characterised by the presence of foam throughout the space between trays.

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________?

AIs a function of the liquid phase composition

BIs not dependent on the temperature

CMeasures the elevation in boiling point

DMeasures the depression in freezing point

Correct answer

A. Is a function of the liquid phase composition

Explanation

The correct answer is Is a function of the liquid phase composition.