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Chemical Engineering MCQs with Explanations

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1111Chemical EngineeringMedium

Pick out the correct statement pertaining to the flow through a converging-diverging tube?

None of these

BNo shock wave develops in the tube when the Mach number at exit is greater than unity

CThroughout the converging portion of the tube, the density increases in the downstream

DThe value of Mach number is always unity at the throat

Correct answer

B. No shock wave develops in the tube when the Mach number at exit is greater than unity

Explanation

The correct answer is No shock wave develops in the tube when the Mach number at exit is greater than unity.

1112Chemical EngineeringMedium

Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________?

A(T1 – T2)/T2

B(T1 – T2)/T1

C(T2 – T1)/T1

D(T2 – T1)/T2

Correct answer

D. (T2 – T1)/T2

Explanation

The correct answer is (T2 – T1)/T2.

1113Chemical EngineeringMedium

Cylindrical shell thickness of rotary drier is generally ________ mm?

A18-22

B2-3

C6-8

D12-15

Correct answer

C. 6-8

Explanation

The correct answer is 6-8.

1114Chemical EngineeringMedium

The heat capacity of most substances is greater for the ________ state?

AGaseous

BLiquid

CSolid

DNone of these

Correct answer

B. Liquid

Explanation

The correct answer is Liquid.

1115Chemical EngineeringMedium

Scaling of furnace stock is reduced by ________ in flue gas?

AHigh CO/CO2

BCO

CH2

DAll A., B. & C.

Correct answer

D. All A., B. & C.

Explanation

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

1116Chemical EngineeringMedium

Which of the following is the largest quantum of pressure?

A1 kilo Pascal

B1 bar

C1 kg/cm2

D1 atmosphere

Correct answer

D. 1 atmosphere

Explanation

The correct answer is 1 atmosphere.

1117Chemical EngineeringMedium

The velocity profile exhibited by laminar flow of Newtonian fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an ________ with the apex at the centre line of the pipe?

ASemi-circle

BParabola

CSemi-ellipse

DHyperbola

Correct answer

B. Parabola

Explanation

The correct answer is Parabola.

1118Chemical EngineeringMedium

Pick out the wrong statement?

AFluxing material like lime is added in clay to reduce the vitrification temperature

BVitrification of fireclay material is done to increase its porosity

CAddition of sand in ceramic materials makes it non-plastic, increases its fusion point and

DMain constituents of clay are alumina and silica

Correct answer

B. Vitrification of fireclay material is done to increase its porosity

Explanation

The correct answer is Vitrification of fireclay material is done to increase its porosity.

1119Chemical EngineeringMedium

Stamp mills are generally used for crushing________?

ATalc

BGold ores

CDiamond

DIron ores

Correct answer

B. Gold ores

Explanation

The correct answer is Gold ores.

1120Chemical EngineeringMedium

Which of the following does not have a sharp melting point?

APig iron

BIce

CGlass

DThoria

Correct answer

C. Glass

Explanation

The correct answer is Glass.

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