MCQs

Chemical Engineering MCQs with Explanations

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2771Chemical EngineeringMedium

The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by________?

AdXA/dt = k1 (1 – XA)/(1 + XA)

BdXA/dt = k1 (1 – XA)

CdXA/dt = k1 (1 – XA)2 (1 + 2XA)

DdXA/dt = k1 (1 – XA) (1 + 0.5XA)

Correct answer

B. dXA/dt = k1 (1 – XA)

Explanation

The correct answer is dXA/dt = k1 (1 – XA).

2772Chemical EngineeringMedium

The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are________?

A9.03 × 1024

B6.02 × 1023

C1.20 × 1024

D3.01 × 1022

Correct answer

A. 9.03 × 1024

Explanation

The correct answer is 9.03 × 1024.

2773Chemical EngineeringMedium

Preheating of ________ the flame temperature?

AEither the fuel or the air or both, increases

BCombustion air decreases

CEither the fuel or the air does not affect

DThe gaseous fuel before combustion decreases

Correct answer

A. Either the fuel or the air or both, increases

Explanation

The correct answer is Either the fuel or the air or both, increases.

2774Chemical EngineeringMedium

Thorium is mainly used ________?

AIn the manufacture of hydrogen bomb

BAs a fissile fuel in a nuclear reactor

CFor the manufacture of gas mantles

DIn the treatment of cancer

Correct answer

C. For the manufacture of gas mantles

Explanation

The correct answer is For the manufacture of gas mantles.

2775Chemical EngineeringMedium

The interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emissivities εx & εy is given by________?

A1/εx + 1/εy

B(εx + εy)/( εx + εy – εx. εy)

Cεx + εy

Correct answer

B. (εx + εy)/( εx + εy – εx. εy)

Explanation

The correct answer is (εx + εy)/( εx + εy – εx. εy).

2776Chemical EngineeringMedium

Vibrations in the tubes of a shell and tube heat exchanger is induced due to the ________?

AAll A., B. and C.

BVibrations transmitted through piping and/or supports due to external reasons

CFlow of fluid on the tube and shell sides

DOscillations in the flow of shell/tube sides fluid

Correct answer

A. All A., B. and C.

Explanation

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

2777Chemical EngineeringMedium

Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove________?

ATurbidity

BAll A, B. and C.

CBacteria

DColour

Correct answer

B. All A, B. and C.

Explanation

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

2778Chemical EngineeringMedium

Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________?

AGas retorts

BGlass melting furnace

CPottery furnace

DCrucibles

Correct answer

A. Gas retorts

Explanation

The correct answer is Gas retorts.

2779Chemical EngineeringMedium

Which of the following comprises of hydrocarbons?

AMica flakes

BRubber

CNone of these

DGlass

Correct answer

B. Rubber

Explanation

The correct answer is Rubber.

2780Chemical EngineeringMedium

The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by________?

A(∂H/∂ni)S, P, nj

BAll (A), B. and (C)

C(∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj

D(∂E/∂ni)S, v, nj

Correct answer

B. All (A), B. and (C)

Explanation

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

Preheating of ________ the flame temperature?

AEither the fuel or the air or both, increases

BCombustion air decreases

CEither the fuel or the air does not affect

DThe gaseous fuel before combustion decreases

Correct answer

A. Either the fuel or the air or both, increases

Explanation

The correct answer is Either the fuel or the air or both, increases.