chemical engineering MCQs – Page 156

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
3101. Which of the following chemical reactions will be favoured by low pressure ?
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A. None of these

B. N2 + O2 ? 2NO

C. 2HI ? H2 + I2

D. N2O2 ? 2NO2
3102. Which of the following is a Naphthene ?
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A. Butene

B. Acetylene

C. Butadiene

D. Cyclohexane
3103. Reverse reaction in a chemical equilibrium is favoured by the________________?
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A. Increase in the concentration of one of the products

B. Removal of one of the products regularly

C. Increase in the concentration of one of the reactants

D. None of these

3104. Octane number (unleaded) of gasoline produced by isomerisation of butane may be about __________________?
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A. 70

B. 90

C. 55

D. 45

3105. If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chateliers principle)?
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A. Increases

B. Changes unpredictably

C. Remains unaltered

D. Decreases
3106. The role of a catalyst in a chemical reaction is to change the__________________?
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A. Equilibrium constant

B. Heat of reaction

C. Activation energy

D. Final products

3107. The fractional volume change of the system for the isothermal gas phase reaction, A ? 3B, between no conversion and complete conversion is___________________?
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A. 3

B. 0.5

C. 1

D. 2
3108. Butadiene is a/an_________________?
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A. Aromatic

B. Olefin

C. Di-olefin

D. Naphthene

3109. The performance of a cascade of CSTRs can be improved by adding__________________?
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A. More CSTRs in series

B. A P.F. reactor in series

C. A P.F. reactor in parallel

D. More CSTRs in parallel

3110. For nearly isothermal operation involving large reaction time in a liquid-phase reaction, the most suitable reactor is a _________________ reactor?
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A. Tubular flow

B. Stirred tank

C. Fixed bed

D. Batch

3111. Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
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A. Three

B. One

C. Zero

D. Two

3112. . In the converter of the contact process for the manufacture of H2SO4 the equilibrium conversion of SO2__________ (i) __________ with increase in temperature and __________ (ii) __________ with increase in the mole ratio of SO2 to air?
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A. (i) increases (ii) increases

B. (i) decreases (ii) increases

C. (i) increases (ii) decreases

D. (i) decreases (ii) decreases

3113. Molecular weight of crude petroleum may be around________________?
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A. 50

B. 1500

C. 5000

D. 250

3114. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled, then the equilibrium constant will________________?
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A. Remain the same

B. Also be doubled

C. Become one fourth

D. Be halved

3115. Preheating temperature of medium viscosity furnace oil for better atomisation through burner is about _______________ C ?
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A. 50

B. 70

C. 90

D. 140

3116. The rate of the heterogeneous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction is_______________?
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A. Surface reaction between absorbed A and absorbed B

B. Surface reaction between A in the gas phase and absorbed B

C. Absorption of A

D. Surface reaction between absorbed A and B in the gas phase
3117. The excess energy of the reactants required to dissociate into products is known as the ________________ energy?
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A. Threshold

B. Thermal

C. Activation

D. Binding

3118. Transition state theory gives the rate constant as__________________?
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A. K ? T . e-E/RT

B. K ? e-E/RT

C. K ? eE/RT

D. K ? ?T . e-E/RT

3119. In a chemical reaction, _____________________ are conserved?
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A. Ions

B. Masses

C. Atoms

D. Both B. & C.
3120. In catalytic cracking, the___________________?
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A. Gasoline obtained has a very low octane number

B. Pressure & temperature is very high

C. Gasoline obtained has very high amount of gum forming compounds

D. Gasoline obtained has very high aromatic content