chemical engineering MCQs – Page 146

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 Review each marked answer and report any item that may be outdated or unclear.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

2901. The catalyst in a first order chemical reaction changes the_________________?
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A. Heat of reaction

B. Heat of formation of the product

C. Activation energy

D. Equilibrium constant

2902. For series reaction, the relative yield__________________?
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A. Is always greater for plug-flow reactor than for the single CSTR of the same volume

B. Statement in A. is wrong

C. Decreases with increasing conversion

D. Both A. and C. hold good

2903. The exit age distribution of fluid leaving a vessel is used to know the__________________?
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A. Activation energies of a reaction

B. None of these

C. Extent of non-ideal flow in the vessel

D. Reaction mechanism

2904. Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor ?
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A. Very low temperature should be used throughout the reaction

B. Very high temperature should be used throughout the reaction

C. None of these

D. Temperature should be high in the beginning and decreased towards the end of the reaction

2905. With the same reaction time, initial concentration and feed rate, the reaction 2A ? B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?
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A. Higher in P.F. reactor

B. Higher in CSTR

C. Same in both the reactors

D. Data insufficient; cant be predicted

2906. The equilibrium constant K of a chemical reaction depends on_________________?
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A. Ratio of reactants

B. Temperature only

C. Pressure only

D. Temperature and pressure

2907. In a continuous flow stirred tank reactor, the composition of the exit stream_________________?
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A. Is same as that in the reactor

B. Depends upon the flow rate of inlet stream

C. Is different than that in the reactor

D. None of these

2908. A space time of 3 hours for a flow reactor means that___________________?
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A. ours</strong>

B. Conversion is cent per cent after three hours

C. It takes three hours to dump the entire volume of the reactor with feed

D. Three reactor volumes of feed can be processed every hour

E. The time required to process one reactor volume of feed (measured at specified conditions) is

2909. For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?
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A. PFR of volume V/X

B. CSTR of volume V/X

C. PFR of volume V

D. CSTR of volume V

2910. Unreacted core model represents the reaction involving ______________________?
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A. None of these

B. Roasting of sulphide ores

C. Combustion of coal particles

D. Manufacture of carbon disulphide from elements

2911. In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 ? C6H6 + CH4 2C6H6 ? C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is_______________________?
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A. 0.16

B. 0.152

C. 0.144

D. 0.136

2912. The rate constant of a reaction is a function of the ___________________?
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A. Initial concentration of the reactants

B. Temperature of the system

C. Time of reaction

D. Extent of reaction

2913. In which of the following gaseous phase reactions, the equilibrium of the reaction remains unaffected by pressure changes ?
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A. 2SO2 + O2 ? 2SO3

B. 2NO2 ? N2O4

C. N2 + O2 ? 2NO

D. 2O3 ? 3O2

2914. Chemical kinetics can predict the _______________ of a chemical reaction?
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A. Rate

B. Feasibility

C. Both A. & B.

D. Neither A. nor B.

2915. A reaction which is catalysed by a base is catalysed by all substances which have a tendency to_______________________?
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A. None of these

B. Gain an electron

C. Gain a proton

D. Lose a proton

2916. The reaction between oxygen and organic material is a/an _____________ reaction?
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A. Photochemical

B. Exothermic

C. Biochemical

D. Endothermic

2917. 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________________?
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A. dXA/dt = k1 (1 XA)/(1 + XA)

B. dXA/dt = k1 (1 XA) (1 + 0.5XA)

C. dXA/dt = k1 (1 XA)

D. dXA/dt = k1 (1 XA)2 (1 + 2XA)

2918. The effectiveness factor for large value of Thiele modulus [L?(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?
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A. ?

B. L ?(K/D1)

C. 1/[L?(K/D1)]

D. 1

2919. Differential method for analysing the kinetic data is used ___________________?
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A. When rate expressions are very simple

B. For testing complicated mechanisms

C. None of these

D. When the data are scattered

2920. In autocatalytic reactions ?
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A. No catalyst is used

B. One of the products acts as a catalyst

C. Catalysts have very high selectivity

D. One of the reactants acts as a catalyst

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