chemical engineering MCQs – Page 144

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 Review each marked answer and report any item that may be outdated or unclear.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
2861. A typical example of an exothermic reversible reaction conducted at high pressure in industry is____________________?
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A. Dehydration of ethanol

B. Methanol synthesis

C. Polymerisation of ethylene

D. Reformation of methane

2862. For a _____________ order reaction, the units of rate constant and rate of reaction are the same ?
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A. Zero

B. Fractional

C. First

D. Second

2863. The order of a chemical reaction is__________________?
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A. Always equal to the total stoichiometric number of reactants

B. An experimentally determined quantity

C. Never fractional

D. None of these

2864. If the rate of a chemical reaction becomes slower at a given temperature, then the__________________?
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A. Entropy changes

B. Free energy of activation is lower

C. Initial concentration of the reactants remains constant

D. Free energy of activation is higher
2865. Find a mechanism that is consistent with the rate equation and reaction given below ?
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A. A + B ? AB; AB + A ? A2B

B. A + A ? AA; AA + B ? A2B

C. A + B ? AB; AB + A ? A2B

D. A + A ? AA; AA + B ? A2B

E. #NAME?

2866. Which of the following does not produce a change in the value of rate constant of a reaction ?
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A. Concentration and catalyst

B. None of these

C. Temperature

D. Pressure

2867. The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is _____________________ that of mixed reactor?
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A. Unpredictable from the data

B. Equal to

C. Greater than

D. Smaller than
2868. Which of the following factors control the design of a fluid-solid reactor ?
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A. Flow patterns of solids and fluid in the reactor

B. Reaction kinetics for single particle

C. All A., B. and C.

D. Size distribution of solids being treated

2869. A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant) ?
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A. None of these

B. ? 1/CA

C. ? CA

D. Independent of temperature

2870. For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?
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A. Ideal plug flow

B. Dead zone

C. Channelling

D. Bypass

2871. A plug-flow reactor is characterized by _____________________?
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A. High capacity

B. Constant composition and temperature of reaction mixture

C. Presence of axial mixing

D. Presence of lateral mixing
2872. Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is__________________?
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A. (atm)-1.(hr)-1

B. atm.(hr)-1

C. (atm)-1

D. (hr)-1

2873. For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?
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A. [CA0/(1 + ?A XA)] (dXA/dt) = k

B. ?A . ln (1 XA) = k . t

C. -ln(1 XA) = kt

D. XA = k . t

2874. For a zero order reaction, the concentration of product increases with the _____________________?
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A. Increase of reaction time

B. Total pressure

C. Increase in initial concentration

D. Decrease in total pressure

2875. Which of the following is not a unit of reaction rate ?
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A. Mole formed/volume of catalyst) (time)

B. Moles for med/(surface of catalyst) (time)

C. None of these

D. Moles formed/volume of reactor) (time)

2876. The conversion for a first order liquid phase reaction. A ? B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be_____________________?
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A. 75

B. 100

C. 60

D. 90

2877. In which of the following reactions, the equilibrium will shift to the right, if the total pressure is increased ?
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A. N2O4 ? 2 NO2

B. H2 + Cl2 ? 2HCl

C. H2 + I2 ? 2HI

D. N2 + O2 ? 2NO
2878. For the same residence time, which one will give the maximum conversion ?
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A. Single tubular flow reactor (v = 5 litres)

B. Single stirred tank (v = 5 litres)

C. Two stirred tank (each of 2.5 litres) in series

D. Stirred tank followed by tubular flow reactor (each of 2.5 litres)

2879. Effectiveness factor E. of a catalyst pellet is defined as, E = (actual rate within pore of the catalyst)/(rate if not snowed by pore diffusion), Effectiveness factor for a first order reaction is given by (where, T = Thiele modulus) ___________________?
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A. tan hT/T

B. None of these

C. tan hT/tan T

D. tan T/T

2880. The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between___________________?
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A. 7-10 %

B. 12-15 %

C. 20-25 %

D. 2-5 %