chemical engineering MCQs – Page 149

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 Review each marked answer and report any item that may be outdated or unclear.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

2961. _____________ gas is normally employed in B.E.T. method of finding out the surface area of catalyst?
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A. N2

B. H2

C. CO2

D. He

2962. ______________ explains the mechanism of catalysis?
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A. None of these

B. Collision theory

C. Activated complex theory

D. Thermodynamics

2963. The rate of the chemical reaction A ? B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CA n, then what is the value of n for this reaction ?
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A. 1

B. 0

C. 0.5

D. 2

2964. A chemical reaction, A ? 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is ___________________?
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A. 1

B. Data insufficient, cant be predicted

C. 0.5

D. 0.33

2965. The irreversible reaction is a special case of reversible reaction, if the________________?
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A. Conversion of the reactant at equilibrium condition is zero

B. Reactant concentration at equilibrium condition is zero

C. Equilibrium constant is 1

D. All A., B. and C.

2966. Which of the following is a characteristic of an ideal plug flow reactor ?
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A. Flat velocity profile

B. Axial dispersion

C. Uniform mixing

D. None of these

2967. Batch process is preferred over continuous process, when the___________________?
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A. Same equipment cannot be used for several processes of the same nature

B. idence time

C. Product yields and quality cannot be achieved in continuous process, because of long

D. All A., B. & C.

E. Sales demand of product is not steady

2968. For a tubular flow reactor with uniform concentration and temperature, the independent variable is___________________?
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A. Diameter

B. None of these

C. Length

D. Time

2969. Velocity of a chemical reaction___________________?
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A. Decreases with increase in temperature

B. None of these

C. Increases with increase of pressure of reactants for all reactions

D. Decreases with increase of reactant concentration

2970. B.E.T. method of finding out surface area of a catalyst, uses the extension of _________________ isotherm?
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A. None of these

B. Freundlich

C. Langmuir

D. Tempkin

2971. The reaction in which one of the products of reaction acts as a catalyst is called a/an ______________ reaction?
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A. Catalytic

B. Photochemical

C. Biochemical

D. Autocatalytic

2972. A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?
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A. Equal to or more than

B. More than

C. Less than

D. Equal to

2973. The preferred reacting system for oxidation of o-xylene to phthalic anhydride is _____________________?
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A. Jacketed liquid phase CSTR

B. Multistage multitubular reactor with interstage cooling

C. Multitubular reactor with cooling

D. Jacketed steam heated multitubular reactor

2974. The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a tanks in series model comprising of m tanks is equal to ___________________?
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A. m

B. 1/m

C. ?m

D. m2

2975. The increase in the rate of reaction with temperature is due to__________________?
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A. Decrease in activation energy

B. None of these

C. Increase in the average kinetic energy of the reacting molecules

D. Increase in the number of effective collisions

2976. For a homogeneous reaction of nth order, the dimension of the rate constant is given by_________________?
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A. (Concentration)1 n/(time)

B. (Concentration)n 1/(time)

C. 1/(time)n

D. None of these

2977. Most important characteristics of gas-liquid reactors are the________________?
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A. Specific inter-facial area

B. Liquid hold-up

C. Both A. and B.

D. None of these

2978. A non-catalytic chemical reaction of the type as shown in the bellow figure is called a _____________ reaction?
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A. Series

B. None of these

C. Parallel

D. Series-parallel

2979. A space velocity of 5 hr-1 means that ___________________?
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A. After every 5 hours, reactor is being filled with the feed

B. A fixed conversion of a given batch of feed takes 5 hours

C. Cent per cent conversion can be achieved in at least 5 hours

D. Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour

2980. When a catalyst increases the rate of chemical reaction, the rate constant_____________________?
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A. Remain constant

B. Become infinite

C. Decreases

D. Increases

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