Chemical Reaction Engineering MCQ Questions & Answers

81

For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate -r_A₀ is invariant with total pressure. The rate controlling step is

A) Surface $$\frac{{{{\text{K}}_{\text{C}}}}}{{1 + {{\text{T}}_{\text{S}}}}}$$ reaction between absorbed A and B in the gas phase B) Surface reaction between absorbed A and absorbed B C) Surface reaction between A in the gas phase and absorbed B D) Desorption of C

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Answer: Option D

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82

In an ideal P.F.R. at steady state conditions

A) The composition of reactants remains constant along a flow path B) The conversion of the reactant varies from point to point along a flow path C) There is no lateral mixing of fluid D) There may be diffusion along the flow path

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Answer: Option B

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83

Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is $$\frac{{{{\text{r}}_{\text{R}}}}}{{{{\text{r}}_{\text{S}}}}} = \frac{{{{\text{k}}_1}}}{{{{\text{k}}_2}}} \cdot {{\text{C}}_{\text{A}}}^{{\text{a}} - {\text{b}}}$$

A) Use high pressure and eliminate inerts, when a > b B) Avoid recycle, when a > b C) Use batch reactor or plug flow reactor, when a > b D) Use CSTR with a high conversion, when a > b

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Answer: Option B

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84

The value of steric factor 'P' in the equation $${\text{k}} = {\text{PZ}}{{\text{e}}^{\frac{{\text{E}}}{{{\text{RT}}}}}}$$ usually ranges from

A) L.0 to 10^-8 B) L.l. to 10² C) 0.1 to 0.9 D) None of these

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Answer: Option A

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85

Helium-mercury method can be used to determine the __________ of the catalyst particle.

A) Pore volume B) Solid density C) Porosity D) All of the above

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Answer: Option D

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86

An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.

A) Is always equal to B) Is always greater than C) Is always less than D) May be greater or less than

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Answer: Option B

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87

Bulk diffusion in catalyst pore __________ with increase in pressure.

A) Increases B) Decreases C) Remains unchanged D) Increases exponentially

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Answer: Option B

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88

Chemical kinetics can predict the __________ of a chemical reaction.

A) Rate B) Feasibility C) Both A & B D) Neither A nor B

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Answer: Option A

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89

The size of plug flow reactor (PFR) for all positive reaction orders and for any given duty, is __________ that of mixed reactor.

A) Greater than B) Equal to C) Smaller than D) Unpredictable from the data

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Answer: Option C

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90

B.E.T. method can be used to determine the __________ of a porous catalyst.

A) Solid density B) Pore volume C) Surface area D) All of the above

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Answer: Option C

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering