Chemical Reaction Engineering MCQ Questions & Answers

91

Pick out the wrong statement.

A) Exit age description function (E) and internal age distribution function ($$I$$) are related as, $$E = - \frac{{{\text{d}}I}}{{{\text{d}}\theta }}$$ B) Chmisorption studies are useful in the determination of catalyst surface area and pore size distribution C) A higher temperature favours the reaction of higher activation energy D) A catalyst increases the potential energy barrier over which the reactants must pass to form products

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Answer & Solution

Answer: Option D

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92

The effectiveness factor for large value of Thiele modulus $${\text{L}}\sqrt {{\text{K}}/{{\text{D}}_1}} $$ of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D₁ = diffusion co-efficient, cm²/second)

A) $${\text{L}}\sqrt {{\text{K}}/{{\text{D}}_1}} $$ B) $$\frac{1}{{{\text{L}}\sqrt {{\text{K}}/{{\text{D}}_1}} }}$$ C) 1 D) $$\infty $$

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Answer & Solution

Answer: Option B

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93

The performance equations for constant density systems are identical for

A) P.F.R. and backmix reactor B) P.F.R. and batch reactor C) P.F.R, batch reactor and backmix reactor D) Batch reactor and backmix reactor

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Answer & Solution

Answer: Option B

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94

During manufacture of H₂SO₄, the oxidation of SO₂ to SO₃ by oxygen is an en-dothermic reaction. The yield of SO₃ will be maximised, if the

A) Temperature is increased B) Pressure is reduced C) Temperature is increased and pressure is reduced D) Temperature is reduced and pressure is increased

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Answer & Solution

Answer: Option D

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95

__________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.

A) Gas film diffusion B) Ash diffusion C) Chemical reaction D) None of these

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Answer & Solution

Answer: Option C

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96

Space time in flow reactor is

A) Usually equal to the residence time B) The reciprocal of the space velocity C) A measure of its capacity D) Both A and B

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Answer & Solution

Answer: Option D

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97

Space velocity

A) Describes the extensive operating characteristics of a tubular flow reactor B) Is the maximum feed rate pre unit volume of reactor for a given conversion C) Is a measure of the ease of the reaction D) All of the above

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Answer & Solution

Answer: Option D

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98

The residence time distribution of an ideal CSTR is

A) 1/τ exp (-t/τ) B) Τ exp (-t/τ) C) Exp(-t/τ) D) 1/τ (-t/τ)

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Answer & Solution

Answer: Option C

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99

To maximise the formation of R in the simultaneous reaction
A + B → R , r_R = 2C_A^0.5.C_B²
A + B → S , r_S = 1.5 C_A.C_B
We should have

A) Low C_A, low C_B B) Low C_A, high C_B C) High C_A, low C_B D) High C_A, high C_B

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Answer & Solution

Answer: Option B

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100

The rate constant of a reaction depends on the

A) Initial concentration of reactants B) Time of reaction C) Temperature of the system D) Extent of reaction

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Answer & Solution

Answer: Option C

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Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering