CHEMICAL REACTION ENGINEERING QUIZ

Exothermic reactions are best carried out in

A plug flow reactor followed by CSTR

A CSTR

CSTR in series

CSTR followed by a plug flow reactor

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YOUR ANSWER : ?

Which of the following is a characteristic of an ideal plug flow reactor?

Uniform mixing

Axial dispersion

Flat velocity profile

None of these

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Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.

Proportional to the square of

Independent of

Inversely proportional to

Proportional to

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The rate at which a chemical substance reacts is proportional to its

Molecular weight

None of these

Active mass

Equivalent weight

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The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called

A ferment or an enzyme

Fungi

None of these

Haemoglobin

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Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?

Ash resistance

Surface phenomenon resistance

Gas film and pore surface diffusion resistances for reactants

Gas film and pore surface diffusion resistances for products

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A batch reactor is

Suitable for gas-phase reactions on commercial scale

Most suitable for very large production rate

Suitable for liquid phase reactions involving small production rate

Least expensive to operate for a given rate

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YOUR ANSWER : ?

For a tubular flow reactor with uniform concentration and temperature, the independent variable is

Length

None of these

Diameter

Time

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A batch reactor suffers from following disadvantage.

High labour and handling cost

High shutdown time requirement for emptying, cleaning and refilling

All of these

Poor product quality control

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What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?

First

Zero

Second

Third

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