In an exothermic chemical reactor, the manipulated variable is the flow rate of

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

Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

A

Air to open valve with the controller direct acting

B

Air to close valve with the controller indirect acting

C

Air to open valve with the controller indirect acting

D

Air to close valve with the controller direct acting

Which of the following is the optimum operating condition for an exothermic reversible reaction taking place in a plug-flow reactor?

A

Temperature should be high in the beginning and decreased towards the end of the reaction

B

Very low temperature should be used throughout the reaction

C

Very high temperature should be used throughout the reaction

D

None of these

With increase in the order of reaction (for all positive reaction orders), the ratio of the volume of mixed reactor to the volume of plug flow reactor (for identical feed composition, flow rate and conversion)

A

Increases

B

Decreases

C

Remains same

D

Increases linearly

The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always

A

1

B

>1

C

Equal to the order of reaction

In case of a __________ reactor, the composition in the reactor and at the exit of the reactor is the same.

A

Semi-batch

B

Tubular

C

Batch

D

Back-mix

The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

A

Final control element

B

On-off control

C

Floating control action

D

None of these

For high conversion in a highly exothermic solid catalysed reaction, use a __________ bed reactor.

A

Fixed

B

Fluidised bed reactor followed by a fixed

C

Fixed bed reactor followed by a fluidised

D

Fluidised

In an exothermic chemical reaction, the reactants compared to the products have

A

Higher temperature

B

More energy

C

Less energy

D

Same energy

Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum.

A

Increases

B

Remains unchanged

C

Decreases

D

Unpredictable from the data

In an exothermic chemical reactor, the manipulated variable is the flow rate of

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