GATE CH 2020 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

A catalytic gas phase reaction

is conducted in an isothermal packed bed reactor operated at steady state. The reaction is irreversible and second order with respect to the reactant P. The feed is pure P with a volumetric flow rate of 1.0 liter minute

and concentration of 2.0 mol liter

In addition, use the following assumptions:

The reactant and product are ideal gases

There is no volume change associated with the reaction

Ideal plug flow conditions prevail in the packed bed

When the mass of catalyst in the reactor is 4 g, the concentration of P measured at the exit is 0.4 mol liter

. The second order rate constant (in liter

mol

minute

) is ________ (correct up to one decimal place).

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Flow of water through an equal percentage valve is 900 liter h

at 30% opening, and 1080 liter h

at 35% opening. Assume that the pressure drop across the valve remains constant. The flow rate (in liter h

) through the valve at 45% opening is ________ (round off to nearest integer).

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Consider the following closed loop system.

Diagram for Chemical Engineering question 53

, and

are the transfer functions of the controller, the final control element and the process, respectively.

and

are the response and its set point, respectively. For a gain margin of 1.6, the design value of

is ________ (correct up to one decimal place).

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2020 · Paper 1

Question 51

Question 52

Question 53