Chemical Engineering
2023 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE CH 2023 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 43–45 of 65. Imported answers require review unless explicitly marked reviewed.
Question 43
Open questionCHMCQ2 marksNeeds review
CO and H
participate in a catalytic reaction. The partial pressures (in atm) of the reacting species CO and H
in the feed stream are
and
, respectively. While CO undergoes molecular adsorption, H
adsorbs via dissociative adsorption, that is, as hydrogen atoms. The equilibrium constants (in atm
) corresponding to adsorption of CO and H
to the catalyst sites are
and
, respectively. Total molar concentration of active sites per unit mass of the catalyst is
(in mol.(g cat)
). Both the adsorption steps are at equilibrium. Which one of the following expressions is the CORRECT ratio of the concentration of catalyst sites occupied by CO to that by hydrogen atoms?Your answerChoose one option.
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Open questionCHMCQ2 marksNeeds review
A cascade control strategy is shown in the figure below. The transfer function between the output (
) and the secondary disturbance (
) is defined as
Which one of the following is the CORRECT expression for the transfer function
? 
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 45
Open questionCHMCQ2 marksNeeds review
Level (
) in a steam boiler is controlled by manipulating the flow rate (
) of the make-up (fresh) water using a proportional (P) controller. The transfer function between the output and the manipulated input is
. The measurement and valve transfer functions are both equal to 1. A process engineer wants to tune the controller so that the closed-loop response gives decaying oscillations under servo mode. Which one of the following is the CORRECT value of the controller gain to be used by the engineer?Your answerChoose one option.
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