Chemical Engineering
GATE CH topic:instrumentation-and-process-control PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 54. Imported answers require independent review unless marked reviewed.
Question 30
Open questionCHMCQ2 marksNeeds review
Which of these symbols can be found in piping and instrumentation diagrams?
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Open questionCHMCQ2 marksNeeds review
It is required to control the volume of the contents in the jacketed reactor shown in the figure.
Which one of the following schemes can be used for feedback control?
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Open questionCHMCQ2 marksNeeds review
Which of the following is NOT a necessary condition for a process under closed-loop control to be stable?
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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 52
Open questionCHNAT2 marksNeeds review
A system has a transfer function
. When a step change of magnitude M is given to the system input, the final value of the system output is measured to be 120. The value of M is ________.Log in to check the answer
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Open questionCHNAT2 marksNeeds review
A process has a transfer function
. Initially the process is at steady state with
and
. If a step change in x is given from 0.4 to 0.5, the maximum value of y that will be observed before it reaches the new steady state is ________ (round off to 1 decimal place).Log in to check the answer
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Open questionCHMCQ1 markNeeds review
Hot-wire anemometer is used for the measurement of
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Open questionCHNAT1 markNeeds review
Consider the following closed loop system with
and
as the transfer functions of the process and the controller, respectively.For a unit step change in the set point (
), the change in the value of the response (
) at steady state is ________ (round off to 1 decimal place). 
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Open questionCHNAT2 marksNeeds review
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).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionCHNAT2 marksNeeds review
Consider the following closed loop system.
,
, 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).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 12
Open questionCHMCQ1 markNeeds review
A thermocouple senses temperature based on the
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