Chemical Engineering
GATE CH topic:chemical-processes PYQs
Build your understanding with focused practice from past exam papers.
Questions 191–200 of 650. Imported answers require independent review unless marked reviewed.
Question 61
Open questionCHNAT2 marksNeeds review
Heat is available at a rate of 2 kW from a thermal reservoir at 400 K. A two-stage process harnesses this heat to produce power. Stages 1 and 2 reject heat at 360 K and 300 K, respectively. Stage 2 is driven by the heat rejected by Stage 1. If the overall process efficiency is 50% of the corresponding Carnot efficiency, the power delivered by the process, in kW, rounded off to 2 decimal places, is _____
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Open questionCHNAT2 marksNeeds review
A chemostat with cell recycle is shown in the figure. The feed flow rate and culture volume are
L h
and
L, respectively. The glucose concentration in the feed
g L
. Assume Monod kinetics with specific cell growth rate
, where
h
and
g L
. Assume maintenance and death rates to be zero, input feed to be sterile (
) and steady-state operation. The glucose concentration in the recycle stream,
, in g L
, rounded off to 1 decimal place, is ________
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Open questionCHNAT2 marksNeeds review
Consider the surge drum in the figure. Initially the system is at steady-state with a hold-up
, which is 50% of full tank capacity,
, and volumetric flow rates
. The high hold-up alarm limit
while the low hold-up alarm limit
. A proportional (P-only) controller manipulates the outflow to regulate the hold-up
as
. At
,
increases as a step from
to
. Assume linear control valves and instantaneous valve dynamics. Let
be the minimum controller gain that ensures
never exceeds
. The value of
, in
, rounded off to 2 decimal places, is ________ 
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Open questionCHNAT2 marksNeeds review
A PD controller with transfer function
is used to stabilize an open-loop unstable process with transfer function
, where
and time is in minutes. From the necessary conditions for closed-loop stability, the maximum feasible value of
, in minutes, rounded off to 1 decimal place, is __________Log in to check the answer
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Open questionCHNAT2 marksNeeds review
Consider a tray-column of diameter 120 cm. Each downcomer has a cross-sectional area of 75 cm². For a tray, the percentage column cross-sectional area not available for vapour flow due to the downcomers, rounded off to 1 decimal place, is __________
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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 1
Open questionGAMCQ1 markNeeds review
“You are delaying the completion of the task. Send _____ contributions at the earliest.”
Your answerChoose one option.
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References : _____ :: Guidelines : Implement (By word meaning)
Your answerChoose one option.
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In the given figure, PQRS is a parallelogram with PS = 7 cm, PT = 4 cm and PV = 5 cm. What is the length of RS in cm? (The diagram is representative.)
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
In 2022, June Huh was awarded the Fields medal, which is the highest prize in Mathematics.
When he was younger, he was also a poet. He did not win any medals in the International Mathematics Olympiads. He dropped out of college.
Based only on the above information, which one of the following statements can be logically inferred with certainty?
Your answerChoose one option.
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Open questionGAMCQ1 markNeeds review
A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.
The given figure consists of 16 unit squares arranged as shown. In addition to the three black squares, what is the minimum number of squares that must be colored black, such that both PQ and MN form lines of symmetry? (The figure is representative)
Your answerChoose one option.
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