Chemical Engineering
2025 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE CH 2025 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.
Question 55
Open questionCHNAT2 marksNeeds review
Gas containing 0.8 mol% component
is to be scrubbed with pure water in a packed bed column to reduce the concentration of
to 0.1 mol% in the exit gas. The inlet gas and water flow rates are 0.1 kmol/s and 3.0 kmol/s, respectively.For the dilute system, both the operating and equilibrium curves are considered linear. If the slope of the equilibrium line is 24, the number of transfer units, based on the gas side,
is ____ (rounded off to 1 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 56
Open questionCHNAT2 marksNeeds review
Solute
is absorbed from a gas into water in a packed bed operating at steady state. The absorber operating pressure and temperature are 1 atm and 300 K, respectively. At the gas-liquid interface
where
and
are the interfacial gas and liquid mole fractions of
, respectively. At a particular location in the absorber, the mole fractions of
in the bulk gas and in the bulk water are 0.02 and 0.002, respectively. If the ratio of the local individual mass transfer coefficients for the transport of
on the gas-side (
) to that on the water-side (
),
, then
equals ____ (rounded off to 3 decimal places).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 57
Open questionCHNAT2 marksNeeds review
Components
and
form an azeotrope. The saturation vapour pressures of
and
at the boiling point are 87 kPa and 72.7 kPa, respectively. The azeotrope composition is ____ mol%
(rounded off to the nearest integer).GIVEN:
where
and
are the liquid phase mole fraction and activity coefficient of component
, respectively.Log in to check the answer
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