Chemical Engineering
2024 · Paper 1
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Complete GATE CH 2024 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
Alumina particles with an initial moisture content of 5 kg per kg dry solid are dried in a batch dryer. For the first two hours, the measured drying rate is constant at 2 kg m
h
. Thereafter, in the falling-rate period, the rate decreases linearly with the moisture content. The equilibrium moisture content is 0.05 kg per kg dry solid and the drying area of the particles is 0.5 m
per kg dry solid. The total drying time, in h, to reduce the moisture content to half its initial value isYour answerChoose one option.
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Open questionCHMCQ2 marksNeeds review
A first-order heterogeneous reaction
is carried out using a porous spherical catalyst. Assume isothermal conditions, and that intraphase diffusion controls the reaction rate. At a bulk
concentration of 0.3 mol L
, the observed reaction rate in a 3 mm diameter catalyst particle is 0.2 mol s
L
catalyst volume. At a bulk
concentration of 0.1 mol L
, the observed reaction rate, in mol s
L
catalyst volume, in a 6 mm diameter catalyst particle, isYour 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
A first-order liquid phase reaction
is carried out in two isothermal plug flow reactors (PFRs) of volume 1 m
each, connected in series. The feed flow rate and concentration of
to the first reactor are 10 m
h
and 1 kmol m
, respectively. At steady-state, the concentration of
at the exit of the second reactor is 0.2 kmol m
. If the two PFRs are replaced by two equal-volume continuously stirred tank reactors (CSTRs) to achieve the same overall steady-state conversion, the volume of each CSTR, in m
, isYour answerChoose one option.
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