Environmental Science and Engineering
GATE ES topic:kinetics-reactor-design PYQs
Build your understanding with focused practice from past exam papers.
Questions 11–13 of 13. Imported answers require independent review unless marked reviewed.
Question 30
Open questionESMCQ2 marksNeeds review
An ideal PFR or an ideal CFSTR may be used to degrade a pollutant with first order reaction kinetics. Both the reactors are fed with the same inlet concentration and the same volumetric flow rate, and are designed to achieve the same outlet concentration. Which of the following statements is true when comparing PFR with CFSTR?
PFR is Plug Flow Reactor.
CFSTR is Continuous Flow Stirred Tank Reactor (also referred to as CSTR).
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 47
Open questionESNAT2 marksNeeds review
An underground hazardous waste storage tank is leaking. The contaminant concentration directly beneath the site is 0.5 mg/L. The contaminant is travelling at an effective rate of 0.4 m per day towards a water well which is 2 km away. Assume that the degradation of the contaminant follows a first order reaction, and the initial concentration of the contaminant becomes half in 10 years. In this case, the contaminant concentration expected at the well under steady state conditions is ______ mg/L (rounded off to two decimal places).
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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 55
Open questionESNAT2 marksNeeds review
A facultative pond system for sewage treatment consists of two ponds in series. The hydraulic retention time (HRT) of each pond is 6 days. The total BOD₅ reduction through the entire pond system is 90 %. If the ponds are considered to be completely mixed, then the rate constant describing the BOD₅ removal is ______ day⁻¹ (rounded off to two decimal points). Assume that the rate constant is same for both the ponds.
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