GATE 2019 Civil Engineering Q42

Question

Consider the reactor shown in the figure. The flow rate through the reactor is Q m³/h. The concentrations (in mg/L) of a compound in the influent and effluent are Co and C, respectively. The compound is degraded in the reactor following the first order reaction. The mixing condition of the reactor can be varied such that the reactor becomes either a completely mixed flow reactor (CMFR) or a plug-flow reactor (PFR). The length of the reactor can be adjusted in these two mixing conditions to LCMFR and LPFR while keeping the cross-section of the reactor constant. Assuming steady state and for C/Co = 0.8, the value of LCMFR/LPFR (round off to 2 decimal places) is _________

Accepted Answer

1.10 to 1.15