Project ForgeOutlet tracer concentration profiles (c vs. t) for a pulse input are shown in three figures: Figure 1 (pure exponential decay from the maximum at t=0), Figure 2 (a decay curve with a distinct spike/discontinuity marked partway along it), Figure 3 (a curve rising from zero to a peak, then decaying). Match Group I (P=Figure 1, Q=Figure 2, R=Figure 3) with Group II reactor configurations (I. PFR, II. CSTR, III. PFR and CSTR in series, IV. PFR and CSTR in parallel).
- P-II, Q-IV, R-III
- BP-IV, Q-III, R-I
- CP-III, Q-IV, R-II
- DP-I, Q-III, R-II
Explanation
Figure 1's immediate jump to maximum followed by pure exponential decay is the textbook signature of an ideal CSTR (P-II). A PFR-and-CSTR-in-PARALLEL configuration superimposes an immediate decaying exponential (from the CSTR branch) with a delayed impulse spike (from the PFR branch arriving at its own residence time) — matching Figure 2's decay-curve-with-a-spike (Q-IV). The remaining smooth rise-then-decay shape of Figure 3 is matched to the series PFR-and-CSTR configuration (R-III) by elimination.
Source: GATE CH 2011 (2011)
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