Discussion
Consider the following statements about tanks in series.
1. Conversion rises with the number of tanks for a fixed total volume.
2. The improvement per additional tank diminishes.
3. Ten tanks give twice the conversion of five.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: conversion rises with the number of tanks at fixed total volume, and each addition helps less than the last because the cascade is approaching the plug flow limit it cannot pass. Statement 3 mistakes a diminishing return for a proportional one - conversion is bounded by 100 per cent, so it cannot double however many tanks are added.
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