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GATE 2025 ES – Question 18

Water and Wastewater Treatment and Management · Kinetics and Reactor Design · 1 mark · Multiple choice

Match reactor types 1 Plug flow,2 Continuously stirred tank,3 Batch with diagrams x, y, z. The stirrer symbol denotes mixing; diagrams are not to scale.

Diagram for GATE 2025 ES question 18
  1. 1–x,2–y,3–z
  2. 1–z,2–y,3–x
  3. 1–y,2–z,3–x
  4. 1–x,2–z,3–y

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Show answer and explanation

Correct answer: (B) 1–z,2–y,3–x

Explanation

Diagram z shows a flow-through tube without complete backmixing, the plug-flow idealization. Diagram y has continuous inlet/outlet and a stirrer, the CSTR. Diagram x has a stirrer but no continuous inlet/outlet, the batch reactor. Therefore **1–z,2–y,3–x, B**.

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