# A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ? with Answer - Chemical Engineering Mcqs | TestPrep

> Solved MCQ: A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ? Correct Answer: D. The top and bottom compositions correspond to the maximum enrichment available. Verified answer explanation for FPSC, PPSC, MDCAT, NTS, and CSS competitive exam preparation.

---

Tested in Competitive Exams:

- [NTS Test Prep](https://test-prep.blog/exams/nts)
- [FPSC Past Papers](https://test-prep.blog/exams/fpsc)
- [PPSC Solved MCQs](https://test-prep.blog/exams/ppsc)
- [PMDC MDCAT 2026](https://test-prep.blog/exams/mdcat)
- [UET ECAT Prep](https://test-prep.blog/exams/ecat)
- [CSS Central Superior](https://test-prep.blog/exams/css)

- [Chemical Engineering Mcqs](https://test-prep.blog/categories/chemical-engineering-mcqs)
Difficulty: Moderate 75% Accuracy

# A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?

Direct Answer & Quick Reference

The correct option is **D. The top and bottom compositions correspond to the maximum enrichment available**.

A. Composition of vapors and that of liquid do not vary throughout the column

B. Reboiler load and condenser load are minimum

C. The top and bottom compositions are unchanged with and without total reflux

D. The top and bottom compositions correspond to the maximum enrichment available **(Correct Answer)**

✨ Explain with AI

Verified Key: D. The top and bottom compositions correspond to the maximum enrichment available
Solved by 1,580+ students

Verified against official examination board answer keys and standard curriculum textbooks.

- [Previous Question Which of the following is a type of sedimentary rock?](https://test-prep.blog/mcq/which-of-the-following-is-a-type-of-sedimentary-rock-3c37d9b4-29f3-4b85-8ee8-c30cddad8e31)
- [Next Question Which of the following rock favors petroleum formation?](https://test-prep.blog/mcq/which-of-the-following-rock-favors-petroleum-formation-8de34f5c-5054-406d-81ba-a2b7a775b708)

- [Practice More Chemical Engineering Mcqs MCQs](https://test-prep.blog/quiz/smart?category=chemical-engineering-mcqs)
- [How We Verify Questions →](https://test-prep.blog/editorial-policy)

## Subject Overview

Explore thousands of solved past paper MCQs for Chemical Engineering Mcqs categorized with explanations.

- [Browse All Chemical Engineering Mcqs MCQs →](https://test-prep.blog/categories/chemical-engineering-mcqs)

## Related Questions

- [Which of the following is a type of sedimentary rock?](https://test-prep.blog/mcq/which-of-the-following-is-a-type-of-sedimentary-rock-3c37d9b4-29f3-4b85-8ee8-c30cddad8e31)
- [Which of the following rock favors petroleum formation?](https://test-prep.blog/mcq/which-of-the-following-rock-favors-petroleum-formation-8de34f5c-5054-406d-81ba-a2b7a775b708)
- [DLS stands For _____ ?](https://test-prep.blog/mcq/dls-stands-for-334d51e8-f12a-4948-aae4-0a921c1cabdc)
- [RIH stands for _____ ?](https://test-prep.blog/mcq/rih-stands-for-bb6912da-ac66-4daa-8872-080b0065be37)
- [“The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements.” This is the statement of _____ ?](https://test-prep.blog/mcq/the-heat-capacity-of-a-solid-compound-is-approximately-equal-to-the-sum-of-the-h-05c6d5e6-380a-4820-b10d-3ecfd779b04c)

---
*Source: https://test-prep.blog/mcq/a-distillation-column-with-n-plates-is-being-operated-under-normal-conditions-at-0eb17f9d-d131-429d-9ee0-7cdb1ad5ed91*
*Format: Markdown for Agents (Content Negotiation: text/markdown)*