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Previous year question hub

Process Calculations - Chemical Engineering Previous Year Questions

Practice Process Calculations - Chemical Engineering previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

16Papers
16Years
36Questions
1Topics

Process Calculations question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Process Calculations. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Medium 19 52.8%
Easy 15 41.7%
Hard 2 5.6%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 19 52.8%
Numerical Answer Type (NAT) 15 41.7%
Fill in the blanks 2 5.6%

Subject weightage

Top subjects by unique question coverage.

Chemical Engineering
36 Qs

Most asked topics

Top topics across the included previous year papers.

Process Calculations
36 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Material and Energy Balances
23 Qs
Recycle, Bypass and Purge
10 Qs
Phase Rule and Degrees of Freedom
3 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Chemical Engineering (CH) 2026
2 Qs
Chemical Engineering (CH) 2025
1 Qs
Chemical Engineering (CH) 2024
2 Qs
Chemical Engineering (CH) 2023
3 Qs
Chemical Engineering (CH) 2021
1 Qs
Chemical Engineering (CH) 2020
1 Qs
Chemical Engineering (CH) 2019
1 Qs
Chemical Engineering (CH) 2018
2 Qs
Chemical Engineering (CH) 2017
2 Qs
Chemical Engineering (CH) 2014
2 Qs
Chemical Engineering (CH) 2013
2 Qs
Chemical Engineering (CH) 2012
2 Qs
Chemical Engineering (CH) 2011
5 Qs
Chemical Engineering (CH) 2010
3 Qs
Chemical Engineering (CH) 2009
3 Qs
Chemical Engineering (CH) 2008
4 Qs

Browse by subtopics

Open a focused page built from the same verified paper data.

Material and Energy Balances

Explore previous-paper coverage, trends and focused practice for Material and Energy Balances.

23 questions14 papers14 years

Recycle, Bypass and Purge

Explore previous-paper coverage, trends and focused practice for Recycle, Bypass and Purge.

10 questions9 papers9 years

Phase Rule and Degrees of Freedom

Explore previous-paper coverage, trends and focused practice for Phase Rule and Degrees of Freedom.

3 questions3 papers3 years

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Chemical Engineering (CH) 202620262View paper
Chemical Engineering (CH) 202520251View paper
Chemical Engineering (CH) 202420242View paper
Chemical Engineering (CH) 202320233View paper
Chemical Engineering (CH) 202120211View paper
Chemical Engineering (CH) 202020201View paper
Chemical Engineering (CH) 201920191View paper
Chemical Engineering (CH) 201820182View paper
Chemical Engineering (CH) 201720172View paper
Chemical Engineering (CH) 201420142View paper
Chemical Engineering (CH) 201320132View paper
Chemical Engineering (CH) 201220122View paper
Chemical Engineering (CH) 201120115View paper
Chemical Engineering (CH) 201020103View paper
Chemical Engineering (CH) 200920093View paper
Chemical Engineering (CH) 200820084View paper

Sample previous year questions

A varied preview from the papers represented in this selection, with every available option.

1
2008 · Chemical Engineering · Process Calculations · Phase Rule and Degrees of Freedom
Chemical Engineering (CH) 2008
Q.8 For a system containing species P, Q and R, composition at point k on the ternary plot is

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2
2009 · Chemical Engineering · Process Calculations · Material and Energy Balances
Chemical Engineering (CH) 2009
A dehumidifier (shown below) is used to completely remove water vapor from air.
Which ONE of the following statements is TRUE ?

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3
2010 · Chemical Engineering · Process Calculations · Material and Energy Balances
Chemical Engineering (CH) 2010
A new linear temperature scale, denoted by °S, has been developed, where the freezing point of water is 200°S and the boiling point is 400°S. On this scale, 500°S corresponds, in degrees Celsius, to
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4
2011 · Chemical Engineering · Process Calculations · Recycle, Bypass and Purge
Chemical Engineering (CH) 2011
Ammonia is synthesised at 200 bar and 773 K by the reaction \( N_2 + 3H_2 \rightleftharpoons 2NH_3 \). The yield of ammonia is 0.45 mol/mol of ammonia. Flow sheet for the process (along with available compositions) is shown below. The single pass conversion for \( H_2 \) in the reactor is 20 %. The amount of \( H_2 \) lost in the purge as a PERCENTAGE of \( H_2 \) in fresh feed is

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5
2012 · Chemical Engineering · Process Calculations · Recycle, Bypass and Purge
Chemical Engineering (CH) 2012
The reaction \(A_{(l)} + B_{(g)} \rightarrow C_{(l)} + D_{(g)}\) is carried out in a reactor followed by a separator as shown below. Notation: Molar flow rate of fresh B is \(F_{FB}\), Molar flow rate of A is \(F_A\), Molar flow rate of recycle gas is \(F_{RG}\), Mole fraction of B in recycle gas is \(Y_{RB}\), Molar flow rate of purge gas is \(F_{PG}\), Molar flow rate of C is \(F_C\). Here, \(F_{FB} = 2\) mol/s, \(F_A = 1\) mol/s, \(F_B/F_A = 5\) and A is completely converted. If \(Y_{RB} = 0.3\), the ratio of recycle gas to purge gas (\(F_{RG}/F_{PG}\)) is

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6
2013 · Chemical Engineering · Process Calculations · Material and Energy Balances
Chemical Engineering (CH) 2013
A reverse osmosis unit treats feed water (F) containing fluoride and its output consists of a permeate stream (P) and a reject stream (R). Let C_F, C_P, and C_R denote the fluoride concentrations in the feed, permeate, and reject streams, respectively. Under steady state conditions, the volumetric flow rate of the reject is 60 % of the volumetric flow rate of the inlet stream, and C_F = 2 mg/L and C_P = 0.1 mg/L. The value of C_R in mg/L, up to one digit after the decimal point, is
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