Chemical Plant Operation N4 — Document

August 2021 — N4 — Chemical Plant Operation

N4 2021 Nated Engineering

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🎯 1 marks ⏱️ 3h 📄 6 pages 📝 45 items found 📚 1 topics

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Q1— Section header —

Q2— Section header —

2.5\n the ANSWER BOOK. COLUMN A COLUMN B

2.5ammer mill with internal classification ype of energy that may be expressed as ype of hardness that can be reduced by heating water atalyst used during esterification

Q3— Section header —

3.1Define the (2\

Q3— Section header —

3.3Describe a water hammer (4\

3.4Explain how you would eliminate water hammer. (2\

3.5A fluid is travelling at a speed of 0 173 m /min through a pipe with an inside diameter of 590 mm

3.5.1Calculate the average linear velocity. (5\

3.5.2Determine the type of fluid flow that is travelling through the pipe. (4\

3.6List TWO types of energy that are required for fluid to flow through any type of conduct. (2\ [20]20

Q4— Section header —

4.1Describe grinders (2\

4.2The FIGURE below shows an attrition mill Label the parts by writing down each name next to the letter (A

4.3Sketch a fully labelled diagram of smooth roll crusher and describe its operation. (10\

4.4Name THREE types of grinders. (3\ [20] 805000420

Q5— Section header —

5.1Complete the following paragraph on the production of oxygen and nitrogen via the cryogenic process by writing down the missing words next to the question number (5.1.1

5.1.11\in the ANSWER BOOK. Filtered air is compressed in a

5.1.1and cooled. After separating out a ll liquid water, the air enters

5.1.2and is cooled by exchang ing heat with the outgoing

5.1.3products. As the air cools, moisture is condensed and

5.1.4on the walls of the

5.1.5passage. At the lower temperature,

5.1.6also freezes . The air emerging from the heat exchanger is thus completely dry and free of

5.1.7. The cleaned gas is then fed to the bottom tray in the lower column of the double column rectifier. Because .1.8

5.1.9The oxygen product is removed as

5.1.10vapour from the main

5.1.11

5.2State FOUR methods that are used in the manufacturing of carbon dioxide. (4\

5.3Give FIVE uses of nitrogen. (5\ [20]20

Q6— Section header —

6.1Halogenation and chlorination are used mainly to affect the entrance into the hydrocarbon ring.

6.1.1Nam e THREE ways in which chlorination can take place. (3\

6.1.2Define halogenation (2\

6.1.3

6.2List THREE types of copper alloys. (3\

6.3State FOUR properties of steel. (4\ [15] (8050004\ Copyright reserved15

Q7— Section header —

7.1Differentiate between cation exchange and anion exchange. (2\

7.2Give the steps of hot lime soda treatment in sequence

7.3Define biochemical oxygen demand. (2\

7.4Complete and balance the following reaction equation: CaR + 2NaCl (2\ [15] TOTAL: 100 (8050004\15

Topics Identified

Business Functions

Mark Allocation

Total100 marks

Sections5 + 20 + 20 + 20 + 15 + 15 = 95 marks

Paper information

TitleDocument

SubjectChemical Plant Operation

LevelN4

Document typeQuestion paper

Year2021

MonthAugust

Pages7

Downloads5

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

About Chemical Plant Operation examination preparation

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A practical revision approach

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File size298.7 KB

Pages7

Archived on8 September 2026

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