Chemical Technology N6 — Document

December 2023 — N6 — Chemical Technology

N6 2023 Nated Engineering

↓ Download PDF 📄 1.3 MB

Preparing document

📋 Document Analysis

🎯 2 marks ⏱️ 3h 📄 6 pages 📝 44 items found

See full analysis

Questions — A Preview of What to Expect in the Document

This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

1.1Name TWO drying processes. (2\

1.2Name TWO coefficients that affect the drying rate of materials. (2\

1.3List SIX types of dryers used for solids and paste. (6\

1.4Study the diagram in FIGURE 1 and answer questions that follow: FIGURE 1: TYPICAL DRYER FOR LIQUID OR SLURRY MATERIAL

1.4.1What is the dryer shown in FIGURE called (1\

1.4.2Name the parts labelled A to F by writing the answer next to the letter (A F\in the ANSWER BOOK (6\

1.4.3Give a brief description of the operation of the dryer in FIGURE 1 (10\

1.4.4Explain the general guidelines that one would apply in select ing dryer. (6\

1.5A fl ash dryer is one of the dryers that evaporate solutions and slurries to dryness entire

1.6Give the advantages of the use of EACH of the following dryers:

1.6.1Thin film dryer (3\

1.6.2Screen conveyor dryer (4\ [50] (15040106\50

Q2— Section header —

2.1Spurious nucleation is one of the methods to be avoided during the formation of crystal

2.1.1Differentiate between initial breeding and veiled growth (11\

2.1.2Explain how initial breeding can be prevented. (3\

2.1.3Name TWO methods used to avoid all forms of spurious nucleation (2\

2.2Describe crystallisation under the following headings:

2.2.1Rate of nucleation (4\

2.2.2Ostwald ripening (5\

2.3Write brief notes on equilibrium and yields in the crystallisation processes. (10\ [35]35

Q3— Section header —

3.1State Fourier's law of heat transfer by conduction. (6\

3.2Write brief notes on each of the following:

3.2.1Absorptivity (2\

3.2.2Emissivity (5\

3.2.3Black body (2\

3.3Name FIVE uses of heat exchanger in the industr (5\

3.4Briefly explain the following:

3.4.1Overall coefficient of heat (5\

3.4.2Critical temperature difference (6\ (15040106\ Copyright reserved Please turn over

3.5A steam pipe has an inside diameter of 45,5 mm, a wall thickness of 4,2 mm and K = 55 W,m .K

Q4— Section header —

4.1Briefly explain the difference between evaporation distillation and crystallisation (6\

4.2Evaporators are often described according to the flow of the solution through the heat exchanger.

4.2.1Draw a labelled diagram of a long tube evaporator with upward flow. (7\

4.2.2Discuss the operation of a long tube evaporator with upward flow. (10\ [23] 1504010623

Q5— Section header —

5.1Briefly explain the operation of a natural draught cooling tower. (10\

5.2Study the drawing of a typical cooling tower in FIGURE 2 below and a nswer the question that follow: FIGURE 2: TYPICAL COOLING TOWER

5.2.1What is the cooling tower shown in FIGURE 2 called? (2\

5.2.2Write a brief description about the operation of the cooling tower in FIGURE 2. (12\

5.3

Mark Allocation

Total200 marks

Sections50 + 35 + 50 + 23 + 42 = 200 marks

Paper information

TitleDocument

SubjectChemical Technology

LevelN6

Document typeQuestion paper

Year2023

MonthDecember

Pages8

Downloads2

Examination context

Decade2020s

Years ago3y

SeasonSummer (SH)

Start dayFriday

Exam periodDecember 2023

Days since exam1,044

About Chemical Technology examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

File details

File size1.3 MB

Pages8

Archived on8 September 2026

File age46d

ContributorFreeMode

Fingerprint004104116BE7

Questions and learner discussion

No questions or discussions have been posted yet.