Making N4 — Exam Paper P2

December 2023 — N4 — Making

N4 2023 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 53 items found

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Q1— Section header —

1.10\n the ANSWER BOOK.

1.1Shrinkage

1.2Unbleached

1.3Water esistance

1.4Fourdrinier

1.5Virgin

1.6Transparent nk

1.7Smearing

1.8Reducers

1.9Metallic nk

1.1020

Q2— Section header —

2.5\n the ANSWER BOOK.

2.1Acidity is the degree of acid found in a given paper substance measured by pH level from 0 to 7.

2.2Paper grammage is determined by visually inspecting the sheet of paper

2.3Binder cements the pigment particles firmly to the paper surface as well as to one an other.

2.4In printing, printed image that runs off the edges of a page is referred to as bleed.

2.55

Q3— Section header —

3.1The refining of pulp at high consistency can be beneficial to the properties of pulp and paper. What are the benefits of high consistency refining? (2\

3.2With the aid of a drawing explain the operations of a disk save. (6 [8]8

Q4— Section header —

4.1The main function of the approach flow system is to dilute the thick stock.

4.1.1Why is it necessary to dilute the thick stock? (1\

4.1.2Explain how dilution is achieved and controlled in an approach flow system. (4\

4.2Make a labelled drawing of the Fourdrinier section of a paper machine. (5\ [10]10

Q5— Section header —

5.1Name FIVE types of additives commonly used in the wet end of a paper machine. (5\

5.2Give FOUR advantages of retention aids in a papermaking plant. (8\ [13]13

Q6— Section header —

6.1Significant savings in energy costs can be made if the amount of water removed at the press section is increased. Explain how the following factors influence water removal in the press section:

6.1.1Nip impulse (3\

6.1.2Basis mass (2\

6.1.3Temperature (1\

6.2The effective removal of condensate by the use of siphons is crucial for efficient dryer performance. Describe THREE types of siphons that are commonly used in dryer cylinders and explain their principles of operation.

Q7— Section header —

7.1The various factors affecting the quantity of starch picked up at the size press can be divided into two groups, namely absorption factors and film splitting factors. Name these factors and explain how each fac

7.2Explain what is meant by the term edge relief on the calendar stack. (2\

7.3Explain how roll density profile can be controlled on the winder. (5\ [11]11

Q8— Section header —

8.1How does refining affect the following paper properties

8.1.1Burst strength

8.1.2Ring crush

8.1.3Opacity

8.1.4Tensile strength

8.1.5Brightness

8.1.6

8.2Name THREE ways in which a contaminated drier fabric can affect the paper machine (6\ [12]12

Q9— Section header —

9.1Economic considerations

9.2Mechanical cleaning

9.3Chemical cleaning (3 3\ [9] TOTAL SECTION B: 75 GRAND TOTAL: 1009

Mark Allocation

Total100 marks

Sections20 + 5 + 8 + 10 + 13 + 12 + 11 + 12 + 9 = 100 marks

Paper information

TitleExam Paper

SubjectMaking

LevelN4

Document typeQuestion paper

Year2023

MonthDecember

Pages5

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSummer (SH)

Start dayFriday

Exam periodDecember 2023

Days since exam1,044

About Making 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

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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.

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