Foundry Theory N1 — Memo

April 2018 — N1 — Foundry Theory

N1 2018 Nated Engineering

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1.1These grains have the least contact with one another in a rammed structure, thereby making the sand highly permeable to gases. Sand having rounded grains, however, lack strength and do not pack up to the optimum extent. The

1.2These grains have comparatively lower permeab lity and greater strength than the rounded ones. (2\ These grains have defined edges, and the surfaces are nearly flat. The produce higher strength and lower permeability in the mould than sub

1.4In some cases, the grains are cemented together su ch that they fail to separate when screened. They may consist of rounded, sub angular, or angular grains or a combination of the three. Such grains are called

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3.1Permeability Green compression strength Total (A.F.S \lay Sieve analysis Clay content rmeability Shear/ ensile/

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6.2Hole in the casting caused by trapped air or gases

6.3The portion of the flask placed between the cap and the drag when the mould has more than two sections

6.4The imperfect junction where two streams of metal me et but do not fuse

6.5Slight taper given to pattern to allow drawing from the sand

6.6A metal or wood frame, without top or bottom in which the mould is formed

6.7Moulding sand tempered with water to the proper consistency for foundry use

6.8e arranged to expedite a hand or machine operation

6.9Unsoundness in cast metals due to blow holes, shrinkage cavities and voids

6.10Loosening the pattern from the mould by jarring or knocking (10 (A

Q7— Section header —

7.1Before commencing to line the large ladle, it is advisable that it should be slightly heated; the furnace man coats the interior with a wash of clay of about the consistency of cream, and proceeds to apply the prepared sand or loam

7.2The bottom lining must be thicker than the sides because the molten metal poured from t he furnace hits the bottom with a force. (2\

7.3The lining of the ladle should have fibre in it. Venting must be done on the sides and the bottom, to help the gas escape. (5\

7.4If the ladle is not dried correctly, moisture is contained in th e lining. The moment molten metal is poured into the ladle, an explosion will occur . Metal and moisture is a very dangerous combination.

Mark Allocation

Sections25 + 10 + 11 + 7 + 10 = 63 marks

Paper information

TitleMemo

SubjectFoundry Theory

LevelN1

Document typeNated Engineering

Year2018

MonthApril

Pages5

Downloads4

Examination context

Decade2010s

Years ago8y

SeasonAutumn (SH)

Start daySunday

Exam periodApril 2018

Days since exam3,116

About Foundry Theory 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.

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