Fluid Mechanics N5 — Memo

August 2021 — N5 — Fluid Mechanics

N5 2021 Nated Engineering

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Q1— Section header —

1.1The purpose of bearing lubrication is to prevent direct metallic (metal to metal\ contact between different rotating and sliding component in a mechanical mechanism. (2\

1.2Increases the expected life span of the material Reduction of friction and wear Dissipation of friction heat Prevents metal decay due to corrosion Protect against harmful elements density measured in m

1.4.2sm /10096,24 02,0 26 150,3150 30010 0,0280,111105 30010 0,0267

Q2— Section header —

2.1.1...' 0,68 0,0425 652,8 PPPascalslaw kN

2.1.20,683,4 0,04250,425 2048 cp ccpp SVSV ASLnASL dSL dSL

2.1.3652,83,4 2219,52 WDFsl (2\

2.1.42219,5 43,52 time 0,060,17 480,66410 SVASL 43,410 0,06 1,203

Q3— Section header —

3.1.11,45 0,725 0,96310009,810,725 6,849 Pgy kPa 6,8491,45 11,31 FPA

3.2.20,05 748,324109,81 1165,499/ WgV kgm 33 12609,810,05784,324109,81 808,99937810748,324109,81 60,67537810

Q4— Section header —

4.1.1It is the path line or route followed by the fluid particle in motion which may never intersect each other, where the line is instantaneous tangent to the velocity vector in the streamline at that particular point.

4.1.3It is the path or route which a fluid particle follows in a fluid flow, where the path of each particle will be determined by the streamline route over a period of time.

4.1.4This is the type of flow that is accompanied by indiscriminate eddy currents causing the fluid particles to flow in a disorderly manner in relation to its path line.

4.1.5

4.2.193,4510 21,96 4,25610/ volume time 4,256100,0549 4,25610 2,36719810 1,798/

Q5— Section header —

5.1An orifice is an opening or hole in the bottom side of the tank used to discharge fluid at a given unit of time. (2\

5.2.1' : 19,6259,4 34,138/ orifice withtheaidofBernoullistheorem vgh 44,77410 0,0134 33,852/

5.3' : 6,810 9,81880 787,69345 19,62787,6934510 0,7150,2135 0,2135 0,34 0,02559723,931227

Q6— Section header —

6.18200,222,3569,81 720,433/ systeminout fromWmg asQQQcontinuityofflow WQg ... 0,22 2,356

6.686,856100,22 3301,681 ininin FPA 73,4397,298 535,956 outoutout Fmv (1\

6.847,884100,125 587,625 outoutout FPA 222 cos 173,0223301,681535,956587,625cos52 2782,95 535,956587,625sin52

Mark Allocation

Sections20 + 20 + 20 + 20 + 20 + 20 = 120 marks

Paper information

TitleMemo

SubjectFluid Mechanics

LevelN5

Document typeNated Engineering

Year2021

MonthAugust

Pages11

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,896

About Fluid Mechanics 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

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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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