Industrial Instruments N6 — Memo

August 2018 — N6 — Industrial Instruments

N6 2018 Nated Engineering

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Q1— Section header —

1.1Anode wire(+\ (5\

1.2otential of 500 to 3 000 V is placed between the wire and the metal shell, so that X- ray photons entering the tube will initiate a cumulative ionisatio n process, giving

1.3(3\ The arc makes use of a high voltage and self starting, as voltage produced on the secondary of the transformer is sufficient to break down the electrode he arc strikes alternately from each electrode on each cycle

1.4.6(6 (6\

1.5The amount of absorption of a specific wavelength of infrared ener gy which is proportional to the gas concentration in the mixture When energy of a given frequency passes through a compound with molecules of

1.6Interference filtersReflecting mirrorMoving samplemeterAmpDetectorInfra red sourceConcave lens (6\ [30] TOTAL SECTION A: 8330

Q2— Section header —

2.1Override control is when two or more control loops are connected to a common valve in such a way that under normal conditions, the normal control loop is in command of the valve. However, some abnor mal

2.2Equal percentage 83

2.5(3 (6\ [25] TOTAL SECTION B: SECTION C: DISTILLATION COLUMN AND STEAM BOILERS25

Q3— Section header —

3.1The liquid mixture (e.g. butane lighter material and pentane = heavier material\, that has to be separated, is fed into the middle of the distillation lumn If the temperature is varied , some of the lighter material will go into

3.2Small boilers with relatively high storage volumes and slow changing loads (2\

3.3

3.4Air control valve hen air supply stops , the control valve must close the supply of fuel. (2\

3.5V-2V-3V-4FRCTower feedColumnTemperaturedetectorTRCFRCSteamReboilerLTLIC (11\

3.6Any variation of pressure will upset the control system, by changing the equilibrium condition of the material in the column. A set point for pressure is a compromise between two extremes. The pressure must be high enough to cause condensation of the overhead

Q4— Section header —

4.1needs to be present in sufficient quantity to produce an ignitable or explosive mixture. Oxidis must be present in sufficient quantity in combination with flammable substance to produce an explosive mixture. Most common is air

4.2The flash point of a flammable liquid is the lowest temperature at which a sufficient quantity of vapour will arise to permit ignition under laboratory conditions. (2\

4.3Intrinsically safe method Dust ignition proof method Hazardous locations can also be described as those locations where electrical equipment might be i nstalled and which, by their nature, might present a condition which could become explosive if the elements for

Mark Allocation

Sections30 + 25 + 30 + 15 = 100 marks

Paper information

TitleMemo

SubjectIndustrial Instruments

LevelN6

Document typeNated Engineering

Year2018

MonthAugust

Pages7

Downloads3

Examination context

Decade2010s

Years ago8y

SeasonWinter (SH)

Start dayWednesday

Exam periodAugust 2018

Days since exam2,993

About Industrial Instruments 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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