Refrigeration N2 — Memo

November 2022 — N2 — Refrigeration

N2 2022 Nated Engineering

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Q1— Section header —

1.1s a compressor where the crankshaft sticks out through the compressor housing so that an external motor can be coupled to the shaft. (2\

1.2.5

1.3Filter dryer (1.2.4\ is used to trap and remove all dirt and moisture in a refrigeration system. Sight glass (1.2.5\ is used to observe the condition

1.4o prevent costly damage to the compressor due abnormal operating conditions. (2\

1.5Oil pressure safety switch pressure switch Time delay relay Motor temperature sensor Overload and single

Q2— Section header —

2.1.5

2.2.1To reduce or eliminate vibrations of the pipes, thus reducing the risk of broken pipes.

2.2.2

2.3.1Convection (3\

2.5(4\ [20]20

Q3— Section header —

3.1Constant pressure expansion valve means valve that maintains a constant pressure in the evaporator. (2\

3.2Automatic expansion valve (1\

3.3It is designed and constructed to maintain a constant evaporating pressure. The flow of the refrigerant into the evaporator is based on the pressure of the refrigerant in the evaporator. As the pressure increases, the valve closes and allows fewer refrigerants to

3.4.7High pressure gauge High pressure valve stem Service hose High pressure side hose pressure side hose pressure valve stem

3.5ave a good emulsion (sludge\ resistance (Low wax content\ Have a low carbon reduction value (Good thermal stability\. Be free of impurities. Mix less or does not mix with the refrigerant (Good chemical stability\.

4.1.5

4.2.5

4.3It is a device used to produce a continuous flow of air. (2\

4.4The axial flow fans The mixed flow fans The cross flow fans The propeller fans (4\

4.520

Q5— Section header —

5.1R600a R502 R22 R134a R404a (4\

5.2Attach refrigerant cylinder to centre connection hose and open valve on low side of anifold. Place cylinder in upright position. Crack suction service valve two turns off back seat. Open valve on refrigerant cylinder and weigh in desired charge.

5.3(5\

5.4It is recommended to be used for field work. (1\

5.5.4Check electrical supply replace faulty wires Check electronic control board replace if not functioning Check for leaks and blockages and c orrectly charge plant Check all valves Check thermostatic valve condition

Mark Allocation

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleMemo

SubjectRefrigeration

LevelN2

Document typeNated Engineering

Year2022

MonthNovember

Pages5

Downloads2

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

About Refrigeration 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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Pages5

Archived on8 September 2026

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