Power Machines N6 — Document

December 2023 — N6 — Power Machines

N6 2023 Nated Engineering

↓ Download PDF 📄 388 KB

Preparing document

📋 Document Analysis

🎯 100 marks ⏱️ 3h 📄 6 pages 📝 41 items found 🔑 1 key info

See full analysis

Questions — A Preview of What to Expect in the Document

This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

1.1The compressor pressure ratio and pressure in each in tercooler (5\

1.2The low pressure cylinder volumetric efficiency and the induced volume in cubic metres per shift (6\

1.3The compressor indicated power in kilowatts (4\

1.4Sketch a labelled pressure volume diagram for the compressor ind icating at least THREE pressure values. (5\ [20]20

Q2— Section header —

2.1The specific enthalpy at the nozzle throat and exit (5\

2.2The ve locity of steam at the nozzle throat and exit in m/s (5\

2.3The specific volume of steam at the nozzle throat and exit (5\

2.4The area in square millimetres at the throat and exit (5\ [20] (8190046\ Copyright reserved20

Q3— Section header —

3.1Indicate whether the following statement is TRUE or FALSE by writing only 'True' or 'False' next to the question number (

3.2

3.2; determine:

3.2.1The nozzle angle and the turbine specific work output (4\

3.2The turbine diagram efficiency (3\ [20]20

Q4— Section header —

4.1What is the property of steam called that stays unchanged d uring a reversible adiabatic process? (2\

4.2

4.2.1The heat transfer in the air pre heater per kilogram of fuel and express it as a percentage of the plant supply energy (4\

4.2.2The heat transfer in the economiser per kilogram of fuel and express it as a percentag e of the plant supply energy (4\

4.2.3

4.2.4The plant thermal efficiency (4\ [20] (8190046\ Copyright reserved20

Q5— Section header —

5.1Explain the difference between indicated power and brak e power in internal

5.2A two stroke, six cylinder internal combustion engine running at 375,08 revolutions a minute has a clearance volume of 410 cm and indicated mean effective pressure of 0,755 MPa. After expansion, the pr

5.2.1The swept volume and cylinder volume in each cylinder in cm (5\

5.2.2The indicated power of the engine in kilowatts (3\

5.2.3The pressure at the end and start of compression in kilopascals (9\ [20]20

Q6— Section header —

6.1Sketch a labelled pressure enthalpy diagram and indicate any TWO entha lpy values (5\

6.2Calculate the specific enthalpy at the compressor inlet and exit (5\

6.3Determine the specific enthalpy dryness fraction and specific entropy at the evaporator inlet (6\

6.4Calculate the work done by the compressor in kilowatts (4\ [20] (8190040\20

Q7— Section header —

7.1In relation to thermodynamic cycles, explain the difference between gross heat addition and nett heat addition. (3\

7.2

7.2.1The temperature and pressure at the end of adiabatic compression (4\

7.2.2The temperature at the start of constant pressure heat addition (3\

7.2.3The temperature at the end of expansion (5\

7.2The constant volume heat addition and heat rejection in kJ/s (5\ [20] TOTAL: 100 (8190046\20

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 + 20 + 20 + 20 = 140 marks

Key Information

Contact Number0 24 285 1470

Paper information

TitleDocument

SubjectPower Machines

LevelN6

Document typeQuestion paper

Year2023

MonthDecember

Pages12

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSummer (SH)

Start dayFriday

Exam periodDecember 2023

Days since exam1,044

About Power Machines 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.

File details

File size388 KB

Pages12

Archived on8 September 2026

File age45d

ContributorFreeMode

FingerprintF07999704CC5

Questions and learner discussion

No questions or discussions have been posted yet.