Power Machines N5 — Document

November 2022 — N5 — Power Machines

N5 2022 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 31 items found

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Q1— Section header —

1.1Define the TWO laws of thermodynamics

1.2State FOUR methods used to determine the dryness fraction of steam. (4\ 1. What are the TWO types of

Q2— Section header —

2.1Gamma

2.2The initial volume

2.3The final volume (3\

2.4The final temperature

2.5Change in internal energy in kJ (3\

2.6Work done (4 20

Q3— Section header —

3.1The s pecific enthalpy of superheated steam in kJ/kg (3\

3.2The v olume of superheated steam in m /kg (4\

3.3The i nternal energy of superheated steam in kJ/kg (3\

3.4The s pecific enthalpy of wet steam in kJ/kg (3\

3.5The v olume of wet steam in m /kg (2\

3.6The in ternal energy of wet steam in kJ/kg (3\

3.7The change in internal energy in kJ (2\ [20] 819003520

Q4— Section header —

4.1200 kg/h steam at 8,5 kPa condenses whil 0,0 8 kg air leaks into the condenser per 10 0 kg steam. The a

4.2A single acting, single cylinder reciprocating compressor runs at 120 r /min and the volumetric efficiency is 76%. The d iameter is 2 times stroke length. The air used is 12 m

4.2.1The s troke volume in m and the diameter in m

4.2.2The d elivery temperature

4.2.3The p ower required to drive the reciprocating compressor (4\ [20]20

Q5— Section header —

5.1A gas consists of 25% CO , 20% CH , 50% N and 5% O by

5.2A porter type governor has arms that support rotating balls each with a mass of 2,1 kg. The equilibrium height (h\is 0,22 m. The central dead load has a mass of 15 kg. Calculate the speed of rotation in

Q6— Section header —

6.1In landscape format, d raw a velocity diagram by using scale of 1 cm 25

6.2From the diagram determine: 6. .1 The n ozzle angle (1

6.3By using a diagram, calculate: The p ower required in kW (3\ [15] TOTAL:15

Multiple Choice Options

C)The gas constant is 0,296 kJ/kg.K.

Mark Allocation

Total100 marks

Sections20 + 20 + 15 + 15 = 70 marks

Paper information

TitleDocument

SubjectPower Machines

LevelN5

Document typeQuestion paper

Year2022

MonthNovember

Pages8

Downloads1

Examination context

Decade2020s

Years ago4y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2022

Days since exam1,439

About Power Machines examination preparation

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How to use this resource for revision

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A practical revision approach

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Archived on8 September 2026

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