Power Machines N5 — Document

April 2019 — N5 — Power Machines

N5 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 5 pages 📝 36 items found

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Q1— Section header —

1.1There are two laws of thermodynamics, namely Joule s law the first law \and Clausius

1.2What is the function of a governor in a mechanical mechanism? (2\

1.3What are the TWO basic products of combustion resulting from a chemical reaction between a hydrocarbon and oxygen? (2\

1.4Name TWO particulars of manufacturers information that should be engraved or printed on the boiler. (2\

1.5Name the TWO classifications of s team turbines depending on how steam expansion takes place. (2\ [10]10

Q2— Section header —

2.1The volume at the end of the isothermal process (3\

2.2The final pressure at the end of the constant volume process (3\

2.3The specific heat capacity at constant pressure in kJ/kg.K (2\

2.4The quantity of heat transferred during the isothermal process and the heat received (absorbed\uring the expansion process in kJ/kg (4\

2.5The total change in internal energy for the entire process in kJ/kg (4\

2.6The total change in entropy for the entire process in kJ/kg (4\ [20] 819003520

Q3— Section header —

3.1The total enthal py of superheated steam in kJ (4\

3.2The total volume of superheated steam in m (4\

3.3The total enthalpy of wet steam in kJ (4\

3.4The total volume of wet steam in m (4\

3.5The total change in internal energy in kJ (4\ [20]20

Q4— Section header —

4.1A quantity of 3 200 kg of steam per hour flows into a condenser at a pressure of 11 kN/m and is 9% wet. The air leakage is 1,5 kg per 1 000

4.1.1The outlet (final\ temperature of the cooling water (6\

4.1.2The capacity of the air pump in m /minute (5\

4.2The composition of a gaseous fuel has the following structura l analysis according to volume: = 37% CH = 29%

4.2.1The volume of air required to completely burn 1 of the fuel (5\

4.2.2The total percentage analysis, by volume, of ALL the products of combustion (4\ [20] 819003520

Q5— Section header —

5.1Construct a velocity diagram in the ANSWER BOOK on landscape to a scale of 1 cm = 50 m/s. Indicate all the angles and the velocity values in m/s on the velocity diagram. NO MARKS WILL BE AWARDED FOR THE VELOCITY DIAGRAM IF THE

5.2Use the diagram to determine the following:

5.2.1The angle at which the steam leaves the turbine

5.2.2

5.3Use the diagram to calculate the power developed by the turbine. (3\ [15]15

Q6— Section header —

6.1The cylinder volume of the compressor in m (9\

6.2The delivery temperature of the compressor (2\

6.3The power required to drive the compressor in kW (4\ [15] TOTAL 100 819003515

Multiple Choice Options

C)The gas

C)Cooling water

C)Take

Mark Allocation

Total100 marks

Sections10 + 20 + 20 + 20 + 15 + 15 = 100 marks

Paper information

TitleDocument

SubjectPower Machines

LevelN5

Document typeQuestion paper

Year2019

MonthApril

Pages8

Downloads3

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,749

About Power Machines examination preparation

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How to use this resource for revision

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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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