Power Machines N6 — Document

April 2019 — N6 — Power Machines

N6 2019 Nated Engineering

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🎯 100 marks ⏱️ 3h 📄 6 pages 📝 40 items found

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Q1— Section header —

1.1eat absorbed by the economiser in kJ/kg fuel (2\

1.2eat absorbed b y the superheater in kJ/kg fuel (2\

1.3eat absorbed by the evaporator in kJ/kg fuel (3\

1.4ryness fraction of the steam entering the superheater (4\

1.5emperature of the superheated steam leavi ng the superheater (4\

1.6ercentage of heat lost through the chimney and the percentage heat loss unaccounted for (5 [20 (8190046\

Q2— Section header —

2.1

2.2diab atic volumetric expansion ratio (2\

2.3Value of gamma (2\

2.4issing absolute tempe ratures at the principal points (8\

2.5Heat received in kJ/kg (4\ [20]20

Q3— Section header —

3.1Use scale 1 mm = 5 m/s and construct velocity diagrams for the turbine in the ANSWER BOOK. Indicate the lengths of ALL the lines as well as the magnitude of ALL the angles on the diagrams. (10 (8190046\

3.2Determine the following from the velocity diagrams: .2.1 nlet and outlet angles of the first row of moving blades

3.2nlet and outlet angles of the second row of moving blades

3.2nlet angle of the fixed blades

3.2ngle at which the gas leaves the turbine

3.2elocity of the gas leaving the first stage in m/s

3.2elocity of the gas leaving the fixed blades in m/s

3.2xial thrust developed in the turbine in N [20]20

Q4— Section header —

4.1At the throat of the nozzle:

4.1.1pecific enthalpy of the steam

4.1.2Velocity of the steam in m/s

4.1.3Specific volume of the steam

4.1.4Area in mm (4 3\ 12 (8190046\

4.2At the exit of the nozzle:

4.2.1Specific enthalpy of the steam (2\

4.2.2Dryness factor of the steam (3\

4.2.3Specific volume of the steam (3\ [20]20

Q5— Section header —

5.1ass of air delivered by the compressor in kg/min (3

5.2bsolute temperature of the air after compression in the low pressure cylinder (3

5.3bsolut e temperature of the air at the inlet to the high pressure cylinder (3

5.4For the low pressure cylinder:

5.4

5.4iameter of the piston in mm, and the stroke length in mm

5.520

Mark Allocation

Total100 marks

Sections20 + 20 + 20 + 20 = 80 marks

Paper information

TitleDocument

SubjectPower Machines

LevelN6

Document typeQuestion paper

Year2019

MonthApril

Pages11

Downloads5

Examination context

Decade2010s

Years ago7y

SeasonAutumn (SH)

Start dayMonday

Exam periodApril 2019

Days since exam2,751

About Power Machines examination preparation

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A practical revision approach

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