2010 HSC Engineering Studies Marking Guidelines

Transcription

1 00 HSC Engineering Studies Marking Guidelines Section I Question Answer A C 3 C 4 A 5 D 6 D 7 B 8 C 9 C 0 B

2 00 HSC Engineering Studies Marking Guidelines Section II Question (a) Relates a suitable application in engineering materials to a particular component Lists a suitable engineering material appropriate to the context of the development in lifts Question (b) Outlines roles of an engineer in terms of lift design and safe lift operation Lists roles OR Outlines ONE role Lists safety concerns to be addressed 3 Question (c) Outlines the impacts of lift technology on both people (society) and 3 building (the built environment) Lists TWO impacts of life technology on people and building OR Outlines ONE impact Lists one impact of lift technology Question (d) Describes a suitable method utilising hydraulics for modern lifts Lists a feasible method

3 00 HSC Engineering Studies Marking Guidelines Question (a) (i) Calculates the relevant forces correctly OR with minor error Calculates one relevant force correctly Question (a) (ii) Calculates the relevant force correctly OR with minor error Shows limited understanding of the concepts Question (a) (iii) Provides a well-structured explanation with appropriate reasoning Shows limited understanding of the concepts Question (b) (i) Recognises and gives a valid reason for the choice Question (b) (ii) Calculates correct answer depending upon which cross-sectional shape 3 used OR with minor error Uses correct formula but with major calculation mistakes Substitution into a relevant formula 3

4 00 HSC Engineering Studies Marking Guidelines Question 3 (a) (i) Correct material identified Question 3 (a) (ii) Correct description of process and sequence 3 Some correct features identified Provides one aspect of process Question 3 (b) (i) Correct response W sinθ N ( ) or V m s av ( ) OR Work (ΔPE) or Time (s/v) used in equation Question 3 (b) (ii) Correct response Correct substitution for P and V with error Question 3 (b) (iii) Correct response Correct substitution with one error 4

5 00 HSC Engineering Studies Marking Guidelines Question 4 (a) (i) States correct advantages States correct advantage Question 4 (a) (ii) Correct response ONE correct substitution into an appropriate formula OR concept of summing two appropriate forces Question 4 (b) (i) Correct answer calculated OR with minor error ONE correct substitution into an appropriate formula Question 4 (b) (ii) Selects a suitable material and gives relevant reasons Names ONE correct material OR gives one relevant reason Question 4 (c) Names and describes suitable test States one correct test OR describes a suitable test without name OR correct description and name of an inappropriate test 5

6 00 HSC Engineering Studies Marking Guidelines Question 5 (a) Describes, giving general reasons, why the internal combustion engine is preferred Lists a reason Question 5 (b) Explains clearly the operation of air brakes and effect on air flow Limited understanding of the operation of air brakes not connected with landing Question 5 (c) Compares use of composites using at least TWO factors Limited understanding of the use of composites compared to traditional materials Question 5 (d) Shows clear understanding of how the mechanical properties would be affected Shows limited understanding of how the mechanical properties would be affected Question 5 (e) Explains the advantage of Alclad Lists an advantage 6

7 00 HSC Engineering Studies Marking Guidelines Question 5 (f) Provides correct assembly AND proportion of components with correct 5 standards, or only minor errors Provides correct assembly AND proportion of components with some 4 errors Provides correct assembly AND proportion of components with 3 significant errors Provides basic assembly AND proportion of components Provides limited assembly AND proportion of components Question 6 (a) (i) Recognises and names correct medium used in the microwave link Question 6 (a) (ii) Indicates characteristics of a microwave communication link Lists one main characteristic of a microwave communication link Question 6 (a) (iii) Identifies the correct frequency Question 6 (b) (i) Provides characteristics and features of the sampling process consisting of a series of measurements taken at regular instants in time Indicates a series of measurements OR Indicates a measurement at some instant of time 7

8 00 HSC Engineering Studies Marking Guidelines Question 6 (b) (ii) Provides characteristics and features of the quantisation process States that quantisation is applying a measurement OR States that quantisation has discrete values Question 6 (b) (iii) Correctly identifies the quantisation level at most sampling instants Correctly applies the concepts of quantisation Question 6 (c) Provides a pictorial drawing in proportion AND correct shape 5 Provides a substantially correct pictorial drawing, mostly complete 4 Provides a pictorial drawing with several aspects correct 3 Provides a pictorial drawing with a few aspects correct Provides a limited AND/OR incomplete pictorial sketch 8

9 00 HSC Engineering Studies Marking Guidelines Section III Question 7 (a) (i) Identifies significant criteria that relate to the best selection Lists a criterion Question 7 (a) (ii) Compares TWO or more properties of timber and reinforced concrete poles Compares ONE property OR identifies properties without comparison Question 7 (a) (iii) Identifies ONE social AND ONE environmental impact Identifies ONE social OR ONE environmental impact Question 7 (b) (i) Explains differences in content of reports for TWO different stakeholders Explains differences in reports without specifying stakeholders Question 7 (b) (ii) Correctly explains the reduction in power loss by reducing current Only states that power loss is reduced without giving reason 9

10 00 HSC Engineering Studies Marking Guidelines Question 8 (a) (i) Considers a range of appropriate factors Lists ONE factor correctly Question 8 (a) (ii) Names and justifies TWO suitable materials 3 Names and justifies ONE suitable material OR Names TWO suitable materials Names ONE suitable material Question 8 (a) (iii) Calculates value correctly Question 8 (b) (i) Explains effect correctly referring to rotor current and back emf Explains some effect based on rotor current OR back emf Question 8 (b) (ii) Calculates back emf correctly Makes simple error in calculation OR Calculates the voltage drop 0

11 Engineering Studies 00 HSC Examination Mapping Grid Question Content Syllabus outcomes Section I Civil structures engineering mechanics and hydraulics: stress and H., H. strain - stress/strain diagram Civil structures engineering mechanics and hydraulics: stress and H., H. strain - stress/strain diagram 3 Lifting devices engineering materials: structure/property relationships in forming processes H., H. - forging 4 Personal and public transport engineering materials: polymers - structure/property relationships and H. applications 5 Civil structures engineering materials: composites - concrete (reinforced and prestressed) H., H. 6 Personal and public transport engineering mechanics and hydraulics: static friction - concept of H., H3. friction and its use in engineering 7 Personal and public transport engineering electricity electronics: control technology - digital H3., H6. technology 8 Personal and public transport engineering mechanics and hydraulics: stress and strain - shear H3. stress 9 Personal peers and public transport engineering electricity electronics: H3., H6. AC/DC circuits 0 Lifting devices engineering mechanics and hydraulics: fluid H3. mechanics - hydrostatic pressure Section II Question Historical and Societal Influences, and the Scope of the Profession (a) Historical and societal influences: engineering innovation H4. (b) 3 Scope of the profession: nature and range of work done H. (c) 3 Historical and societal influences: impact of civil structures on society H., H4.3 and the environment (d) Lifting devices engineering mechanics and hydraulics H6., H6., H6. Section II Question Civil Structures (a) (i) hydraulics truss analysis H3., H6., H6.

12 Question Content Syllabus outcomes (a) (ii) hydraulics truss analysis (a) (iii) hydraulics truss analysis: solve problems related to the design of civil structures (b) (i) hydraulics bending stress (b) (ii) 3 hydraulics bending stress: bending stress calculation Section II Question 3 Personal and Public Transport 3 (a) (i) Engineering materials choice of non-ferrous material 3 (a) (ii) 3 Engineering materials choice of non-ferrous processes hydraulics energy/power: 3 (b) (i) mathematical methods to solve engineering problems related to transport hydraulics energy/power: 3 (b) (ii) mathematical methods to solve engineering problems related to transport hydraulics energy/power: 3 (b) (iii) mathematical methods to solve engineering problems related to transport Section II Question 4 Lifting Devices Historical and societal influences 4 (a) (i) engineering innovation in lifting devices 4 (a) (ii) hydraulics use mathematical methods to solve problems related to lifting devices 4 (b) (i) hydraulics fluid mechanics: use mathematical methods to solve problems related to lifting devices Engineering materials properties, 4 (b) (ii) uses and appropriateness of materials used in lifting devices 4 (c) Engineering materials testing of materials used in lifting devices Section II Question 5 Aeronautical Engineering 5 (a) hydraulics propulsion systems 5 (b) hydraulics forces: lift, drag, weight, thrust H3., H3.3, H6., H6. H6. H6. H3. H., H. H., H. H3., H6., H6. H3., H6., H6. H3., H6., H6. H4., H4. H3., H6. H3., H6. H., H. H. H., H4. H.

13 Question Content Syllabus outcomes 5 (c) Engineering materials composites and aluminium and its alloys used in H. aircraft 5 (d) Engineering materials composites and aluminium and its alloys used in aircraft: heat treatment of applicable H. alloys 5 (e) Engineering materials corrosion H., H. 5 (f) 5 Communication pictorial and orthogonal projections: produce orthogonal drawings applying H3. appropriate Australian standards Section II Question 6 Telecommunication Engineering electricity/electronics 6 (a) (i) telecommunications: transmission H. media 6 (a) (ii) Engineering electricity/electronics telecommunications: transmission H., H. media - microwave 6 (a) (iii) Engineering electricity/electronics telecommunications: transmission media microwave: distinguish the H., H. communication bands in the electromagnetic spectrum 6 (b) (i) Engineering electricity/electronics telecommunications: analogue and H., H6. digital systems 6 (b) (ii) Engineering electricity/electronics telecommunications: analogue and H6. digital systems 6 (b) (iii) Engineering electricity/electronics telecommunications: analogue and H6. digital systems 6 (c) 5 Communication freehand and technical drawing, pictorial and H3. dimensioned Section III Question 7 Engineering and the Engineering Report 7 (a) (i) Civil Structures engineering materials: examine the properties, uses and appropriateness of materials used in civil structures H., H., H4. Engineering Report writing: analysis of an existing engineering application 7 (a) (ii) Civil Structures engineering materials: timber and concrete H. (reinforced and prestressed) 7 (a) (iii) Civil Structures historical and societal influences: critically examine the impact of civil H., H4.3 structures on society and the environment 7 (b) (i) Engineering Report writing H3. 3

14 Question Content Syllabus outcomes 7 (b) (ii) Personal and Public Transport engineering electricity/electronics: power generation/distribution electrical energy and power Section III Question 8 Engineering and the Engineering Report 8 (a) (i) 8 (a) (ii) 3 8 (a) (iii) 8 (b) (i) 8 (b) (ii) Aeronautical Engineering scope of the profession: describe the nature and range of work done in this profession Engineering report writing Analysis of an existing engineering application Aeronautical Engineering engineering materials: aluminium and its alloys used in aircraft, polymers Aeronautical Engineering engineering mechanics and hydraulics: forces (moments of a force), apply mathematical and graphical methods to solve flightrelated problems Personal and Public Transport engineering electricity/electronics: electric motors used in transport systems - principles, applications Lifting Devices engineering electricity/electronics: applications found in appropriate lifting devices motors, motor control Personal and Public Transport engineering electricity/electronics: electric motors used in transport systems - principles, applications, AC/DC circuits Lifting Devices engineering electricity/electronics: applications found in appropriate lifting devices motors, motor control H3., H6. H., H3., H4. H., H. H3., H6. H. H3., H6., H6. 4