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NSW HSC 2005 : ENGINEERING STUDIES

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2004 H I G H E R S C H O O L C E R T I F I C AT E E X A M I N AT I O N Engineering Studies Total marks 100 General Instructions Reading time 5 minutes Working time 3 hours Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A formulae sheet is provided at the back of this paper Write your Centre Number and Student Number at the top of pages 9, 11, 13, 17, 19, 23, 27 and 29 345 Section I Pages 2 7 10 marks Attempt Questions 1 10 Allow about 20 minutes for this section Section II Pages 9 26 70 marks Attempt Questions 11 16 Allow about 2 hours for this section Section III Pages 27 32 20 marks Attempt Questions 17 18 Allow about 40 minutes for this section Section I 10 marks Attempt Questions 1 10 Allow about 20 minutes for this section Use the multiple-choice answer sheet. Select the alternative A, B, C or D that best answers the question. Fill in the response oval completely. Sample: 2+4= (A) 2 A (B) 6 (C) 8 B C (D) 9 D If you think you have made a mistake, put a cross through the incorrect answer and fill in the new answer. A B C D If you change your mind and have crossed out what you consider to be the correct answer, then indicate the correct answer by writing the word correct and drawing an arrow as follows. correct A B C 2 D 1 Three concurrent forces in a state of equilibrium are shown. 30 P 30 Q R 250 N What will be the value of force Q? (A) 250 N (B) 289 N (C) 433 N (D) 577 N 2 A component is shown in the pictorial drawing. Which of the following drawings represents the half-section front view of the component? (A) (B) (C) (D) 3 3 Taking measurements from the orthogonal drawing, which of the following describes the bolt? (A) M16 4, length 50 (B) M20 2, length 50 (C) M20 4, length 50 (D) M20 4, length 64 4 Which forming process involves a low-melting point metal alloy being fed under pressure into a permanent metal mould? (A) Die casting (B) Blow moulding (C) Investment casting (D) Injection moulding 4 5 A steel cantilever beam is shown. Which sketch best represents the shape of the bending moment diagram for the beam, if the mass of the beam is uniformly distributed? (A) (C) 6 (B) (D) A 250 kN force is applied to the plates, as shown. 250 kN 250 kN What is the shear stress in the 20 mm bolt? (A) 199 MPa (B) 398 MPa (C) 796 MPa (D) 1592 MPa 5 7 A high-carbon steel punch is to be used to make holes in mild-steel sheet. What are the final heat-treatment processes required in the manufacture of the punch? (A) Normalising then hardening (B) Hardening then tempering (C) Normalising then tempering (D) Hardening then normalising 8 What is the major use of geotextiles in civil projects? (A) To inhibit weed growth (B) To prevent movement of subsoil layers (C) To strengthen concrete during pouring (D) To produce sail-like structures for shade 9 A traffic light will change to green for a vehicle if either: the pedestrian button is NOT pushed, OR the vehicle is waiting. Which simple logic circuit indicates this condition? (A) Pedestrian button Vehicle waiting Green (B) Pedestrian button Vehicle waiting Green (C) Pedestrian button Vehicle waiting Green (D) Pedestrian button Vehicle waiting Green 6 10 An AC to DC rectification circuit is shown. 240 V ~ + Which wave form would be displayed on the oscilloscope? (A) (B) (C) (D) 7 Oscilloscope BLANK PAGE 8 Board of Studies NSW 2004 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II 70 marks Attempt Questions 11 16 Allow about 2 hours for this section Student Number Answer the questions in the spaces provided. Marks Question 11 Historical and Societal Influences, and the Scope of the Profession (10 marks) (a) Aeronautical engineers may be employed in applications not directly related to aircraft design. Explain how specific areas of knowledge of the aeronautical engineer may be applied to: yacht design, OR racing car design. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Question 11 continues on page 10 346 9 4 Marks Question 11 (continued) (b) Explain how the application of electronic control technology has improved EITHER braking efficiency OR engine efficiency in the modern motor vehicle. 3 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (c) Identify a technological change in personal or public transport, and explain the environmental effect of this change. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... End of Question 11 10 Board of Studies NSW 2004 3 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II (continued) Student Number Marks Question 12 Civil Structures (10 marks) (a) Typically, a railway station is a combination of a reinforced concrete edging and an asphalt platform. (i) Identify the constituents of asphalt, and explain their function. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Explain, in terms of their properties, why reinforced concrete and asphalt are used as indicated in the cross-sectional representation of a train platform. Asphalt Reinforced concrete Soil fill Footing ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 12 continues on page 12 347 11 3 Marks Question 12 (continued) (b) The truss shown is used to support the roof of a railway station platform shelter. The truss also supports a train indicator and a clock. The truss has a weight of 4 kN acting through its centre of mass. All members are 2 metres in length. 10 m Weight of indicator 450 N Weight of clock 190 N Member A Support 1 (i) Support 2 Determine the reaction in Support 1. 2 Reaction in Support 1 = ................................... N (ii) Determine the magnitude and nature of the force in Member A. Magnitude of force in Member A = ................................... N Nature of force in Member A = ....................................... End of Question 12 12 Board of Studies NSW 2004 3 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II (continued) Student Number Marks Question 13 Personal and Public Transport (10 marks) (a) A suitcase weighing 300 N is to be pulled up an inclined ramp as shown. The coefficient of static friction between the suitcase and ramp is 0.3. Force P acts parallel to the ramp. P 20 Determine the minimum value of force P required to start the suitcase moving up the ramp. P = ................................... N Question 13 continues on page 14 348 13 2 Marks Question 13 (continued) (b) An exploded drawing of an experimental wheel and axle assembly for a passenger train carriage is shown. During preliminary testing, failure was found to occur in Region A. Wheel Axle Region A (i) Explain why the failure occurred, and outline how Region A could be redesigned to overcome the tendency to fail. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Describe a suitable non-destructive test that will detect early signs of possible wheel failure in Region A. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 13 continues on page 15 14 2 Marks Question 13 (continued) (c) The tensioning system for overhead power cables of an electric train network is shown in the photograph. Overhead power cable Counterweight Insulating discs (i) Determine the resultant tension in the overhead power cable when the counterweight has a total mass of 1.2 tonnes. 2 Tension = ................................... N (ii) Name a suitable material for the manufacture of the insulating discs. Explain in terms of the material s structure why it is an insulator. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... End of Question 13 15 2 BLANK PAGE 16 Board of Studies NSW 2004 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II (continued) Student Number Marks Question 14 Lifting Devices (10 marks) (a) A crane uses a DC electric motor to lift a mass of 250 kg vertically from the ground. After 18 seconds the mass is 20 metres off the ground with an upward velocity of 2 ms 1. (i) Determine the average power required by the motor to perform this lifting operation. 3 Power = ................................ kW (ii) Explain the function of a commutator in a DC motor. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 14 continues on page 18 349 17 2 Marks Question 14 (continued) (b) Replaceable tines used on excavation buckets are made from a low-carbon steel by a drop-forging process, followed by heat treatment. Tine (i) Describe the drop-forging process. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) The service properties of the tine require it to be abrasion resistant and tough. Describe a suitable heat treatment process and the resultant change in structure in the tine. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... End of Question 14 18 Board of Studies NSW 2004 3 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II (continued) Student Number Marks Question 15 Aeronautical Engineering (15 marks) (a) (i) Explain the reason for having the replaceable leading edge on the timber propeller shown in the photograph. 2 ................................................................... ................................................................... ................................................................... ................................................................... ................................................................... ................................................................... ................................................................... (ii) With reference to Bernoulli s Principle, explain why propeller blades have an aerofoil-shaped cross-section. Diagrams may be used to assist in your answer. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 15 continues on page 20 350 19 3 Marks Question 15 (continued) (b) Details of a flaps control arm for a light aircraft are given. 4 olt b head oom5 dle Han arm ever 5 L hr Mus 7 x1.5 M10 R15 s 10 le 3 ho gh 15 rou 10 th 30 x1.5 x1.5 M10 D, 20 O 200 ers wash ick 4 th ,2 10 ID 1S 5 5 0x1. s M1 bolt head head m hroo ical Mus 2 Spher 31 ,R 20 20 5 50 il o Deta 39 R10 ad he Bulk 0 s 1 d hole e presse 2r ua 2 sq 10x1.5 d M a nuts o bulkhe t fixed 0 s 1 d 10 ts M d nu e ress ep quar le 2 ho e en cabl f Full read th R15 te pla ting oca L R5 10 Top view of locating plate R6 R3 10 18 10 3 12 1 M5x head 20 72 22 20 herical Sp R12 30 Question 15 continues on page 21 20 30 Question 15 (continued) A partially completed orthogonal sketch of the front view of the assembly is shown, drawn to a scale of 1 : 1. Complete the assembled orthogonal sketch of the flaps control arm in the space provided. The handle is to be fully sectioned. Apply AS1100 drawing standards where appropriate. Do NOT show hidden outline. Do NOT dimension. Question 15 continues on page 22 21 Marks Question 15 (continued) (c) (i) Identify TWO innovations in the aeronautics industry, and explain how these have affected society. 4 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Double-acting, or two-way hydraulic rams are used in many aircraft to control moveable components. The diagrams below represent the ram operating in opposite directions. Reservoir and pump Reservoir and pump Force 1 Force 2 Explain why Force 1 is greater than Force 2 when the same hydraulic pressure is used in the system. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... End of Question 15 22 Board of Studies NSW 2004 2 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section II (continued) Student Number Marks Question 16 Telecommunication (15 marks) (a) The key elements of a digital telecommunication system are shown in the diagram. The modulator and demodulator permit the transmission of digital information over a high-frequency channel. Analogue signal Analogue to digital converter Modulator High-frequency channel Analogue signal (i) Digital to analogue converter Demodulator Describe the process of frequency modulation. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Explain why frequency modulation is preferred over amplitude modulation in a modern telecommunication system. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 16 continues on page 24 351 23 2 Marks Question 16 (continued) (b) (i) Satellites can be found in synchronous (geosynchronous) and asynchronous orbits. 3 Explain the difference between the two orbits, and indicate a satellite use for each orbit. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) A multimedia broadcast (sound and vision) from a remote location via satellite has a limited bandwidth. Describe the effect of the limited bandwidth on reception of the broadcast. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 16 continues on page 25 24 2 Marks Question 16 (continued) (c) The orthogonal assembly drawing gives details of a cable support bracket for a telecommunication tower. Cable end Pin Base plate (i) Taking sizes from the assembled orthogonal drawing, sketch a pictorial view of the pin assembled into the base plate when viewed in the direction of the arrow. Do NOT draw the cable end. Question 16 continues on page 26 25 3 Marks Question 16 (continued) (ii) The cable has a length of 60 metres and is permitted to undergo a maximum axial extension of 200 mm. The modulus of elasticity for the cable is 210 GPa. Determine the maximum allowable tensile stress for the cable. Maximum allowable tensile stress = .............................. MPa End of Question 16 26 Board of Studies NSW 2004 3 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section III 20 marks Attempt Questions 17 18 Allow about 40 minutes for this section Student Number Answer the questions in the spaces provided. Marks Question 17 Engineering and the Engineering Report (10 marks) Modern metal-framed bus shelters are replacing the older masonry and timber-framed shelters, similar to the styles shown in the photographs. Older style bus shelter (a) Modern style bus shelter Outline TWO social factors that have influenced this change of style. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Question 17 continues on page 28 352 27 2 Marks Question 17 (continued) (b) (i) Timber was used as a construction material in older style shelters. Outline the reasons for this choice of material. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Suggest a suitable material that could be used for the frame of the modern style shelter. Justify the choice of material. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... (c) Explain TWO different types of corrosion that may occur on the modern style shelter. Identify where these potential corrosion sites will occur. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... End of Question 17 28 Board of Studies NSW 2004 4 2 004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies Centre Number Section III (continued) Student Number Marks Question 18 Engineering and the Engineering Report (10 marks) (a) A cantilever beam used in the roof structure of a modern bus shelter may be selected from a variety of cross-sectional shapes. Design specifications require a maximum bending moment of 750 Nm for this beam. Using the table supplied: select the beam that will support the greatest load, and calculate the maximum stress for the selected beam. Ymax Ixx(m4) Ymax(m) Cross-sectional area (m2) A 1.688 10 6 0.050 1.492 10 3 29 621 B 1.412 10 6 0.040 1.500 10 3 28 329 C 2.459 10 6 0.065 1.492 10 3 26 433 D 0.916 10 6 0.035 1.492 10 3 38 209 E 1.269 10 6 0.040 1.500 10 3 31 521 Beam Cross-sectional shape Ixx (m 3) Beam selected: ......................................... Maximum stress = ....................................... Question 18 continues on page 30 353 29 3 Marks Question 18 (continued) (b) We strive to maintain accuracy in this table. However, errors may occur and the end user assumes all risk and liability from its use. This statement, or similar ones, are often found attached to commercially provided engineering tables. Discuss the implications of this statement for the engineer. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Question 18 continues on page 31 30 2 Marks Question 18 (continued) (c) (i) Tempered glass was chosen as the material to be used for the clear vertical panels in this bus shelter. Laminated glass and polycarbonate sheet were also considered. Justify the selection of tempered glass in preference to laminated glass and polycarbonate sheet. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... Question 18 continues on page 32 31 3 Marks Question 18 (continued) (ii) The roofing panels are supported by cantilevered beams which are attached to the vertical supports. The cross-sectional areas of these beams taper significantly from the rear to the front. Explain the structural reason for tapering these beams. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... End of paper 32 Board of Studies NSW 2004 2 2004 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Engineering Studies FORMULAE SHEET Force, Moments F = ma; M = Fd Fx = 0; If a body is in equilibrium, then Fy = 0; M = 0 Friction F = N; = tan Energy, Work, Power KE = 1 mv 2 ; 2 PE = mgh; W = Fs = PE + KE; P= Pressure P= F ; A P = Po + gh Stress and Strain = F ; A = allowable = e ; L yield F of S E= ; (Ductile); = My I allowable = Machines MA = 354 L ; E VR = dE dL ; = MA VR 33 UTS F of S (Brittle) W t BLANK PAGE 34 Board of Studies NSW 2004

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Additional Info : New South Wales Higher School Certificate Engineering Studies 2005
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