2009-hsc-exam-engineering-studies

# 2009-hsc-exam-engine - 2009 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

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2009± HIGHER SCHOOL CERTIFICATE± EXAMINATION± Engineering Studies± 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, 15, 17, 19, 23, 27 and 29 Total marks – 100 Section I Pages 2–6 10 marks • Attempt Questions 1–10 • Allow about 20 minutes for this section Section II Pages 9–25 70 marks • Attempt Questions 11–16 • Allow about 2 hours for this section Section III Pages 27–31 20 marks • Attempt Questions 17–18 • Allow about 40 minutes for this section 345

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Section I 10 marks Attempt Questions 1–10 Allow about 20 minutes for this section Use the multiple-choice answer sheet for Questions 1–10. 1 Which property is measured by an Izod impact test? (A) Hardness (B) Malleability (C) Notch toughness (D) Compression strength 2 A 4 kg lamp is suspended at the centre of a wire as shown. Lamp 30° 30° What is the tension in the wire? (A) 20.0 N (B) 34.4 N (C) 40.0 N (D) 68.8 N – 2 –
ae f b dh g c da cb gf he 3 The orthogonal views represent a hollow transition piece from square tube to rectangular tube. Which of the following diagrams represents the development of the transition piece? (A) (C) (B) (D) – 3 – 4 In a permanent magnet DC motor, the direction of rotation can be changed by (A) reducing the supply voltage. (B) reducing the armature current. (C) reversing the polarity of the stator current. (D) reversing the polarity of the supply voltage.

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5 A cantilevered beam is supported by two wire stays. TO P VIEW FRONT VIEW Scale 1 : 100 What is the true length of each of the stays? (A) 70 mm (B) 80 mm (C) 7.0 m (D) 8.0 m – 4 –
6 A box is placed on an inclined plane as shown. The coefficient of friction, μ , is equal to 0.33. 20° Which statement is true? (A) The box will remain stationary. (B) The box will accelerate down the plane. (C) The box will move down the plane at a constant rate. (D) The box will move down the plane at a decreasing rate. 7 Which two mechanical properties would be most desirable in a steel trailer suspension spring? (A) Hardness and toughness (B) Toughness and weldability (C) Weldability and resilience (D) Resilience and high yield strength 8 The equivalent DC voltage of an AC voltage is (A) 0.500 times the peak AC voltage. (B) 0.707 times the peak AC voltage. (C) 1.412 times the peak AC voltage. (D) 3.000 times the peak AC voltage. 9 A copper water pipe is attached to a wooden fence with a pressed mild steel saddle. The pipe and saddle are frequently wet. In this situation the copper pipe will (A) have the higher positive potential and corrode. (B) cathodically protect the saddle from corroding. (C) form a sacrificial anode and protect the saddle from corroding.

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## This note was uploaded on 03/07/2010 for the course GENERAL MA General Ma taught by Professor Not sure during the Spring '10 term at École Normale Supérieure.

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2009-hsc-exam-engine - 2009 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

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