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GCE JUN 2006 : (AS 3) Systems and Control: Industrial and Commercial Practices

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ADVANCED SUBSIDIARY (AS) General Certificate of Education 2006 Technology and Design assessing Unit 3 Systems and Control: Industrial and Commercial Practices ASV31 Assessment Unit AS 3 [ASV31] TUESDAY 20 JUNE, AFTERNOON TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number on the Answer Booklet provided and on the A3 pro forma answer page provided. Answer all three questions. Answers to questions 3(c) and 3(e) should be made on the A3 pro forma answer page provided. INFORMATION FOR CANDIDATES The total mark for this paper is 60, including a maximum of 3 marks for quality of written communication. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each question or part question. At the conclusion of the examination, attach the A3 pro forma answer page securely to the Answer Booklet with the treasury tag supplied. ASV3S6 1576 1 (a) A student has designed a steady hand game which consists of a shaped wire and a metal wand. Part of the circuit to control the game is shown in Fig. 1(a). If the wand touches the shaped wire momentarily the output Q will be high . The output will remain high until the reset switch is pressed. 9V R1 R2 S Wand Shaped wire Q R Reset switch 0V Fig. 1(a) (i) Name the arrangement of logic gates shown in Fig. 1(a). [1] (ii) The table in Fig. 1(b) shows the sequence of operations from Stage 1 to Stage 4 when using the circuit in Fig. 1(a). Deduce the missing logic states for S, R and Q respectively. Stage Wand and shaped wire contact? Yes/No Reset switch S Logic state R Logic state Q Logic state 1 No Open 1 1 0 2 Yes Open 0 1 ? 3 No Open ? 1 1 4 No Closed 1 ? 0 [3] Fig. 1(b) (iii) An alternative circuit for the steady hand game could be constructed using a thyristor as the main control component. Design a thyristor based circuit, showing clearly where the reset switch, wand and shaped wire would be connected. [5] ASV3S6 1576 2 [Turn over (b) An astable circuit, used to provide a control signal is shown in Fig. 1(c). The circuit uses a 555 timer and external components R1, R2 and C. 5V R1 220 K Vcc Discharge Reset R2 470 K C Threshold + Trigger Out Ground 10 F 0V Fig. 1(c) (i) State why the components R1, R2 and C are not supplied with the 555 timer when you purchase it. [1] (ii) The circuit in Fig. 1(c) uses an electrolytic type capacitor. State one advantage and one disadvantage of using this type of capacitor. [2] (iii) Calculate the frequency of the circuit shown in Fig. 1(c) given that the time period T of the output is given by T = C (R1 + 2R2)/1.44. [3] (iv) Sketch the output waveform for the astable circuit in Fig. 1(c). Indicate the mark and the space on the waveform. [4] ASV3S6 1576 3 [Turn over 2 (a) Fig. 2(a) shows a cam and follower mechanism. (i) State the type of follower shown. [1] (ii) State the type of cam shown. [1] (iii) Briefly explain what is meant by the term dwell when associated with cams. [2] follower cam Fig. 2(a) (b) Fig. 2(b) opposite shows a gear and pulley based mechanical system. (i) Name the gear mechanism shown at Z. [1] (ii) State the direction of rotation at G if A rotates in a clockwise rotation. [1] (iii) Calculate the Velocity Ratio between A and G. Please use the sizes for gears and pulleys as shown on Fig. 2(b). [4] (iv) Calculate the number of teeth at E if the Velocity Ratio between C and E is changed to 3. [2] (c) In your answer booklet name and draw a suitable system that will link the motor shaft P and shaft Q on Fig. 2(b). [3] (d) (i) Grub screws, keys and keyways are commonly used to secure components to shafts. State one other securing method. [1] (ii) During testing the pulley belt between pulleys A and B was found to slip. Using an annotated sketch name and draw a method/device which could be added to prevent the slippage. [3] ASV3S6 1576 4 [Turn over ASV3S6 1576 5 [Turn over Z G Diameter 60 mm F Diameter 30 mm D 25 Teeth B Diameter 25 mm E 60 Teeth Fig. 2(b) Shaft Q C 60 Teeth A Diameter 100 mm Motor Shaft P 3 (a) Name the following components as shown on Fig. 3 opposite: (i) X. [1] (ii) Y. [1] (b) Briefly describe the main operation of a typical compressor installation. [3] (c) On the pro forma provided (answer number 3(c) and (e)) complete the circuit enabling the double acting cylinder to go positive if either A or B or C is activated. [4] (d) Briefly describe how the double acting cylinder shown on Fig. 3 instrokes following an outstroke. [4] (e) On the pro forma provided (answer number 3(c) and (e)) draw a circuit to enable the valve at C to be activated once switch S is pushed. [2] (f) The double acting cylinder is supplied with an air pressure of 0.4 N/mm2 and has a piston diameter of 40 mm. Calculate a piston diameter for a new double acting cylinder if the force exerted during the outstroke is to be increased by 282.6 N. Assume = 3.14 and the air pressure remains unchanged. [4] ASV3S6 1576 6 [Turn over X 1 2 Y 4 A 2 12 14 5 1 3 B S C Fig. 3 ASV3S6 1576 7 [Turn over Permission to reproduce all copyright material has been applied for. In some cases, efforts to contact copyright holders may have been unsuccessful and CCEA will be happy to rectify any omissions of acknowledgement in future if notified. S 9/05 2300 302507(107) ASV3S6 8 [Turn over

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Additional Info : Gce Technology and Design June 2006 AS 3, Unit 3 – Systems and Control: Industrial and Commercial Practices
Tags : General Certificate of Education, A Level and AS Level, uk, council for the curriculum examinations and assessment, gce exam papers, gce a level and as level exam papers , gce past questions and answer, gce past question papers, ccea gce past papers, gce ccea past papers

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