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GCE JAN 2009 : (AS 3) Systems and Control: Industrial and Commercial Practices

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ADVANCED SUBSIDIARY (AS) General Certificate of Education January 2009 Technology and Design assessing Unit 3 Systems and Control: Industrial and Commercial Practices ASV31 Assessment Unit AS 3 [ASV31] WEDNESDAY 28 JANUARY, MORNING 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 pages provided. Answer all three questions. Answers to questions 2(b) and 3(d) and (e) should be made on the A3 pro forma answer pages 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 pages securely to the Answer Booklet with the treasury tag supplied. 4317 1 Three logic gates are shown in Fig. 1(a). B A C Fig. 1(a) (a) Name the logic gates labelled A, B and C in Fig. 1(a). [3] (b) Fig. 1(b) shows a switch and resistor arrangement that could provide inputs to a logic circuit. 5V R1 R2 To logic circuit SW1 SW2 0V Fig. 1(b) (i) Briefly explain the function of the resistors R1 and R2 as shown in Fig. 1(b). [2] (ii) Draw and label an SR flip flop based on logic gates and briefly explain its action. [4] 4317 4317 2 [Turn over (c) A prototype light sensing circuit is shown in Fig. 1(c) which was found to respond to changes in the light conditions. 6V R1 R4 LED R3 TR1 R2 V1 0V Fig. 1(c) (i) State the name of the component R1 in the circuit shown in Fig. 1(c) and briefly explain its purpose in the circuit. [2] (ii) Describe the operation of the circuit when the light conditions change from bright light to darkness. [2] (iii) Calculate the required resistance of R1 in Fig. 1(c) to enable the voltage V1 to equal a value of 4.2 Volts if the resistance of R2 is 20 k . [3] (iv) The maximum LED current in Fig. 1(c) is limited at 20 mA when resistor R3 is 10 k . Calculate a suitable gain (hFE) for the transistor TR1. (Assume V1 is 4.2 V and Vbe is 0.6 V). [3] 4317 3 [Turn over 2 Fig. 2(a) shows various mechanical components assembled for testing. (a) (i) Name the mechanical component used at H. [1] (ii) State the direction of rotation at E if A rotates in a clockwise rotation. [1] (iii) Calculate the velocity ratio from A to I. [3] (iv) Calculate the output speed at G if the motor rotates at 480 rev/min. [4] (v) During testing, the pulley belt between F and G was found to slip. Using an annotated sketch, name and draw a component which could be added to prevent the slippage. [3] 4317 4 [Turn over B 30 Teeth C 40 Teeth A 60 Teeth D 80 Teeth I 60 Teeth Motor 480 rev/min H 30 Teeth F Dia 80 mm G Dia 160 mm E 80 Teeth Fig. (2)(a) 4317 5 [Turn over (b) Fig. 2(b) shows part of a raising/lowering mechanism to be added to a camera tripod. On the pro forma provided (answer number 2(b)), name and draw the mechanism to allow the lever handle to raise and lower the camera avoiding slippage. [4] Camera Lever Handle Raising/Lowering Shaft Fig. (2)(b) (c) A mechanical system has an efficiency of 80% and a mechanical advantage of 4. Showing all calculations, determine the velocity ratio of the system. 4317 6 [3] [Turn over BLANK PAGE (Questions continue overleaf) 4317 7 [Turn over 3 (a) Name the following components as shown on Fig. 3: (i) X. [1] (ii) Y. [1] (b) The compressed air supplied to these components has been prepared for use. Briefly describe the main function of filter and lubricator units. [2] (c) Briefly describe how the double acting cylinder shown on Fig. 3 instrokes following an outward stroke. [4] (d) On the pro forma provided (answer number 3(d) and (e)), complete the circuit enabling the double acting cylinder to go positive if either A or B or C is activated. [4] (e) On the proforma provided (answer number 3(d) and (e)), complete the circuit to enable the double acting cylinder to outstroke and instroke slowly. [3] (f) The double acting cylinder with an air supply of 0.5 N/mm2 is expected to produce a force of 1256.75 N during the instroke. Calculate the piston area during the outstroke if the piston rod radius is 5 mm. Please assume = 3.14. 4317 8 [4] [Turn over Y 1 2 2 4 12 X 14 5 3 1 B A C Fig. 3 THIS IS THE END OF THE QUESTION PAPER 4317 9 [Turn over ASV3W9 4317 10 [Turn over ASV3W9 4317 11 [Turn over 935-015-1 4317 0 12 [Turn over 4317.02 Question No. 2(b) Pro forma answer page (answer number 2(b)) ADVANCED SUBSIDIARY (AS) TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 January 2009 ASV31 Candidate Number 71 Centre Number 4317.02 Question No. 3(d) and (e) 2 12 5 4 B 1 3 2 14 Pro forma answer page (answer number 3(d) and (e)) A 1 C ADVANCED SUBSIDIARY (AS) TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 January 2009 ASV31 Candidate Number 71 Centre Number

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Additional Info : Gce Technology and Design January 2009 Assessment Unit 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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