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

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ADVANCED SUBSIDIARY (AS) General Certificate of Education 2009 Technology and Design assessing Unit 3 Systems and Control: Industrial and Commercial Practices ASV31 Assessment Unit AS 3 [ASV31] FRIDAY 12 JUNE, 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 3(b), (c) and (d) 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. 4690 1 (a) A voltage divider circuit is shown in Fig. 1(a). 6V R1 R2 5k6 V 0V Fig. 1(a) (i) State the name of the component R1 in Fig. 1(a). [1] (ii) The resistance of component R1 in Fig. 1(a) is 20 k in low level light conditions and 2 k in high level light conditions. Calculate the value of the voltage V for both lighting conditions. [4] (iii) The voltage divider circuit shown in Fig. 1(a) could be used in conjunction with a comparator to make a light level warning device. Using a comparator based system, draw a complete circuit that will switch on a buzzer when light levels are low. [5] (b) Fig. 1(b) shows an electronic timing circuit. 6V R1 R2 100k Vcc Reset R3 Trigger Threshold S1 Output Discharge Ground C 470 F 0V Fig. 1(b) 4690 2 [Turn over (i) Describe the operation of the circuit shown in Fig. 1(b) after switch S1 has been pressed momentarily. [3] (ii) Sketch and label the output waveform for the circuit in Fig. 1(b) given that T = 1.1C R2, where T is the time period, in seconds, of the output waveform. (iii) The timing action produced by the circuit in Fig. 1(b) could be produced using a programmable system. State one advantage and one disadvantage of using a programmable system for this application. 4690 [4] [2] 3 [Turn over 2 Fig. 2(a) shows a prototype wheelbarrow. (a) (i) State the class of lever employed in a wheelbarrow. [1] (ii) Calculate the effort required to move a 300 N load if the mechanical advantage is 3. [2] (iii) Calculate the velocity ratio of the wheelbarrow if the distance moved by the load is 120 mm and effort moves 360 mm. [2] Effort Load Fig. 2(a) (b) Fig. 2(b) shows various mechanical components assembled for testing. (i) State the direction of rotation at G if A rotates in an anticlockwise direction. [2] (ii) Calculate the velocity ratio between pulleys A and G. [4] (iii) Name and draw a suitable system that will link the motor shaft Y and shaft X. [4] (iv) Using an annotated sketch describe how a pulley could be attached to a shaft using a key and keyway. [3] (v) Shaft M is to be attached to a crank and slider mechanism to produce a reciprocating output. State one other method used to convert rotary motion to reciprocating. [1] 4690 4 [Turn over E 50 Teeth D 25 Teeth C 50 Teeth A Diameter 70 mm F Diameter 30 mm Shaft Y B Diameter 35 mm Shaft X G Diameter 60 mm Motor Shaft M Fig. 2(b) 4690 5 [Turn over 3 Fig. 3 shows part of an incomplete pneumatic system. (a) (i) Name the activation method at A. [1] (ii) Name the activation method at B. [1] (iii) Briefly outline one main difference between activating a diaphragm operated valve and a pilot operated valve. [2] (b) On the pro forma provided (answer number 3(b), (c) and (d)), complete the circuit enabling B and C to outstroke the double acting cylinder. [3] (c) On the pro forma provided (answer number 3(b), (c) and (d)), complete the circuit enabling the double acting cylinder to automatically instroke, slowly, following an outstroke. [4] (d) On the pro forma provided (answer number 3(b), (c) and (d)), complete the circuit enabling the double acting cylinder to outstroke following a delay in time after A is activated. [5] (e) The double acting cylinder is supplied with an air pressure of 0.4 N/mm2, has a piston diameter of 60 mm and a piston rod diameter of 6 mm. Calculate the force produced by the cylinder during the instroke. Please assume = 3.14. [3] 4690 6 [Turn over 2 4 12 14 5 A 1 3 B C Fig. 3 4690 7 [Turn over 938-008-1 4690 0 8 [Turn over

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Additional Info : Gce Technology and Design June 2009 AS 3, Unit 3 – Systems and Control: Industrial and Commercial Practices
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