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GCE JUN 2007 : (AS 3) Systems and Control: Industrial and Commercial Practices

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ADVANCED SUBSIDIARY (AS) General Certificate of Education 2007 Technology and Design assessing Unit 3 Systems and Control: Industrial and Commercial Practices ASV31 Assessment Unit AS 3 [ASV31] TUESDAY 19 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 pages provided. Answer all three questions. Answers to questions 2(b)(ii) and 3(c)(i), (ii) and (iii) should be made on the A3 pro forma answer pages provided. 1 - 26.04.06ML 2 - 13.07.06BP 3 - 30-10-06RR 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. ASV3S7 2711 1 (a) Fig. 1(a) shows a part of an electronic timing circuit. 5V R1 100 K 8 R2 2K2 Vcc 2 6 S1 Trigger Threshold Discharge 7 Ground 1 C 470 F 4 Reset Output 3 Vout 0V Fig. 1(a) (i) Component C in Fig. 1(a) is an electrolytic capacitor. State one main feature of this type of capacitor that makes it suitable for the application shown. [1] (ii) Briefly explain the operation of the circuit in Fig. 1(a) when switch S1 is momentarily closed. [3] (iii) Given that T = 1.1 C R (R = R1 + R2) and T is the time that the voltage Vout is high. Calculate the minimum and maximum values for T for the circuit shown in Fig. 1(a). [4] (iv) The output from the circuit shown in Fig. 1(a) is connected to a transistor and bulb arrangement as shown in Fig. 1(b). The bulb requires 80 mA in order to be illuminated. 3 - 30-10-06RR 5V 2 - 13.07.06BP From Fig. 1(a) output Rb 0V 1 - 26.04.06ML Fig. 1(b) ASV3S7 2711 If the transistor has a current gain of 100 and a VBE of 0.7 V, calculate the value of Rb needed to illuminate the bulb when the output from the circuit in Fig. 1(a) is high. [2] 2 [Turn over (b) A logic circuit is shown in Fig. 1(c). 5V A R1 B Q R2 C R4 100 R3 0V Fig. 1(c) (i) State the purpose of resistors R1, R2 and R3 in Fig. 1(c). [1] (ii) Draw a truth table for all the input combinations of A, B and C and the corresponding output Q, for the logic circuit shown in Fig. 1(c). [4] (iii) State a single logic gate that could replace the logic gates in Fig. 1(c). [1] (iv) The LED in Fig. 1(c) is rated at 2.2 V. Calculate the current in the LED when it is illuminated. [3] ASV3S7 2711 3 [Turn over 2 (a) Fig. 2(a) shows part of a braking system. When the handle is pushed downwards the brake pad presses against the braking wheel, reducing its rotating speed. (i) State the class of lever used in the braking system. [1] (ii) State what is meant by the term moment of a force. [2] (iii) Calculate the effort required if the load is 300 N and the mechanical advantage of the braking system is 3. [2] Pivot Effort Brake Pad Handle Load Braking Wheel Fig. 2(a) (b) Fig. 2(b) shows an incomplete powered saw. The motor turns Shaft M and the Blade is intended to move forwards and backwards in a straight path. (i) State the types of motion of Shaft M and the Blade. [1] (ii) On the pro forma provided (answer number 2(b)(ii)), name and draw a suitable mechanism to allow the Blade to move forwards and backwards as Shaft M rotates. [3] Saw 2 - 13.07.06BP 3 - 30-10-06RR Shaft M Motor 1 - 26.04.06ML Blade Fig. 2(b) ASV3S7 2711 4 [Turn over (c) Fig. 2(c) shows part of a mechanical system which moves a rack when the motor rotates. (i) Calculate the output speed of pulley R if the motor rotates at 240 rev/min. [3] (ii) Calculate the velocity ratio between pulley A and gear E. [3] (iii) Calculate the linear movement of the rack if gear E makes four rotations. A 180 degree rotation of the pinion gear moves the rack 160 mm. [4] E 25 Teeth F A C D 80 Teeth Diameter 100 mm 80 Teeth Diameter 30 mm Motor B Q Diameter 25 mm Diameter 75 mm Pinion Rack R G Diameter 150 mm 3 - 30-10-06RR Diameter 60 mm 1 - 26.04.06ML 2 - 13.07.06BP Fig. 2(c) ASV3S7 2711 5 [Turn over 3 Fig. 3(a) shows part of an incomplete pneumatic circuit. 14 12 3 5 3 - 30-10-06RR 1 A C Port 3 1 - 26.04.06ML 2 - 13.07.06BP B Fig. 3(a) ASV3S7 2711 6 [Turn over (a) (i) Name the activation method at A. [1] (ii) State the purpose of port 3 at C. [1] (b) The compressed air supplied to these components has been prepared for use. Briefly describe the function of regulator and lubrication units. [2] (c) (i) On the pro forma provided (answer number 3(c)(i), (ii) and (iii)), complete the circuit to enable the single acting cylinder to outstroke once A and B and C have been activated. [4] (ii) On the pro forma provided (answer number 3(c)(i), (ii) and (iii)), add any necessary components and complete the circuit to enable the single acting cylinder to outstroke and instroke slowly. [3] (iii) On the pro forma provided (answer number 3(c)(i), (ii) and (iii)), add any necessary components and complete the circuit to enable the double acting cylinder to instroke following an outstroke. [5] (d) The single acting cylinder shown in Fig. 3(a) is required to produce a positive force of 212 N using an air pressure of 0.4 N/mm2. Choose by appropriate calculation one of the following single acting cylinders which could best meet the requirement: Cylinder P piston diameter 12 mm Cylinder Q piston diameter 18 mm Cylinder R piston diameter 26 mm Cylinder S piston diameter 30 mm Cylinder T piston diameter 34 mm [3] 1 - 26.04.06ML 2 - 13.07.06BP 3 - 30-10-06RR Assume = 3.14 ASV3S7 2711 7 [Turn [Turn over 3 - 30-10-06RR 2 - 13.07.06BP 1 - 26.04.06ML A 5/06 7-069-1 S SV3S7 2711 8 [Turn over [Turn over ASV31 2711.02 INS 1 Question No. 2(b)(ii) Motor Pro forma answer page (answer number 2(b)(ii)) Shaft M Saw Blade ADVANCED SUBSIDIARY (AS) TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 Summer 2007 ASV31 Candidate Number 71 Centre Number ASV31 2711.02 INS 2 Question No. 3(c)(i), (ii) and (iii) 5 1 A 3 14 B C Pro forma answer page (answer number 3(c)(i), (ii) and (iii)) 12 ADVANCED LEVEL TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 Summer 2007 ASV31 Candidate Number 71 Centre Number

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Additional Info : Gce Technology and Design June 2007 AS 3, Unit 3 – Systems and Control: Industrial and Commercial Practices
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