
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

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

16 pages, 22 questions, 0 questions with responses, 0 total responses,

	gce	+Fave Message
	Profile Timeline Uploads Q & A

Home > gce >

Instantly get Model Answers to questions on this ResPaper. Try now!
NEW ResPaper Exclusive!

Formatting page ...

ADVANCED SUBSIDIARY (AS) General Certificate of Education January 2007 Technology and Design assessing Unit 3 Systems and Control: Industrial and Commercial Practices ASV31 Assessment Unit AS 3 [ASV31] TUESDAY 30 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 Question 2(b) and Question 3(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. ASV3W7 2222 1 (a) Fig. 1(a) shows an electronic timing circuit. SPST switch D R 9V TR 1 C Fig. 1(a) (i) State the function of the diode D in the circuit shown in Fig. 1(a). [1] (ii) Briefly explain the operation of the circuit in Fig. 1(a) when the SPST switch is closed. [2] (iii) Calculate the required value of resistance when used in series with a 2200 F capacitor to produce a time constant of 3 minutes. [2] (iv) Two modifications have been suggested for the circuit shown in Fig. 1(a). An adjustable time delay. An addition which allows the capacitor to rapidly discharge. Explain how these modifications could be implemented. [4] (v) The circuit shown in Fig. 1(a) could be produced using a programmable system. State two advantages of using a programmable system for this type of circuit. [2] ASV3W7 ASV3W7 2222 2 [Turn over (b) A comparator circuit is shown in Fig. 1(b). The components R1, R2 and R3 have been selected from the E12 series. 6V 6V R1 1 k R3 5.6 k + R2 1 k LDR Vo V2 V1 0V 0V 6V 6V Fig. 1(b) (i) Explain what is meant by the term E12 series. [1] (ii) Calculate the voltage V1 on Fig. 1(b). [1] (iii) The resistance of the LDR is 10 k in a low level of light and 1 k in a high level of light. Calculate the voltage range of V2 between low and high levels of light. [4] (iv) State the output Voltage Vo of the comparator when the light level is low and give a reason for your answer. [2] ASV3W7 2222 3 [Turn over BLANK PAGE ASV3W7 2222 4 [Turn over 2 (a) Fig. 2(a) shows a typical lifting mechanism used on stacking systems. (i) Name the component shown at Z. [1] (ii) Briefly explain why a pulley and belt system may not be suitable for this lifting mechanism. [2] Z Load Lifting Base Chain Fig. 2(a) ASV3W7 2222 5 [Turn over (b) Fig. 2(b) shows an incomplete lifting platform which will raise or lower when the cylinder moves out or in. On the pro forma provided which shows the platform in the raised position (answer number 2(b)) name and draw a suitable mechanism to achieve the desired motion. [5] Platform Cylinder Fig. 2(b) (c) Fig. 2(c) opposite shows part of a winch mechanism. The handle turns the gear system which revolves the drum to wind in the cable. (i) State the direction of rotation of pulley F if the handle rotates in a clockwise direction. (ii) Calculate the velocity ratio between gear A and the drum E. [5] (iii) Calculate the effort required at the handle if the efficiency of the overall winch mechanism is 80%. Assume that the overall velocity ratio is 40. ASV3W7 [2] [4] 2222 6 [Turn over ASV3W7 2222 7 [Turn over Load Load 320N 320 N Pulley F Drum E Cable Fig. 2(c) Fig. 2(c) Pulley C Diameter 70 mm Pulley D Diameter 210 mm Gear A 20 Teeth Handle/Effort Gear B 80 Teeth 3 Fig. 3 opposite shows a pneumatic circuit used for opening and closing two air inlets. (a) Name the following activation methods shown on Fig. 3: (i) Activation method at X. [1] (ii) Activation method at Y. [1] (b) During operation the following problems were detected. (i) Cylinder B failed to outstroke or instroke. With close inspection of the five port valve briefly explain why this may happen. [2] (ii) Cylinder A was found to outstroke in a sluggish manner. Briefly explain what may have caused this. [2] (c) On the pro forma provided (answer number 3(c) and (d)) complete the circuit to enable cylinder A to outstroke before cylinder B outstrokes when controlled by the three port valve. [5] (d) On the pro forma provided (answer number 3(c) and (d)) complete the circuit enabling the three port valve to be operated using an air bleed at X instead of the previous method. [5] (e) The double acting cylinder B is supplied with an air pressure of 0.4 N/mm2, has a piston diameter of 50 mm and a piston rod diameter of 8 mm. Calculate the force produced by the cylinder during the instroke. Please assume = 3.14. [3] ASV3W7 2222 8 [Turn over Air Inlet Gate A B 14 2 Y 14 5 1 1 3 4 2 5 3 4 12 12 X Fig. 33(a) Fig. ASV3W7 2222 9 [Turn over THIS IS THE END OF THE QUESTION PAPER ASV3W7 ASV3W7 2222 10 [Turn over [Turn over S 11/05 800 9-007-1 ASV3W7 2222 12 [Turn over ASV1W7 2222.02 Question No. 2(b) Pro forma answer page (answer number 2(b)) Please complete the diagram below ADVANCED SUBSIDIARY (AS) TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 January 2007 ASV31IN1 Candidate Number 71 Centre Number ASV1W7 2222.02 Question No. 3(c) and (d) B 4 2 3 5 1 1 3 5 12 14 Pro forma answer page (answer number 3(c) and (d)) 12 14 4 2 A ADVANCED SUBSIDIARY (AS) TECHNOLOGY AND DESIGN Assessment Unit AS 3 Unit 3 January 2007 X ASV31IN2 Candidate Number 71 Centre Number

Formatting page ...

Additional Info : Gce Technology and Design January 2007 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

gce chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: