VCE VET Integrated Technologies

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1 VCE VET Integrated Technologies Written examination End of year Examination specifications Overall conditions The examination will be sat at a time and date to be set annually by the Victorian Curriculum and Assessment Authority (VCAA). VCAA examination rules will apply. Details of these rules are published annually in the VCE and VCAL Administrative Handbook. There will be 15 minutes reading time and 1 hour and 30 minutes writing time. The examination will be marked by a panel appointed by the VCAA. The examination will contribute 34 per cent to the study score. Content The VCE VET Integrated Technologies examination will be based on the following compulsory units of competency from Units 3 and 4. UEENEEE079A Identify and select components, accessories and materials for electrotechnology work activities Release 1 20 hours UEENEEE044B Apply technologies and concepts to electrotechnology work activities Release hours The weighting of marks on the examination will approximately reflect the proportion of nominal delivery hours of each unit of competency that is examinable for this program. The electives will not be examined. The examination will focus on the essential knowledge and an understanding of the essential skills, as outlined in the elements and performance criteria of the relevant units of competency. The extent of the essential knowledge and associated skills (EKAS) required is given in volume 2 Part 2.2 EKAS of the UEE Training Package. Format The examination will be in the form of a question and answer book. The examination will consist of two sections. Section A will consist of 20 multiple-choice questions worth 1 mark each and will be worth a total of 20 marks. Section B will consist of short-answer questions worth a total of 80 marks. All questions will be compulsory. The total marks for the examination will be 100. Answers to Section A are to be recorded on the answer sheet provided for multiple-choice questions. Answers to Section B are to be recorded in the spaces provided in the question and answer book. Approved materials and equipment One scientific calculator is allowed in the examination room during this examination. VICTORIAN CURRICULUM AND ASSESSMENT AUTHORITY 2012 Version 2 February 2014

2 Relevant references The following publications should be referred to in relation to the VCE VET Integrated Technologies examination. VCE VET Integrated Technologies Program Booklet (published February 2011) and replacement pages 79 in Program Summary: Revised Program Structure for VCE VET Integrated Technologies (published December 2013) VCE VET Assessment Guide (published February 2010) VCAA Bulletin VCE, VCAL and VET Previous Examination Reports on the written examination may also contain helpful advice. Advice The following sample questions provide an indication of the types of questions that teachers and students can expect. Answers to multiple-choice questions are provided on page 15. Answers to other questions are not provided. VCE VET Integrated Technologies (Specifications and sample) Version 2 February

3 Sample questions SECTION A Multiple-choice questions Question 1 Photovoltaic cells A. generate AC power. B. can produce power at night. C. are constructed using layers of N-type and P-type silicon. D. rely on the radiant heat from the sun to produce electricity. Question 2 A 180 R 180 R 100 R B 120 R Figure 1 What is the total resistance between points A and B of the circuit in Figure 1? A. 220 ohms B. 310 ohms C. 580 ohms D. 800 ohms VCE VET Integrated Technologies (Specifications and sample) Version 2 February

4 Question 3 i. ii. iii. Figure 2 The capacitor parts represented in Figure 2 are i. ii. iii. A. lead dielectric plate B. lead plate dielectric C. dielectric plate lead D. plate lead dielectric Question 4 An advertisement for a laptop computer states that it features an Intel Dual Core I3 2.4 GHz processor. The I3 processor is known as dual core because A. two CPU cores provide redundancy should one core fail. B. it has two cache memories in the central processing unit (CPU). C. it contains one CPU and one integrated graphics processor (IGP). D. it contains two CPU cores to prevent processor slow down when accessing computer main memory and input/output (I/O). VCE VET Integrated Technologies (Specifications and sample) Version 2 February

5 Question 5 I F 1 2A R 1 22 Ω V s = 25 V R 2 3 Ω A Figure 3 If R 1 in Figure 3 became short circuit A. the current value shown on the ammeter would not change. B. the voltage across R 1 would increase. C. fuse F 1 would blow. D. R 2 would overheat. VCE VET Integrated Technologies (Specifications and sample) Version 2 February

6 Question 6 AC 12 VAC 4 50 W lamps Figure 4 Four 50 W quartz-halogen lamps are connected to a 12 VAC supply via a 100 m double-insulated 1 pair copper cable. The cross-sectional area of the wire conductor is 1 mm 2 and the resistivity (ρ) of the copper is Ωm. With a cable resistance of 3.44 Ω and a current of 2.88 A flowing, the lamps are not lit. To have the lamps operate at near maximum brightness, the circuit must be charged by A. replacing the existing cable with a 2 mm 2 cross-sectional area cable. B. connecting another cable of the same size in parallel with the existing cable. C. replacing the quartz-halogen lamps with standard incandescent lamps of the same wattage. D. providing a 240 VAC supply to the cable and stepping the voltage down to 12 VAC at the lamps using a transformer. Question 7 An insulation tester is being used to check the integrity of a 240 VAC extension cable. The cable will be deemed faulty if A. at the plug end, the resistance between the active (brown) wire and the earth (yellow/green) wire is 5 MΩ. B. at the plug end, the resistance between the neutral (blue) wire and the earth (yellow/green) wire is 5 MΩ. C. the earth wire continuity from plug to socket is 1 KΩ. D. the active to neutral test is 10 MΩ. VCE VET Integrated Technologies (Specifications and sample) Version 2 February

7 SECTION B Question 1 A new caravan is fitted with a Combo RCD-MCB device to protect the 240 VAC electrical circuit. This is a residual current device (RCD) and mini circuit breaker (MCB) combined into one switch. The RCD will trip the device when a current imbalance of greater than 30 ma is detected between the active and neutral wires. The MCB will trip the device when the total circuit current exceeds 15 A. The caravan s appliances and their power ratings are shown in the table below. Appliance fan heater Power rating (watts) 2400 on high setting and 1200 on low setting electric kettle 1200 toaster 1000 microwave oven 800 LCD TV 200 reading lamp 12 clock radio 5 The caravan occupant is cooking dinner and has switched on the following appliances: microwave oven, electric kettle, toaster and LCD TV. The occupant then switches the fan heater on to the high setting and the Combo RCD-MCB trips. a. What is the most likely cause of this problem? b. What action should the occupant take to rectify this problem and restore the power? 1 mark 2 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

8 The occupant now has the following appliances operating: fan heater on the low setting, LCD TV, reading lamp and clock radio. The occupant decides to make a cup of coffee, switches on the electric kettle and the Combo RCD-MCB trips. c. Calculate the total current flowing in the circuit. d. State two possible causes of this problem. 3 marks e. What course of action would rectify this problem? 2 marks 2 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

9 Question 2 Figure 1 shows the printed circuit board design of a Servo Motor Controller. The parts list for the controller is shown in Table 1. 0 V C 2 9 V REG1 REG servo controller C 1 Servo IC1 1 B1 C 2 RV1 R IC1 8 Servo C 1 pulse R 1 RV1 Figure 1 Figure 2 Table 1 R 1 C 1 C 2 Part number RV1 REG1 IC1 SERVO B1 Description 10 k ohm 0.25W resistor 100 nf polyester capacitor 470 nf polyester capacitor 10 k linear potentiometer 7805 regulator PICAXE 08M microcontroller mini servo motor 9 V battery a. What is the main difference between a Servo motor and a standard DC motor? b. What is the main function of the component REG1 and what voltage is being fed from it to the microcontroller (IC1)? 1 mark 2 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

10 c. What is the resistance of RV1 when turned to the halfway position? 1 mark d. With RV1 in the halfway position, what voltage would you measure at pin 3 on IC1? 1 mark e. Using the PCB design in Figure 1 as a guide, complete the circuit diagram in Figure 2. 3 marks Question 3 As part of the construction of an electrotechnology project, you are required to prepare components (bending and cutting), clean the printed circuit board (PCB), then solder components to the PCB using a soldering system. Prior to commencing your soldering task, you are required to carry out a Job Safety Analysis (JSA) by recording the activities, hazards and control measures on the following extract of a JSA worksheet. List four activities in the order you will perform them. For each activity, detail hazards which might cause injury. Detail the risk-control measures required for each hazard and who is responsible for implementing the risk-control measure (for example, self or supervisor). Activity Hazards Risk-control measures Responsibility 12 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

11 Question 4 Figure 3 shows a grid connected photovoltaic (PV) solar system installed on the roof of a home. The system uses six 36 VDC photovoltaic arrays feeding into an inverter, producing 230 VAC which connects back into the main power grid. The inverter is 90% efficient. The input DC window is volts (DC). 30 V 28 V 29 V inverter grid 24 V 26 V 27 V Figure 3 a. At a certain time during the day, the arrays are producing DC voltages as shown in Figure 3. i. What is the total voltage being delivered to the inverter? ii. Does this voltage meet the requirements of the inverter? Provide an explanation for your answer. 2 1 = 3 marks b. What is the input power to the inverter if 7 A of current is flowing from the arrays? 2 marks c. If the inverter is 90% efficient, what output power is being delivered to the mains power grid? 2 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

12 d. The solar arrays are generating different voltages. What might need to be done to improve the output voltages of some arrays? 1 mark VCE VET Integrated Technologies (Specifications and sample) Version 2 February

13 Question 5 A light-dependent resistor (LDR) mounted on the dashboard of a car is used to automatically turn the headlights on when the light level is reduced. The car s on-board computer monitors the voltage from the LDR. Figure 4 shows the LDR circuit. A graph of the LDR s characteristics (resistance versus light level in lux) is shown in Figure 5. 5Volts R1 10kΩ ADC I/P Car On-board Controller LDR LDR Figure LDR resistance versus light level 199 resistance in kω light level in LUX Figure 5 VCE VET Integrated Technologies (Specifications and sample) Version 2 February

14 a. In the table below, record the resistance of the LDR and the voltage at the analogue input (ADC I/P) of the on-board computer for the given light levels. Light level in lux LDR resistance ADC I/P voltage b. In the space below, plot the graph of the LDR resistance versus the ADC I/P voltage. 6 marks ADC I/P Voltage resistance kω 4 marks VCE VET Integrated Technologies (Specifications and sample) Version 2 February

15 Answers to multiple-choice questions Question Answer 1 C 2 B 3 A 4 D 5 C 6 D 7 C VCE VET Integrated Technologies (Specifications and sample) Version 2 February

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