NATIONAL CERTIFICATE (VOCATIONAL) AUTOMOTIVE REPAIR AND MAINTENANCE NQF LEVEL 2 NOVEMBER 2009

Transcription

1 NATIONAL CERTIFICATE (VOCATIONAL) AUTOMOTIVE REPAIR AND MAINTENANCE NQF LEVEL 2 NOVEMBER 2009 ( ) 12 November (X-Paper) 09:00 12:00 This question paper consists of 9 pages.

2 ( ) -2- NC240(E)(N12)V TIME: 3 HOURS MARKS: 120 INSTRUCTIONS AND INFORMATION Answer ALL the questions. Read ALL the questions carefully. Number the answers according to the numbering system used in this question paper. Write neatly and legibly.

3 ( ) -3- NC240(E)(N12)V QUESTION 1: ENGINE TECHNOLOGY 1.1 Choose a function from COLUMN B that matches an engine component in COLUMN A. Write only the letter (A D) next to the question number ( ) in the ANSWER BOOK. COLUMN A COLUMN B Piston rings Crankshaft Connecting rod A B to allow gases out of the combustion chamber to transfer forces from the piston to the crankshaft Exhaust valve C to seal compression pressure in the combustion chamber of the engine D to convert reciprocating motion into rotary motion (4) 1.2 The drawing below shows labelled engine components. Consider all information and direction arrows given, then answer QUESTIONS to flywheel ring gear operating shaft pull from solenoid motor armature pinion engages with flywheel What is the ultimate result if the ignition is switched to the start position? (1) What electronic part initiates this rotation action? (1) Name the TWO parts that turn in opposite directions. (2) Name the part in the starter motor that makes the pinion gear moves towards the flywheel, reacting due to a magnetic field. (1)

4 ( ) -4- NC240(E)(N12)V 1.3 Name TWO components that form part of the cooling system of a vehicle. (2) 1.4 Name THREE components that form part of the petrol system of a vehicle. (3) [14] QUESTION 2: BALANCE A WHEEL 2.1 Name THREE different types of wheel balancing equipment or machines used in automotive workshops. (3) 2.2 Which tools would you need to undertake the following tasks when balancing wheels: To remove wheels (1) To remove wheel weights (1) 2.3 Which THREE important pieces of information/data specifications must be loaded onto a modern wheel balancing machine before a wheel can be tested and balanced on the machine? (3) [8] QUESTION 3: VEHICLE LIFTING EQUIPMENT 3.1 Indicate which tasks would normally be done by a technician on a vehicle while using the following equipment: Engine hoist (1) Trolley jack (1) Four post hoist (1) 3.2 Give the reason why a vehicle must be equipped with a small portable lifting tool. (2) 3.3 Name ONE type of portable vehicle jack commonly stored in the boot of a vehicle. (1) [6]

5 ( ) -5- NC240(E)(N12)V QUESTION 4: CARRY OUT A SERVICE 4.1 The drawing below indicates an engine part. Identify the part and the system on which it is used or works on. HT lead from coil insulating plastic cap conducting carbon rod HT lead to spark plug electrode rotor arm electode (2) 4.2 Analyse the above drawing and answer the following questions What engine part drives it? (1) Give the reason why it could only have four cams separated at 90 degrees apart. (1) How does it change the spark timing? (1) Why does it have a rotor that can turn 360 degrees? (1) How is the high voltage from the coil conducted to each spark plug? (1) 4.3 During a vehicle service, certain quality checks must be carried out. Explain the procedure to ensure that the ignition system is correctly set, using a timing light. (10)

6 ( ) -6- NC240(E)(N12)V 4.4 Indicate ONE item that should be inspected and give a reason why it may be replaced during a minor service for each of the following vehicle systems: The carburettor system (1) The brake system (1) The suspension system (1) [20] QUESTION 5: REMOVE, TEST, FIT AND SERVICE AN AUTOMOBILE BATTERY 5.1 An automotive battery can be tested with different types of equipment. Name FOUR types of battery test equipment that may be used to conduct tests. (4) 5.2 State why a battery is needed in a vehicle (1) 5.3 What is meant by 'jumping' a motor vehicle battery? Briefly describe. (3) [8] QUESTION 6: INSPECT AND LUBRICATE AN AUTOMOTIVE SYSTEM 6.1 Describe the importance and purpose of using engine oil in the engine. (3) 6.2 If a motor vehicle is serviced regularly according to the manufacturer's specifications, how does this impact on the operational condition of a vehicle? (3) 6.3 Describe how you would go about inspecting a vehicle for fluid leaks and include some common areas where leaks occur. (3) 6.4 Should any parts of the vehicle leak after a service has been completed? Answer only Yes or No. (1) [10]

7 ( ) -7- NC240(E)(N12)V QUESTION 7: ADJUST HEADLIGHTS 7.1 Match the function in COLUMN B with the parts in COLUMN A. Write only the letter (A C) next to the question number ( ) in the ANSWER BOOK. COLUMN A COLUMN B Lens Filament Reflector A B the part of a bulb that glows to give light the part of a light fixture that covers the lamp and re-directs some of the light from the lamp C a curved piece of glass for concentrating or spreading rays of light passing through (3) 7.2 Make a simple freehand sketch of the special workshop equipment that is used for headlight adjustment and testing. (3) [6]

8 ( ) -8- NC240(E)(N12)V QUESTION 8: DISMANTLE AUTOMOTIVE COMPONENTS 8.1 Analyse the columns carefully and give the corrective action to be taken in COLUMN X for the dismantled defective parts in COLUMN Y. Write only the letter (A D) next to the question number ( ) in the ANSWER BOOK. COLUMN Y DISMANTLED AND DEFECTIVE VEHICLE COMPONENT COLUMN X VARIOUS CORRECTIVE ACTIONS TO BE TAKEN, CHOOSE ONLY ONE FROM A TO D COLUMN Y A B C D Oil is drained from the engine and replaced with new oil Brake shoes on rear wheels are badly worn and not effective Cracked tappet cover gasket that causes engine oil to leak Damaged contact-breaker, points reduce engine performance Front brake pads noisy and worn, metal to metal Faulty ignition timing minimises engine performance RESET REPLACE REPLACE AND RESET FIT NEW FILTER 8.2 Name any items that must be re-used when dismantling and reassembling components. (2) [14] (12) QUESTION 9: REMOVE AND FIT MECHANICAL AND ELECTRICAL AUTOMOBILE COMPONENTS 9.1 Draw the electrical calculation symbols used for voltage, current and resistance. (3) 9.2 Explain the steps to check and test that a set of spark plugs is working correctly in the engine. (6)

9 ( ) -9- NC240(E)(N12)V 9.3 Complete the following sentences by using the words provided in the list below. Write only the word(s) next to the question number ( ) in the ANSWER BOOK ignition; radiator cap; alternator; spark plugs; distributor After the engine has cooled down, you need to check the water level. You must first remove the. (1) A faulty will send a charge at a lower voltage than 12 volts. (1) The coil forms part of the system in a motor vehicle. (1) A contact breaker is part of the assembly. (1) When starting a vehicle the coil activates a high voltage pulse to the. (1) [14] QUESTION 10: WORKSHOP SAFETY 10.1 Define an accident. (3) 10.2 Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to the question number ( ) in the ANSWER BOOK Check and clean the tyre grooves from foreign material before spinning it on the wheel balance machine. (1) The tyre must not be covered with the wheel guard before spinning it. (1) Using trestles after lifting a vehicle with a jack is good safety practice. (1) To drive a vehicle with a faulty handbrake system is safe. (1) Check that all wheels are equally inflated before taking a long trip with a vehicle. (1) 10.3 What law prescribes safety and security of the work force in industry and the enforcement of employees to adhere to the safety code of conduct? (2) 10.4 Personal protection equipment (PPE) is instituted by the Safety Act. Name FIVE types and give a reason why you would use it to protect yourself in the motor workshop. (10) [20] TOTAL: 120