1. a) Identify the formula that would be used to calculate the volume of an engine cylinder. (1 mark)

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Qualification title: Level 3 Advanced Technical Extended Diploma in Land-Based Engineering Test title: 0171-515/015 Level 3 Land-based Engineering theory exam Version: April 2017 Exam date:

1 Qualification title: Level 3 Advanced Technical Extended Diploma in Land-Based Engineering Test title: /015 Level 3 Land-based Engineering theory exam Version: April 2017 Exam date: 26/04/2017 Exam time: 13:30-15:00 Base mark: a) Identify the formula that would be used to calculate the volume of an engine cylinder. Figure 1 b) Using the formula identified in a), calculate - in cubic centimetres - the capacity of the engine cylinder shown in Figure 1. Show all workings in your answer. (2 marks) : a) 1 mark for correct formula: πr 2 x L b) 1 mark for correct calculation, 1 mark for correct answer (in cm 3 /cc) π2.5 2 x 10 = cm 3 Test spec reference: Unit 350, 1.4, Total marks: 3 AO1/AO2

2. a) State the purpose of a hydrometer in relation to a lead acid battery. b) Explain how relative density relates to the state of charge of the battery.

2 2. a) State the purpose of a hydrometer in relation to a lead acid battery. b) Explain how relative density relates to the state of charge of the battery. a) 1 mark for each of the following up to 1 mark: To measure specific gravity. (4 marks) b) 1 mark for each, for any 4 of the following, up to 4 marks: A level of 1.28 would indicate fully charged A lower reading would indicate the cell is partially or fully discharged As the cell discharges, specific gravity drops As the battery discharges, there is more distilled water and less sulphuric acid A reading of 1.12 would indicate a fully discharged cell Test spec reference: 350, 1.1, AO1/AO2 Total marks: 5 3. a) State the equation used in Pascal s Law. b) Figure 2 Using Figure 2, calculate the force output from Cylinder B. Show all workings in your answer. (5 marks) a) 1 mark for correct equation (P = F/A) b) 1 mark for each of the following, up to 5 marks: Piston area calculated correctly Pressure in the circuit calculated correctly Used Pascal s Law to calculate the output force of Cylinder B Cylinder area calculated correctly Correct units of measure used throughout Test spec reference: 350, 1.1, 1.4 AO1/AO2 Total marks: 6

3 4. Figure 3 Using the graph shown in Figure 3, describe the points marked A, B and C and state their values. Point Description Value A B C (6 marks) 1 mark for each of the following, up to 6 marks: Point Description Value A Maximum torque 440 Nm (+/- 5 Nm) B Maximum power 74 kw (+/- 1 kw) C Power at rated speed of 2000 rpm 73 kw (+/- 1 kw) Test spec reference: 350, 1.1, 1.5 AO1/AO2 Total marks: 6 marks

5. Figure 4 http://3.bp.blogspot.com Figure 4 shows a simple compound gear assembly. The input shaft is driven clockwise, and the input speed of Gear A is 540 rpm.

4 5. Figure 4 Figure 4 shows a simple compound gear assembly. The input shaft is driven clockwise, and the input speed of Gear A is 540 rpm. Gear A has 24 teeth, Gear B has 18 teeth, Gear C has 16 teeth and Gear D has 26 teeth. a) State the direction of travel for the output gear. b) Calculate the output speed of Gear C, showing all workings. c) Determine the overall ratio of the gearbox. (2 marks) a) 1 mark for stating clockwise. b) 1 mark for each of the following, up to 2 marks: 1170 rpm Correct working (speed of driver x number of teeth on driver / teeth of driven) c) 1 mark for correct ratio (2:1, but will accept 2.166:1) Test spec reference: 350, 1.4, AO2 Total marks: 4

6. A four cylinder in-line engine has a firing order of 1, 3, 4, 2. a) When number 2 cylinder is on an induction stroke, determine the stroke of number 3 cylinder.

5 6. A four cylinder in-line engine has a firing order of 1, 3, 4, 2. a) When number 2 cylinder is on an induction stroke, determine the stroke of number 3 cylinder. b) Number 1 cylinder is found to have low compression. State four likely causes of this. (4 marks) a) 1 mark for power stroke. b) 1 mark for each, for any 4 of the following, up to 4 marks: Worn piston rings Worn cylinder liners Worn valves/seats Incorrect valve clearances Damaged/worn head gasket Test spec reference: 352, 1.1, AO2 Total marks: 5 7. Figure 5 a) Identify components A, B and C. b) State the four main functions of component D shown in Figure 5. a) 1 mark for each of the following, up to 3 marks: A Common rail B Electronic injector C High pressure pump (3 marks) (4 marks) b) 1 mark for each of the following, up to 4 marks: Matches fuelling to emissions control system feedback

6 Ensures maximum fuel efficiency under different loads Monitors sensor inputs, and creates outputs Generates fault codes Test spec reference: 352, 1.4, 1.5, AO1, AO2 Total marks: 7 8. State three advantages and three disadvantages of a liquid cooled engine compared to an air cooled engine. (6 marks) 1 mark for each of the following, up to 3 marks: Advantages: o Greater control over engine temperature o Faster engine heat-up o More efficient transfer of heat o Less noise 1 mark for each of the following, up to 3 marks: Disadvantages: o More expensive to manufacture o Increased maintenance requirements o More complex system o Coolant leakage problems (internal and external) Test spec reference: 353, 1.3, AO2 Total marks: 6 9. List three possible faults of the lubrication system that may result in low engine oil pressure. (3 marks) 1 mark for each, for any 3 of the following, up to 3 marks: Incorrect specification of oil (too thin) Worn oil pump Partially blocked strainer Relief valve stuck open Low oil level Test spec reference: 353, 1.2, AO2 Total marks: 3

7 10. Figure 6 Identify the components of the engine lubrication system labelled A, B and C in Figure 6. (3 marks) 1 mark for each of the following up to 3 marks: A Pressure relief valve B Oil pump C Oil strainer Test spec reference: 353, 1.2, AO1 Total marks: 3

8 11. You are currently working as an engineer in a land-based workshop facility. A tractor with a common rail diesel engine has been brought in as the customer has complained that it is down on power. Discuss how you would determine the serviceability of the fuel system components. (12 marks) Indicative content Dynamometer test and compare results to manufacturer s specifications Monitor fuel system parameters with appropriate diagnostic tool Check condition of fuel Replace filters Clean water sedimentors Conduct low pressure test Injector leak off test Injector cut out test Clean fuel strainer Band 1 (1-4 marks) The candidate has failed to identify many of the appropriate diagnostic checks. The candidate has provided minimal rationale for the checks they have proposed. The candidate s response may have frequently strayed from focusing on the fuel system components of a common rail diesel engine. The candidate will not have suggested any expected outcomes of their proposed checks for a serviceable fuel system. Band 2 (5-8) marks) The candidate has proposed some of the diagnostic checks, but these may not be presented in a logical sequence. The candidate may have provided some reason for proposing certain checks. The candidate has largely focused on the fuel system components of a common rail diesel engine, but may have strayed into discussing other areas of the engine. The candidate is unlikely to have suggested expected outcomes of their proposed checks for a serviceable fuel system. Band 3 (9-12 marks) The candidate has proposed most (if not all) of the diagnostic checks, and in a logical sequence. The candidate has provided clear reasons why they have proposed each check. The candidate has remained focused on the fuel system components of a common rail diesel engine. The candidate has (where applicable) suggested expected outcomes of their proposed checks for a serviceable fuel system. Test spec reference: Units 350, 352, AO4 Total marks: 12

Qualification: /515 Level 3 Land-based Engineering - Theory exam June 2018

Qualification: /515 Level 3 Land-based Engineering - Theory exam June 2018 Qualification: 0171-38-015/515 Level 3 Land-based Engineering - Theory exam June 2018 1 1a. Define Hooke s law. (1 mark) 1b. State the formula for Hooke s law. (1 mark) 1c. Using the graph in Figure 1,