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© The City and Guilds of London Institute 2017

ST00050679 A3 PO4500127515 10309353

Friday 23 June 201713:30 – 15:00

You should have the following for this examination• a pen with blue or black ink• a non-programmable calculator

General instructions• Use black or blue ball-point pen.• The marks for questions are shown in brackets.• This examination contains 12 questions. Answer all questions.• Answer the questions in the spaces provided. Answers written in marginsor on blank pages will not be marked.• Cross through any work you do not want to be marked.

0171-516 JUNE 2017Level 3 Advanced Technical Extended Diploma in Land-BasedEngineering (1080)Level 3 Land-based Engineering – Theory exam (1)

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0171-516 23 June 2017

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1 a) Identify the components labelled A, B and C in Figure 1. (3 marks)

http://www.billavista.com

Figure 1

b) Explain how the hydrostatic steering system works if the hydraulic pump fails to deliver flow. (3 marks)

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2 Explain the function and working principle of ABS (anti-lock braking system). (6 marks)

3 a) Name the two fluids that make up the electrolyte in the lead acid battery. (2 marks)

b) State the hydrometer reading expected when testing a fully charged lead acid battery. (1 mark)

4 Explain how to conduct a high rate discharge test on a battery. (4 marks)

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5 a) Refer to Figure 2. Which relay should be engaged in order to operate the high beams? (1 mark)

http://www.rowand.net

Figure 2

b) If only the high and low beam lights fail in Figure 2, what are the two most likely causes for the failure? (2 marks)

6 The rectifier pack in an alternator has failed.Explain how to test this fault using a multi-meter. (2 marks)

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7 a) What does CAN stand for? (1 mark)

b) What voltage is expected on the CAN-hi in a CAN system? (1 mark)

c) What type of signal is transmitted along a CAN system? (1 mark)

d) What does a resistance of 120 ohms on a CAN system indicate? (2 marks)

8 Explain the operation of a hot wire mass air flow sensor (MAF). (3 marks)

9 The fuel gauge on a tractor is reading full, even though the tank is empty.Explain twoways to diagnose the fault. (4 marks)

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10 a) Identify the type of pump shown in Figure 3. (1 mark)

http://www.directindustry.com

Figure 3

b) Name the components labelled A and B in Figure 3. (2 marks)

c) Assuming that there is a constant mechanical drive to the pump, explain how the throughput of hydraulic oil is varied. (3 marks)

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d) Explain the function and working principle of the load sensing systems with reference to the pump’s operation. (3 marks)

11 Describe how a hydrostatic transmission creates drive. (3 marks)

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12 A suspected fault with the hydraulic multi-plate clutch pack has been reported on a tractor with full powershift transmission. On inspection, you see a fault code on the instrument cluster.

Discuss the preparation stages, resources and steps required to carry out a full diagnostic assessment. (12 marks)

End of examination

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