AURLTE005

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School

St. John's University *

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Course

2001

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Mechanical Engineering

Date

Nov 24, 2024

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docx

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Knowledge Test QUESTI ON NUMBE R QUESTIONS Students response (to be complet ed by the assessor ) Questio n 1: Describe at least two OHS requirements relating to diagnosing complex faults in light vehicle diesel engines? ☐ S ☐NS Questio n 2: List safety precautions while working with following: ● hot engine components ● rotating engine components ● engine oil and coolants ☐ S ☐NS Questio n 3: List three PPE that you would consider while working on vehicle diesel system. ☐ S ☐NS Questio n 4: What are the environmental requirements that needs to be followed while working with vehicle diesel system? As employees of a company that focuses on auto repairs, we have a responsibility to keep environmental protection in the forefront of our minds at all times. Therefore, we should be cognizant of the significance of collecting, storing, and properly disposing of any fluids that are spilled during the course of a service. ☐ S ☐NS Questio n 5: List a complex fault in light vehicle diesel engines related with the following: Intermittent fault Multi system fault Faults due to other system repair Indirect faults caused by the influence of external system ● ● ☐ S ☐NS Questio n 6: Explaining how diesel engine works? As soon as they are started, diesel engines instantly begin the process of compressing the air that they will be utilising, which results in an instantaneous and significant increase in both pressure and temperature. After that, we mix in a trace amount of fuel with the air that has been heated and compressed. Because of the high temperature, the extremely minute quantity of highly atomized fuel that was put into the system was quickly consumed by evaporation. ☐ S ☐NS

Questio n 7: How diesel engine differ from gasoline engine? The spark plug in a gasoline-powered internal combustion engine controls the ignition and combustion processes. After the piston reaches the top of its stroke and the compression reaches the amount the manufacturer desired, a spark ignites the fuel and air combination, allowing the engine to function. To put it simply, this is what makes the car run. The compression is caused by the combination of fuel and fresh air being compressed. There is no spark plug in a diesel engine. ☐ S ☐NS Questio n 8: What is an air fuel ratio? The air-fuel ratio is the proportion by mass of air to the fuel (whether solid, liquid, or gas) in a combustion reaction. It's possible that this proportion would change depending on the fuel source. An explosion can occur if the combustion is not contained, as in an internal combustion engine or an industrial furnace. These two scenarios are equally plausible. ☐ S ☐NS Questio n 9: What is meant by the term atomization? Atomization, sometimes spelled atomisation, is the process of breaking something up into smaller and smaller pieces. In order to atomize something, you must first break it down into smaller and smaller pieces. In the same way that a molecule can be thought of as a small piece of something else, a speck, a granule, or a grain can all be thought of as very minute particles. ☐ S ☐NS Questio n 10: What is turbo charger and why do we need them in diesel engines? A turbocharger is able to assist in making your engine produce a higher compression ratio. Because of the higher air density, it is possible that more of the injected fuel will be consumed. This alteration will result in an increase in air mass as well as an improvement in the efficiency of the engine. Therefore, there is an increase in the torque output. ☐ S ☐NS Questio n 11: Name some of the special equipment can be required to diagnose complex fault in diesel engine? ☐ S ☐NS Questio n 12: Give an example of a quality procedure specific to diesel system. ☐ S ☐NS Questio n 13: Where and what required information would you source to diagnose a complex fault in diesel engine of a vehicle? ☐ S ☐NS Questio n 14: Explain how you would do compression test on a diesel engine. In order to carry out the necessary compression test, the mechanic will insert a gauge into each of the engine's cylinders. The level of pressure that is being produced will be evaluated while the engine is being revved. ☐ S ☐NS Questio n 15: Discuss the importance of monitoring the exhaust system in a modern day vehicle by the engine management system? ☐ S ☐NS Questio What safety procedures should be followed when running ☐ S

n 16: engines indoors? Under no circumstances should a motor be used indoors unless there is enough ventilation and a clear path for the exhaust to leave the premises. It is vital to regularly launder and replace oily clothing in order to prevent skin irritation and dermatitis. Use safe lifting techniques when moving heavy components. Keep the workplace strictly off-limits to customers, relatives, and anybody else who isn't authorised to be there. ☐NS Questio n 17: Briefly explain the following terms that is involved in using a scan tool in relation with diesel engine system. Conditions that can set a DTC in diesel engine Live data Freeze frame data Wave form data ☐ S ☐NS Questio n 18: Identify and list the function or basic operation of the following diesel system components: Component name Function / Operation ☐ S ☐NS

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Questio n 19: What are some of the limitations of diagnostic testing equipment required to diagnose complex faults in light vehicle diesel engines ☐ S ☐NS Questio n 20: List the requirements to complete the work process and processes for documenting and reporting diagnostic findings and recommendations  Gathering relevant information and establishing a detailed history of symptoms  The examination of a person's physical condition.  Generating a preliminary, possibly unclear diagnostic  Testing (ordering, reviewing, and acting on test results)  Finishing the diagnostic process ☐ S ☐NS Questio n 21: Determine the problems for the following symptoms and how would you test the following problems? Symptoms Proble m Testing methods Vehicle emitting white/blue smoke Engine knocks Engine misses under load Engine overheats Engine oil pressure light coming up on dash Abnormal noise from the engine Engine running rough ☐ S ☐NS Questio n 22: List down the testing procedure for the following in a petrol engine. Problems Testing procedures Abnormal noise Cylinder leak down test Oil pressure in the system Failure analysis ☐ S ☐NS Questio n 23: Name the parts of the diesel engine ☐ S ☐NS