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Automobile Engineering Materials Free Download





What is SAE? Mention the importance of SAE to the automobile domain.

SAE stands for society of automotive engineers. This society is responsible for developing the standards for the engineering of powered vehicles of all kind. The vehicles may include car, boat, truck and even aircraft. SAE has developed standards for ground vehicles and aerospace vehicles. SAE also encourages students of engineering, technology, science and math’s disciplines. This society has been publishing technical information since 1906.

What is DTSI? Why this technology is used in motor bikes?

DTSI stands for Digital Twin Spark Ignition. This is used to get better combustion in the combustion chamber. In this technique double spark plugs are used to obtain better combustion of fuel in cylinder head. Through this technique fuel is ignited properly. Moreover it provides better efficiency and it is economical in fuel consumption.

How does the thermostat work?

When the engine is too cold the thermostat closes the main valve, thus stopping the flow to the radiator. When the engine is too hot, it opens the main valve for normal circulation through the radiator.

What is a pressure cap in the radiator?

It is a seal in the radiator that maintains the selected pressure in the cooling system when the engine is hot.

Why does a compression engine use high –octane fuel?

The property of a fuel, which describes how fuel will or will not self-ignite, is called the octane number or just octane. Engines with low compression ratios can use fuels with lower octane number, but high compression engines must use high-octane fuels to avoid self-ignition and knock.

What is the use of hydrogen in automobile?

Low emissions. Essentially no CO or HC in the exhaust as there is no carbon in the fuel. Most exhaust would be H2O and N2 Fuel availability. There are a number of different ways of making hydrogen, including electrolysis of water.

What is the use of Natural gas in automobiles?

High octane number makes it very good S.I engine fuel

Low engine emissions. Less aldehydes than with methanol

What is pitching in the suspension system?

Pitching is a rocking action about a transverse axis through the vehicle, parallel to the ground. The front suspension moves out of phase with the rear, experiencing the rocking effect due to pitching.

What do you mean by Independent suspension?

Independent suspension refers to the mounting of the wheel on a separate axle, so that road shocks affect only the particular wheel.

What is pan hard rod or track bar?

A pan hard rod is a bar or tube running from one side of the axle to the frame on the other side of the vehicle. It helps the leaf spring in keeping the axle centered under the body during turning a corner.

What is clutch drag?

When the clutch is not disengaging fully and provides some difficulty in changing the gears then this defect is called clutch drag.

1. What is the significance of BS 3 or 4 engines?

2. Explain the consequences of using BS3 engine fuel with BS4 engines.

3. What will happen if wrong fuel is burnt in engine?

4. Why oil is mixed with coolant and what are causes of this?

5. What is an injector pressure in heavy vehicle?

6. What is engine efficiency?

7. What is the engine efficiency range in two stroke engine?

8. Why two stroke engine can’t be used in cars?

9. What is the function of commutator in starting system?

10. Explain the crankshafts used in two piston system.

11. What is a stage time?

12. How power can be generated in engine?

13. Why front wheel is bigger than rear wheel in tractor?

14. How efficiency can be calculated in 500 k.v.a diesel generator?

15. Due to drive torque,What is transverse weight shift?

16. Why black colour are used for tyres?Is there anything related with heat conduction?

17. Explain the working principle of hydrostatic propeltion system in a tractor?

18. Can servomotor be used for applying torque or load to the gear box drive shaft at various speeds for gear box testing purpose.

19. Why rear wheels are bigger in vehicles?

20. What is king pin offset?

21. How BHP can be calculated in SI units?

22. Differentiate between two stroke engines four stroke engines.

23. What size of a compressor (CFM) is recommended for the purpose of inflating car tyres, spray painting, etc.?

24. Do the design & fittings depend on the type of the vehicle engine? Why is petrol used for engines only & vice versa.

25. Will engine performance be damaged by mixing oil in fuel of four stroke bike ?

26. How to calculate the Speedometer ratio in the vehicle?

27. What is BHP?

28. How BHP is measured?

29. What is the difference between BS2 & BS3 engine?

30. Explain the concept of CC of engines?

31. What is back compressor in engine?

32. Explain Terminal Engine Meltdown?

33. What is meant by1.8 TSI 4V 1798cc turbocharged?

34. What is CPK value?

35. Why wheel type steerig is used in cars instead of hand steering used in auto-rickshaw?

36. Where is fan located in car?

37. Why oil with petrol can be used in two stroke engines but not in four stroke engines (two wheelers)?

38. What stands for AC in AC mechanical fuel pump?

39. Which engines have the high mechanical efficiency either 2 stroke engines or 4 stroke engines?

40. What happens if you use petrol in diesel engine?

41. How the engine does start working when we start our two wheeler?

42. Why are I/P transducer connected with 24V DC not to 220V AC?

43. What is the engine rating required for 1000 KVA generator set?

44. How much diesel does 1000 KVA rating DG set at full load consume?

45. How can you test the Speedo meter?

46. What is the allowable -ve crankcase pressure (vacuum) in the gas engine of 1.5 MW,

47. What is the fundamental equation for correct steering?

48. Is filter Generated (Diesel filter & Air Filter) from Diesel Generators are Hazardous waste?

49. What is meaning of 1640 write on the trailor?

50. What is the composition of Cast Iron Grade: GG P70?

51. What are the troubles in inaccurate gauge reading?

52. How air condition work in the car?

53. What is the three method of heat transfer?

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