SUGGESTION OF

AUTOMOBILE ENGINEERING (ME803D)

1. What is the function of a clutch ? Discuss various factors affecting the torque transmission in a

clutch. Explain the working of a centrifugal clutch with a suitable sketch. Deduce the equation of friction

torque for single plate clutch using uniform wear theory. What are the requirements of a good clutch

materials ? Explain the construction and operation of disc clutch used in automobile.

2. Explain clearly the requirements of automobile brakes. Explain the working of a vacuum bake by

means of a diagram. Explain the working principles of Hydraulic braking system with simple sketches.

3. What is the function of the propeller shaft? Why slip joint is used in propeller shaft? Describe Hookes

joint with a neat sketch. Write short notes on sliding mesh gear box.

4. What is piston clearance ? Why is it necessary ? What is piston slap? Why does it occur and how is it

eliminated ? Why are two compression rings used in piston?

5. Describe the merits and demerits of two-stroke engines compared to four-stroke engines.

6. Obtain the expression for minimum stopping distance for a vehicle when brakes are applied to the

front wheels only or when brakes are applied on rear wheel only or when brakes are applied on all four

wheels. What do you know about braking efficiency ?

7. A car weighs 13000 N has a wheel base of 25 metres. The centre of gravity of the car is 12 m in from

the front of rear axle and 800 mm above the ground level. The car having brakes on all four wheels.

The coefficient of adhesion between the road and the wheels is 05. If the car is moving an inclined

angle whose sine is equal to 01. Calculate i) load distribution between front and rear axles ii)distance

at which it can be stopped while going at a speed of 50 km/hr when only rear wheel brakes are applied.

8. State the requirements of differential in automobile vehicle. Discuss the functions of a differential

gear box. Draw a constructional diagram of a differential. Explain the gear movement when the vehicle is

taking turn or explain the function of differential with neat sketch.

9. What are the various resistances to motion of a vehicle ? How do they affect power for propulsion ?

Define tractive effort and traction. Establish a relation between engine power and tractive effort.

10. Calculate the power required in an engine fitted on a truck whose weight is 25 kN, frontal cross-

sectional area is 325 m2 and which can run on level road at a highest speed of 80 km/hr. The

mechanical efficiency of the vehicle is 80% and transmission efficiency of the vehicle is 90%. Take

coefficient of rolling resistance K r = 002 and aerodynamic coefficient K a = 0035 N-hr2 /m

2 -km

2

11. What are the different types of combustion chambers in CI engine ? Describe open combustion

chamber with sketch. Describe the electronic ignition system with a sketch.

12. What is the importance of lubrication in automobile engine ? What are the advantages and

disadvantages of air cooling ? What is the advantage of water cooling over air cooling? What do you

mean by overcooling and under cooling? Write a short note on thermostat. Describe briefly the different

lubricating systems used in automobiles. What do you understand by "crankcase ventilation" ? What is

the difference between hydrodynamic and hydrostatic lubrications ? What are the purposes of crank case

and oil pan in engine cylinder ? What are the disadvantages and advantages of undercooling ? What are the desirable properties of a good lubricating system?

13. Sketch and explain the working of torque converter. "Torque converter is a gear box." Justify the

statement.

14. Explain semi-floating type rear axle with neat sketch. In which type of the vehicle is this type of

axle used ?

15. What do you mean by fuel injection system of a diesel engine ? What are the main objects of fuel

pump and fuel injector for diesel engine ? Why in modern engines petrol injection is preferable than

carburetor system ? Describe the construction and operation of diesel fuel filter. What are the main

objects of fuel pump and fuel injector for diesel engine?

16. Explain the working principle of simple carburetor referring a diagram. What do you mean by

constant choke and constant vacuum carburetors ? Differentiate between SU and Solex carburetor.

17. Find the mean lining pressure and heat generation during braking a vehicle.

18. Describe constructional details of piston. What materials are used to manufacture piston ? Briefly

explain the construction of connecting rod.

19. What are cylinder liners ? Why is this used in cylinders ? What are the different types of

cylinder liners ? Describe any one of the liners.

20. What is the difference between a D.C. generator and an alternator ? Explain the construction and

working of an alternator.

21. Why is the starter motor used in automobile engine ? State the function of cut-out relay. Explain

the construction and working of cut-out relay.

22. What are the different types of steering mechanisms that are used in automobiles ? Describe with

sketch, which is commonly used in automobiles. What is the drawback of other mechanism which

restricts its use in automobiles ? What is Ackermann mechanism ? Explain it in detail.

23. What do you mean by steering gear ratio ? Why steering gear box with reduction gear are used in

steering system ? What is power steering? Explain the working of power steering mechanism with neat

sketch.

24. What do you mean by automatic transmission ? What are its advantages?

25. Explain the working principle of a simple carburetor with the help of a neat sketch. Explain why rich

mixtures are required for idling and maximum power.

26. Describe a diesel fuel injector with a diagram showing its different parts.

27. A multi-disc clutch has 3 discs on the driving shaft and2 on the driven shaft. The outside diameter

of the contact surfaces is 240 mm and the inside dieameter 120 mm. Assuming uniform wear and

coefficient of friction as 025; calculate the maximum axial intensity of pressure between the discs for

transmitting 24 kW at 1575 rpm.

28. Mention the requirements of lubrication system of engines. Mention any three types of lubrication

syetem. What do you mean by crankcase ventilation ?

29. Mention any three types of combustion chamber used in petrol indicating their merits and demerits.

30. Draw and explain the curve representing variation of mixture requirements (fuel-air ratios) from no

load to full load in a S.I. engine.

31. What are the functions of the frame ? State why the frames narrower at the front and why it is

upswept at the front and rear. Give the layout of the components of the transmission system in 4-wheel

rear drive vehicle.

32. What are the different type of gear box? With a neat sketch discuss how the power flows through a 3-

speed gear box when the first gear and intermediate gears are engaged. With a neat sketch, explain the

working principle of constant mesh gear box.

33. A vehicle has wheel base of 25 m and weight 135 kN. The c.g. of the car is 115 m in front of the

rear axle and 08 m above the ground level. The vehicle has brakes on all the four wheels. If the vehicle

is moving up an inclination such that sin = 01 and = 05, determine : a) the load distribution

between front and rear axle. b) the distance at which it can be stopped while moving at a speed of 48

km/h, when only rear wheel brakes applied.

34. Describe battery ignition system with a diagram. What are the differences between battery ignition

and magneto ignition system ? What is the function of ignition system in a motor vehicle? What is the

importance of spark plug gap? What is the ignition advance? Which factors affect its variation?

35. Describe the construction and working of a telescopic shock absorber with sketch.

36. Draw the layout of an automobile and indicate the various components. Compare frameless and

unitary constructions of passenger car bodies. Explain their basic design features.

37. Describe the following engines : a)oppose cylinder engine b) oppose piston engine c)V engine

38. Describe the working of a two stroke engine with neat sketch. What do you mean by scavenging ?

State different types of scavenging used in two stroke engine.

39. Briefly describe construction and working of disc brakes. Compare them with conventional drum

type brakes.

40. Compare a four stroke engine and two stroke engines? Why two stroke engine is preferred for a two

wheeler?

41. What are the qualities that a piston must possess? Write the purpose of using piston rings?

42. How is wheel alignment done in automobile engineering? Explain it.

43. With suitable sketch explain the MPFI system?

44. What are the functions of suspension system?

45. Draw the layout of an automobile and indicate the various components.

46. What are the features of a good quality clutch?

47. A car using Ackerman steering system has a wheel base 2.85m, front wheel track 1.2m, distance

between king pin are 1.07m. If the maximum deflection of inner front wheel is 450, determine i) the

deflection of outer wheel assuming perfect rolling motion of the wheels in this position. ii) The turning

radius of outer front wheel.