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Reg. No. : ..................................... Name : ..........................................
Third Semester B.Tech. Degree Examination, November 2009 (2008 Scheme) Branch : MECHANICAL – AUTOMOBILE ENGINEERING 08.305 : Auto Chassis (U) Time : 3 Hours
Max. Marks : 100 PART – A
Answer all questions. Each question carries 4 marks. 1. Give a brief history of automobiles . 2. List the various components of a chassis . 3. What do you understand by understeering and oversteering ? 4. Briefly explain the necessity of providing the suspension system in vehicles . 5. Why are universal joints employed at the joints of the rear axles ? 6. Define caster angle. What is the purpose of this angle ? 7. Justify the need for variable rate spring for heavy duty commercial vehicles . 8. Explain the principle applied in the hydraulic brake system . 9. What are the relative advantages of disc brakes over shoe brakes ? (10×4=40 Marks)
10. What are the causes of tyre wear ? PART – B
Answer one question from each Module. Each question carries 20 marks. MODULE – I 11. a) Compare the chassis and body construction of tractor and trucks. b) Explain safety features in modern automobiles and describe their road testing.
10 10 P.T.O.
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8220 12. a) Describe the following types of steering gears : i) Worm and sector steering gear ii) Cam and roller steering gear
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b) Explain the working of a typical hydraulically operated power steering system.
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MODULE – II 13. a) Sketch a typical passenger car rear independent suspension in which rear wheels are driving. Mention its advantages and limitations. b) Describe the construction and function of a Mac Pherson strut suspension with a neat diagram.
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14. Prepare short notes on following : a) Final drive b) Torque-tube drive c) Oil Retention (4×5=20 Marks)
d) Torque rod. MODULE – III
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15. a) Give a description of roller brake testing machine.
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b) Describe with a layout diagram the air brake system.
16. a) Distinguish between normal and radial ply tyres. What are advantages of radial ply tyres ? 10 b) Briefly explain the construction of a pneumatic tyre with the help of a cross sectional view of the tyre.
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(3×20 = 60 Marks) ————————