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2003 Course Automobile Eng. (Elective)

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Total No. of Questions : 12] P1313 [Total No. of Pages : 3 [3664]-146 B.E. (Mechanical S/W) AUTOMOBILE ENGINEERING (2003 Course) (Elective) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates:1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) What are the main components of automobile? Describe all of them in brief. [8] b) Explain with sketch the rear engine and rear wheel drive layout. What are the advantages and disadvantages of this layout over the conventional layout of automobile. [8] OR Q2) a) b) Discuss with sketch the construction and working of single plate clutch. [8] Discuss the causes and remedies for the trouble : [8] i) ii) Q3) a) b) c) Clutch drag. Clutch judder. Discuss with sketch the construction and working of sliding mesh type of gear box. [8] Write a short note on Lubrication of Gear Box . [4] Explain the following : [4] i) Draw bar pull. ii) Transmission Efficiency. P.T.O. OR Q4) A Leyland truck has a gross vehicle weight of 89026 N. Engine power is 77.3 kW at governed speed of 2400 RPM and maximum torque is 345.8 Nm at 1400 RPM. Rear Axle Ratio is 6.166:1. Fourth speed reduction ratio in transmission is 1.605:1. Drive line losses amount to 10.7 kW at 2400 RPM and 6.3 kW at 1400 RPM. Effective wheel diameter is 0.95 meter. Frontal area of truck is 6.95 m2. Calculate the grades which the vehicle can climb in fourth gear. a) At governed engine speed. b) At speed of maximum torque in the equation R = krW + kaAV2 where kr = 0.014 and ka = 0.0462 where V in km/hr. [16] Q5) a) b) c) Discuss leaf spring suspension with a neat sketch. [7] Discuss the construction and working of shock absorber with a neat sketch. [7] What is sprung weight and unsprung weight? Why unsprung weight is kept as low as possible? [4] OR Q6) Write short notes on any three : [18] a) Torsion Bar. b) Helper spring. c) Causes and Remedies for trouble rough ride . d) Air suspension. SECTION - II Q7) a) b) Describe with help of simple diagram the general arrangement of the steering system. [8] State different types of wheel rims used in auto-mobiles. Give Disc wheel Nomenclature. [8] OR [3664]-146 2 Q8) a) b) Describe with help of a neat sketch, the working of power steering unit used in modern automobiles. [8] Explain the following : [8] i) Trade pattern used in tyres. ii) Wheel balancing. Q9) a) Describe principle and working of a differential, used in vehicles, state clearly purpose of using it in automobiles. [8] b) Differentiate between cross type and ball & trunnion type universal joint. Explain briefly construction of the propeller shaft. [8] OR Q10)a) Explain the construction and operation of any one double reduction [8] axle used in final drive. b) Describe and explain with help of sketch wheel cylinder and its construction used in braking systems. [8] Q11)a) Explain with sketch principle and working of air operated brake system. [8] b) Draw a diagram of simple two pole shunt wound generator and explain its construction and working. [10] OR Q12)Write short note on following (any three) : a) Principle of CUTOUT used in Automotive electrical system. b) Automotive lamps. c) Wind screen wiper. d) Brake fluid. e) Maintenance schedule of automobile. vvvv [3664]-146 3 [18]

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