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2003 Course Automobile Eng. (Elective II)

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Total No. of Questions : 12] P1320 [Total No. of Pages : 4 [3764]-156 B.E. (Mechanical S/W) AUTOMOBILE ENGINEERING (402063) (2003 Course) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 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) State the specifications of any one vehicle. [8] b) Explain with sketch the layout of four wheel driven automobile. What are its advantages and disadvantages over the conventional layout of automobile? [8] OR Q2) a) Discuss with sketch the construction and working of Centrifugal Clutch. [8] b) Discuss with sketch the construction, working and characteristics of Fluid Fly wheel. [8] Q3) a) Discuss with sketch the construction and working of synchromesh Gear Box. [8] b) Discuss the necessity of Gear Box in automobile with vehicle performance curves. [8] P.T.O. OR Q4) For typical motor car, the rolling resistance is given by 23N per 1000N, the air resistance by the expression 0.0827 V2, transmission efficiency 88% in top gear, car weighs 19934 N which fully loaded. Calculate a) The engine brake power required for a top speed of 144 km/hr. b) The acceleration in m/sec2 at vehicle speed of 48 km/hr, assuming the torque at 48 km/hr in the top gear is 25% more than at 144 km/hr. c) The engine power required to drive the car up a gradient of 1 in 5 at 48 km/hr, the transmission efficiency 80% in bottom gear. [16] Q5) a) Discuss with sketch the working of Torsion Bar Suspension System. What are its advantages/disadvantages as compared to other suspension systems? [8] b) Explain with sketch the working of Air Suspension System. What are its advantages/disadvantages as compared to Leaf Spring Suspension System in Buses? [10] OR Q6) Write short notes on any three: [18] a) Coil spring suspension system. b) The causes and remedies for the trouble Leakage of oil from the Gear Box . c) Helper Spring. d) Preventive maintenance Vs Breakdown maintenance in automobile. [3764]-156 -2- SECTION - II Q7) a) Give the requirements of road wheels? How the wheels and tyres designated? [8] b) What are the different types of steering gears used in steering system? Indicate their differences. [8] OR Q8) a) Explain briefly: i) Tilting steering wheel. ii) Collapsible steering column. [8] b) Discuss the various tyre troubles, likely to be encountered during [8] running of the vehicle, their causes and remedies. Q9) a) What two actions takes place as the rear spring compresses and expand, in so far as the propeller shaft is concerned? What two devices are used [8] to take care of these actions? b) What are the purposes of fine drive? Explain. How can the gear ratio of a final drive be determined? Explain. [8] OR Q10) a) Give the principal and working of a differential. Explain them with [8] help of figure. b) Explain briefly construction and working of propeller shaft used in automobiles. State purpose of slip joint and universal joint adopted on it. [8] Q11) a) Sketch the cross section of battery used in automobiles, describe the function of components of it and explain operation of it. [8] b) Explain briefly overrunning clutch drive type of starting system used [5] in automobiles. [3764]-156 -3- c) SI Engine does not crank or cranks too slowly . What are the causes and remedies? Explain. [5] OR Q12) Write short note on the following (Any three) : a) Testing of lead acid battery. b) Wheel cylinder and its construction. c) Air-brake system. d) Trouble shooting and diagnosis of automotive systems. e) Electronic Ignition System. rrr [3764]-156 -4- [18]

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