MODEL QUESTION PAPER
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1 MODEL QUESTION PAPER B.E. AUTOMOBILE ENGINEERING SEMESTER V AT AUTOMOTIVE TRANSMISSION Time: 3 Hours Max. Marks: 100 Answer ALL Questions PART A (10 x 2 = 20 Marks) 1. What are the requirements of a transmission system? 2. Explain the reasons for using cone as engaging surface in cone clutch. 3. Describe the procedure for arriving of suitable gear ratios for Tractors. 4. Differentiate Torque Converter and Fluid Coupling. 5. How the torque ratio of a torque converter varies with speed ratio? 6. Compare the performance characteristics of different hydraulic pumps and hydraulic motors combinations. 7. List out the merits and demerits of Hydrostatic drive. 8. What are the advantages and limitations of electric drive? 9. Explain Automatic and Semi-Automatic transmission. 10. Write a brief note on Automatic Overdrive. PART B (5 x 16 = 80 Marks) 11. Sketch the Wilson planetary gearbox. Explain clearly how the third gear ratio is obtained for this gearbox.
2 12. a) Explain the construction and operation of diaphragm spring clutch with a neat sketch. (OR) 12. b)i) Sketch and explain the variation of Tractive effort with vehicle speed. ii) Explain the necessity of gearbox for a vehicle using performance curves analysis. 13.a) Differentiate Multistage and Poly phase torque converter. Sketch and explain the performance characteristics for the above two types of torque converters. (OR) 13.b) Sketch and explain WHITE s hydro torque drive. 14.a) Explain the Janny hydrostatic transmission with a sketch. (OR) 14.b) With a circuit diagram explain the operation of Electric drive f or city buses. 15.a) With a basic hydraulic circuit diagram, explain the functions of various valves while engaging second gear. (OR) 15.b) Describe Chevrolet Turbo glide automatic transmission system. * * * * *
3 E B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Fifth Semester Automobile Engineering AT 335 AUTOMOTIVE TRANSMISSION Time: Three hours Maximum : 100 marks Answer ALL the questions. PART A (10 2 = 20 marks) 1. What are the requirements for an automotive clutch? 2. With a sketch illustrate the principle of friction clutch. 3. Draw the layout of sliding mesh gear box. 4. What Find out the axial force required to synchronize the speeds. Given coefficient of friction = 0.04, cone angle is 10 degree, angular acceleration is 50 rad/sec², moment of inertia 254 kg cm² and the mean radius of the cone surface 4.13 cm. 5. A petrol engine develops 10 N-m torque at a maximum BHP speed of 4000rpm. Determine the diameter of the impeller required to transmit the torque for a slip of 3%. 6. What is meant by drag torque? Explain a method of minimizing it? 7. How the efficiency of a torque converter varies with speed ratio? 8. What are the different types of hydrostatic transmission combination? Specify the features of them. 9. Write a note on new generation hydraulic actuation system of a clutch? 10. List out the merits and demerits of electric drive.
4 PART B (5 16 = 80 marks) 11. The b.p of a vehicle is 94.2 kw at 3300 rpm. The total tractive resistance on low gear including gradient resistance is N and that in the top gear is 1697 N. the diameter of the wheels is m and the efficiency of the transmission is 75% on low gear and 85% in top gear. Calculate the gear ratio for a three-speed gear box. 12. (a) Explain the principle of operation of hydrodynamic fluid coupling with relevant sketch. (b) Explain the principle of operation of hydrodynamic torque converter with a polar diagram. 13. (a) Explain how second gear is obtained in Wilson gear box with a neat sketch. Deduce the second gear ratio. (b) How shift valves are controlled by throttle and governor valves / with a hydraulic circuit explain how second gear is engaged? 14. (a) Describe Janny hydrostatic transmission system with a neat sketch. (b) Explain the principle of modified ward Leonard type of control for electric drive in vehicles. 15. (a) Explain the construction and operation of single plate diaphragm spring clutch with a neat sketch. (b) Explain Chevrolet turbo glide automatic transmission system with a sketch.
5 K B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER Fifth Semester Automobile Engineering AT 335 AUTOMOTIVE TRANSMISSION Time: Three hours Maximum: 100 marks Answer ALL the questions. PART A (10 2 = 20 marks) 1. Enumerate the various requirements t be satisfied by a clutch. 2. What are the main functions to be performed by the vehicle transmission system? 3. Write the requirements to be satisfied by automatic transmission fluids. 4. Write the advantages of fluid coupling. 5. Write the advantages of epicyclic gear system. 6. What is meant by drag torque and how it can be reduced? 7. Write the advantages of hydrostatic drives. 8. Brief about the advantages of electric drives in a automatic vehicle. 9. Brief about the controls used in Toyota ECT-i automatic transmission with intelligent control system. 10. write the advantages of diaphragm type of clutch
6 PART B (5 16 = 80 marks) 11. A truck has a gross vehicle weight of N. engine displacement is 10m 3, power 77.3kW at governed speed, of 2400 r.p.m. maximum torque, Nm at 1400r.p.m. Rear axle ratio, 6.166: 1. fourth speed reduction ratio in transmission,1.605 :1, drive line losses amount to 10.7kW at 2400r.p.m and 6.3kW at 1400r.p.m.type size m x1.016m(effective wheel diameter 0.950m),frontal area of truck 6.95mcalculate the grades which the vehicle can climb in fourth gear in still air conditions. (i) At governed engine speed; and (ii) At speed of maximum torque, in the equation R = KW +Ka A V² Ka= where V in km/hr 12. (a) By using the line sketch explain the working of hydrodynamic torque converter. () (b) Draw graph for characteristics of a conventional three element converter by using this explain the general properties of the hydrodynamic torque converter. 13. (a) describe the working principle of ford model T planetary transmission () with a suitable sketch. (b) Explain the working principle of Wilson planetary transmission. Draw neat line sketch of the system. 14. (a) By using simple line sketch explain the working of janney hydrostatic drive. () (b) Describe the working of early ward Leonard control system. 15. (a) Describe the working of Chevrolet turboglide transmission. () (b) Describe the construction and working of single plate spring clutch
7 S 202 B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY Fifth Semester Automobile Engineering AT 335 AUTOMOTIVE TRANSMISSION Time: Three hours Maximum: 100 marks Answer ALL the questions. PART A (10 2 = 20 marks) 1. What is meant by double deducting? 2. How clutches are classified? 3. What is the principle of synchronizing? 4. What are the differences between fluid coupling and torque converter? 5. Define slip with respect to torque converter. 6. State some advantages of hydrometric transmission. 7. What are hydrostatic transmission combinations? 8. What is meant by turbo glide? 9. What is meant by intelligent control? 10. Compare a mechanical clutch with fluids coupling. PART B (5 16 = 80 marks) 11. In a gear box the clutch shaft pinion has 14 teeth and low gear main shaft pinion 32 teeth. The corresponding lay shaft pinions have 36 teeth and 18 teeth. The axle ratio is 3.7:1 and effective radius of the rear type is 35.5 cm. calculate the car speed in the above arrangement at an engine speed of 2500rpm.
8 12. (a) (i)discuss various type of gear boxes used in an automobile. (6) (ii) What is a synchronizing device? How this device helps smooth gear engagement. (10) (b) (i) What is the functions of a clutch? (3) (ii) Draw a neat sketch of a centrifugal clutch and explain its construction and operation. (13) 13. (a) What is a fluid coupling? Explain its constructional details. Draw and explain its performance curves. (16) (b) Draw a neat sketch of a multistage torque converter and explain its construction and working principle. (16) 14. (a) (i) What is meant by automatic drive? (4) (ii)draw a schematic diagram of hydraulic control system for automatic transmission and explain. (12) (b) (i) What are the principles involved in hydrostatic drive? What are it advantages and limitations? (8) (ii) Compare hydrostatic and hydrodynamic transmission. (8) 15. (a) Draw a neat sketch of a Chevrolet Turbo glide transmission and explain its salient features. (16) (b) (i) Discuss about Toyota ECT-i Transmission. (8) (ii) Discuss about Hydraulic Actuation system. (8)
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