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Tuesday, 17 June 2014

Automotive engines-Model question paper for B.E/B.Tech Mechanical Engineering


1(a) How does a 2-stroke cycle engine differ from a four-stroke cycle engine? (6 Marks)
(b) What is the advantage in keeping the exhaust valves and inlet valves open at the same time? (4 Marks)
(c) Explain briefly the working of an automobile gas turbine with a diagram. (6 Marks)
(d) Explain Liquefied Petroleum Gas. Mention some advantages of using this in spark-ignition engines. (4 Marks)
2 (a) What is a splayed crankpin? Draw the crankshaft with splayed crankpins for a V-8 engine. (6 Marks)
(b) Describe the procedure to adjust valve clearance in the I-head engine. (4 Marks)
(c) Explain the method to minimize the crankshaft torsional vibration. (4 Marks)
(d) Explain the function of a vibration damper with a sketch. (6 Marks)
3(a) What are the products of combustion for gasoline? How are they produced? (8 Marks)
(b) Explain the phenomena of knock in a spark-ignition engine. (4 Marks)
(c) Describe how pre-ignition differs from detonation. (4 Marks)
(d) What are the various factors that influence the flame speed? (4 Marks)
4 (a) What are the various types of mufflers? Explain a combined resonance and absorber type muffler with a diagram. (8 Marks)
(b) How is the speed of the engine controlled by the throttle? (4 Marks)
(c) Draw neatly the lay-out for the fuel feed system of an automobile and name its various parts. (4 Marks)
(d) What are the functions of the inlet manifold and the exhaust manifold in an automotive engine? (4 Marks)
5 (a) What is the purpose of the control rod? How does it vary the fuel supply to the injector? (6 Marks)
(b) Explain the working of a primary and a secondary diesel fuel filter. Describe any filter of each type. (6 Marks)
(c) Why is a fan used in the engine cooling system? Explain different methods of controlling the speed of a fan. (4 Marks)
(d) State the specifications for the cooling system of any car engine. (4 Marks)
6 (a) Why is the filter used in the engine lubricating system? Describe the working of a full-flow pressure oil filter. (8 Marks)
(b) Describe how inner walls of the cylinder are lubricated in the splash system. (4 Marks)
(c) Explain the oil additives used for engine oils. (4 Marks)
(d) What are the common troubles encountered in the lubricating system of an engine? (4 Marks)
7 (a) What is ignition advance? On what factors does it depend? (4 Marks)
(b) What are the problems encounters in a high tension coil? (4 Marks)
(c) Name the different types of electrodes in spark plugs and explain their uses. (4 Marks)
(d) Describe the principle of Hall effect and how this effect is applied in the sensor of the electronic distributor. (8 Marks)
8 (a) In what way does the altitude affect the air-fuel mixture of the engine? What is the special device used in high altitude regions? Describe the device with a neat sketch. (8 Marks)
(b) Explain how a three-way catalytic converter is employed to convert polluted exhaust gases into harmless gases. (4 Marks)
(c) What is the purpose of the charcoal canister? (4 Marks)
(d) A four-cylinder diesel engine produces indicated horse power of 120 kW and delivers a brake horse power of 95 kW. Calculate the machinal efficiency and frictional horse power. (4 Marks)


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