JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year AUTOMOBILE ENGINEEIRNG Previous Question Paper (November/December - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What is the need of lubrication and explain various systems of lubrication?
Answer
Lubrication is needed to reduce friction between moving parts, minimize wear, dissipate heat, and act as a seal between piston rings and cylinder walls. The main systems are: 1) Mist lubrication (oil mixed with fuel), 2) Wet sump lubrication (oil stored in a sump), and 3) Dry sump lubrication (oil stored in an external tank).
What is the function of injector?
Answer
The injector is responsible for atomizing fuel into a fine mist and injecting it at high pressure into the combustion chamber or intake manifold at the precise timing required for efficient combustion.
What happens, if thermostat does not function?
Answer
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What is the function of condenser in ignition system?
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What are the advantages of epi-cyclic gearing?
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What are the applications of torsion bar?
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What properties to be considered for braking fluid?
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Why camber is to be provided?
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What are the dis-advantages of hydrogen as fuel in vehicles?
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What are the advantages of CNG over other fuels?
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Part B
Sketch and explain the working of zenith carburetor.
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What are the various types of air-cleaners used in fuel supply system and mention their relative merits?
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Explain with a layout the fuel supply system in diesel engines.
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Sketch and explain the working of fuel feed pump used in diesel engine.
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What are the advantages of pressurised cooling system over other methods?
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Differentiate between pump cooling systems with thermo-syphon system.
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Explain with a block diagram the working of battery ignition system.
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Explain the working of Bendex-drive used for starting of engine.
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Differentiate between single plate clutch with multi-plate clutch mentioning principle of working and applications.
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Explain the working of Differential gear box and mention its advantages.
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What are the various types of tyres used on automobiles and explain the importance of bias ply type carcas tyres?
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Explain with a neat sketch the construction and working of telescopic type shock absorber.
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How the skidding of wheels occur? Explain various methods employed to avoid skidding.
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How the brakes are classified? Explain their advantages and applications.
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What are the various steering mechanisms used on vehicles and explain about Ackerman’s steering mechanism?
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Explain about the importance of king pin rake and combined angle toe-in.
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What are the advantages of multi-point fuel ignition system used for S.I. engines?
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What are the various ingredients present in the I.C engine emission and explain the standards to be maintained?
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Differentiate between liquid and gaseous fuels used in automobiles mentioning properties relative advantages and applications.
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Why hydrogen is not popular fuel to use in automobiles?
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