Compare Petrol and Diesel engine on the basis of: I. Fuel Ignition II. Thermal efficiency III. Fuel supply
[3 marks]What are the desirable properties of IC engine fuels?
[4 marks]Compare the knocking in SI and CI engines.
[7 marks]Why rich mixture required during idling?
[3 marks]What are the drawbacks of simple carburetor?
[4 marks]Explain construction and working of Bosch fuel pump.
[7 marks]Explain the working of common rail fuel injection system with a line diagram and also discuss about the advantages and disadvantages.
[7 marks]What is the importance of ignition lag in SI engine combustion?
[3 marks]Explain the advantages of using hydrogen as a fuel in IC engines.
[4 marks]Describe the various stages of combustion in CI engine with the help of p-𝜃 diagram.
[7 marks]Classify different types of combustion chambers in CI engine.
[3 marks]Explain the term: I. Vapor lock II. Ice formation
[4 marks]Explain the stages of combustion in SI engine with the help of p- 𝜃 diagram.
[7 marks]Give the classification of engine cooling system.
[3 marks]Give comparison between wet sum and dry sump lubrication system.
[4 marks]Derive an expression for air-fuel ratio for simple carburetor by using the approximate analysis method.
[7 marks]State the function of lubrication system in IC engine.
[3 marks]Compare and differentiate the supercharging and turbocharging.
[4 marks]Explain with neat sketch splash lubrication system.
[7 marks]Write a short note on SAE rating of lubricants.
[3 marks]Give comparison between the catalytic convertor and thermal rector.
[4 marks]Atwo stroke diesel engine was motored when energy meter reading was 1.5 KW. Then the test on the engine was carried out for one hour and following observations were recorded: Brake torque = 120Nm1 RPM = 600 Fuel used = 2.5 Kg/hr C.V. of fuel = 40.3 MJ/Kg Cooling water used = 818 Kg/hr Rise in cooling water temperature = 100C Cp = 4.2 KJ/Kg-K w Exhaust gas temperature = 3450C Room temperature = 250C A:Fratio = 32:1 Cp = 1.045 KJ/Kg-K g Draw heat balance sheet indicating units in KJ/min and also on percentage basis.
[7 marks]Explain the procedure of engine trouble shooting.
[3 marks]Write a brief note on Wankel engine.
[4 marks]In a test of four cylinder four stroke petrol engine of 75 mm bore & 100mm stroke. The following results were obtained at full throttle at a constant speed and with a fixed setting of the fuel supply of 0.082 kg/min. Brake power with all cylinder working = 15.24 KW Brake power with cylinder 1 cut off = 10.45 KW Brake power with cylinder 2 cut off = 10.38 KW Brake power with cylinder 3 cut off = 10.23 KW Brake power with cylinder 4 cut off = 10.45 KW Estimate the indicated power of the engine under this conditions. If calorific value of fuel is 44 MJ/Kg, find the thermal efficiency of the engine and compare it with air standard efficiency. The clearance volume is taken as 115 cc.
