Why Otto cycle is called constant volume cycle?
[3 marks]Explain the following terms as applied to IC Engine:
[4 marks]Bore (ii) Stroke (iii) TDC (iv) Swept Volume
[ marks]What do you mean by IC Engine? How they are classified?
[7 marks]Give justification for the following:
[3 marks]IVO before TDC (ii) IVC after BDC.
[ marks]Discuss briefly blowdown losses as applied to I.C. engines.
[4 marks]Explain with suitable sketch different methods of supercharging.
[7 marks]Explain construction and working of simple carburettor with neat sketch.
[7 marks]What is difference between actual cycle and fuel air cycle for CI Engines?
[3 marks]List advantages and limitations of pulse turbocharging.
[4 marks]Explain briefly Exhaust Gas Recirculation for IC Engines.
[7 marks]Define the following term: (i) Octane number (ii) Cetane number
[3 marks]Describe the cause of HC emissions from SI and CI engines.
[4 marks]Explain the working of Bomb Calorimeter with neat sketch.
[7 marks]What is ignition advance in SI Engine? Why it is necessary in ignition system?
[3 marks]Explain with neat sketch splash lubrication system.
[4 marks]With the help of P-θ diagram, explain the different stages of combustion in Spark-ignition engines.
[7 marks]Discuss the function of a lubricant in an engine.
[3 marks]Explain briefly the pressurized water cooling method.
[4 marks]What do you mean by ignition delay? How does it affect the knocking tendency in a CI engine?1
[7 marks]What are the advantages of diesel power plant over steam power plant?
[3 marks]Draw neat sketch of pintaux nozzle and discuss its merits.
[4 marks]The following observations were made during a test on diesel engine: BP = 32 kW m = 10 kg/hr f Flow rate of cooling water = 530 kg/hr Rise in temperature of cooling water = 50°C CV of fuel = 44000kJ/kg A:F = 20:1 Ambient temperature = 20°C Exhaust gases are passed through an exhaust gas calorimeter. Flow rate of water through calorimeter is 450kg/hr and its temperature rise by 40°C. The exhaust gas leaves the calorimeter at 90°C. Prepare a heat balance sheet on minute and percentage basis. Take: C (water) = 4.2 kJ/kg.K & C (exhaust gas) = 1.005 kJ/kg.K p p
[7 marks]What is Willan’s line method? For which type of engine it is applicable?
[3 marks]Give the basic comparison between battery ignition and magneto ignition system.
[4 marks]Afour cylinder four stroke engine have 10cm bore and 14cm strokes runs at 4000rpm. A:Fratio supplied to engine is 16:1 with volumetric efficiency of 75%. Manometer shows reading of 12cm of mercury causing the air flow through the ventury. Find diameter of ventury and nozzle orifice. Neglect the compressibility of air. Take: C = 0.85, C = 0.75, da df ρ = 1.25 kg/m3, ρ = 750 kg/m3, ρ = 13600 kg/m3 a f mercury
