State the function of following I.C.engine components. 1 Cylinder head 2 Spark plug 3 Fuel pump 4 Radiator 5 Flywheel 6 Dynamic oil seal 7 Supercharger 8 Governor 9 Piston pin 10 Piston rings 11 Combustion chamber 12 Cam & follower set 13 Carburetor 14 Injector
Define Air standard, Fuel air and Actual cycle.
[3 marks]Explain with a neat sketch the working of two stroke engine.
[4 marks]Explain with neat sketch actual valve timing diagram of diesel engine for law and high speed.
[7 marks]Explain with P-Vdiagram the effect of variable specific heat on Otto, Diesel and Dual cycle.
[7 marks]List assumptions for fuel air cycle.
[3 marks]List the losses in actual fuel-air cycle and explain any three in detail.
[4 marks]Draw a schematic diagram of Bosch type fuel pump and explain its working.
[7 marks]Define Rich, Lean and Stoichiometric A:Fmixture.
[3 marks]Compare Battery and magneto ignition systems.
[4 marks]Describe the construction and explain the working of Junkers’ gas calorimeter.
[7 marks]Explain detonation in C.I. engine.
[3 marks]Give the various types and applications of lubrication and cooling system in I.C.engine.
[4 marks]Explain stages of combustion in C.I. engines. OR1
[7 marks]Compare liquid and air cooled systems.
[3 marks]State the different methods of supercharging and discuss any one of them with figure.
[4 marks]Design the size of the fuel orifice to give an air fuel ratio 13:1. The venturi throat is 3.5 cm in diameter and the vacuum at the venturi is 6.5 cm of Hg. Take C = 0.92 and C = 0.95. The air temperature and da df pressure at the carburetor entrance are 1 bar and 293 K. The fuel orifice is at the same level as that of the float chamber fuel level. Take density of fuel as 750 kg/m3.
[7 marks]What are the major difficulties to be faced if a single jet carburetor is used?
[3 marks]State two merits and two demerits of diesel engine power plants.
[4 marks]A 4-cylinder, 4-stroke petrol engine 6 cm bore and 9 cm stroke was tested at constant speed. The fuel supply was fixed to 0.13 kg/min and plugs of 4-cylinders were successively short-circuited without change of speed. The power measurements were as follows: With all cylinder working=16.25 kw With No.1st –cylinder cut-off =11.55 kw With No.2nd –cylinder cut-off =11.65 kw (BP) With No.3rd –cylinder cut-off =11.70 kw (BP) With No.4th –cylinder cut-off =11.50 kw (BP) Find (a) The IP of engine (b) Mechanical efficiency (c) Indicated thermal efficiency if CV of fuel used is 42000 kj/kg. Assume clearance volume 60 cu.cm.
[7 marks]Write a short note on air pollution due to IC engines.
[3 marks]Explain the method of obtaining I.P. of multi-cylinder engine by Morse Test.
[4 marks]Explain and draw up the heat balance sheet with necessary equations to represent the heat distribution on minute and percentage basis.
[7 marks]