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Internal Combustion Engines - Dec 18
Mechanical Engineering (Semester 5)
Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
Solve Any Four
(i) ip =33 kW (ii)bp=27kW (iii) Fuel used = 8 kg/h (iv) Temperature of cooling water outlet from engine = 75°C
(v) Inlet temperature of cooling water = 22°C
(vi) C.V.of fuel = 43 MJ/kg
(vii) Temperature of cooling water outlet from calorimeter = 48°C
(viii) Temperature of exhaust gas into of calorimeter = 528°C
(ix) Temperature of exhaust gas out of calorimeter = 87°C
(x) Room temperature (ambient temperature) = 24°C
(xi) Colling water flow rate through engine = 7 kg/mm
(xii) Colling water flow rate through calorimeter = 12 kg/mm
(xiii) A/F ratio on mass basis =20:1
(xiv) Specific heat of water = 4.18 kJ/kgK
Evaluate the following :(1) Specific heat of exhaust gas, from the given data (2) Draw the heat balance sheet on kW and percentage basis (3) Indicated, brake thermal and mechanical efficiencies. (4) Explain how and where you have made use of the First law of THermo-dynamics in the evaluations above. (5) Write the assumptions made.