In a diesel engine, the fuel injection takes place Select one: O a. At the end of exhaust stroke O b. At the beginning of induction stroke O C. At the end of compression stroke. O d. At the end of working stroke
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- Explain working method of rotary distributor injection pump of diesel engines.define the concept of Combustion or reaction efficiency in thecontext of an ICE hybrid engine3 litters, 4 cylinders engine, multipoint port fuel injection, one for each cylinder. AF ratio is 14.6, the volumetric efficiency is 90%. The engine speed at idle condition is 550 rpm with stoichiometric gasoline and inlet pressure is 30 kPa. But the engine speed is 5900 rpm with stoichiometric gasoline of maximum power, the inlet pressure is 101 kPa. Calculate the following: a. mass air flow rate in one cylinder at maximum speed, b. mass fuel flow rate into one cylinder through an injector, c. mass air flow into one cylinder at idle speed, d. mass fuel flow rate into one cylinder at idle speed, e. injection pulse duration is seconds at idle conditions at idle, f. injection pulse duration is degrees of engine rotation at idle conditions.
- List three alternative fuels for an internal combustion engine and briefly explain where they come from.a. What is the specific brake work (kJ/kgfuel) of a 4 L single-cylinder propane engine operating stoichiometrically, if the heat transfer to the coolant is 17 kW, the air and fuel enter the engine at 298 K, the exhaust is 700 K, and the propane mass flow rate is 1.2 g/s? b. A four-stroke 6 L engine is fueled lean with methane at an equivalence ratio ? = 0.8. It operates at 2000 rpm with a volumetric efficiency of 0.80. The exhaust temperature is 800 K, and the heat transfer to the coolant is 3.4 ×105 kJ/kmolfuel. What is the engine’s thermal efficiency and power?What is the injection duration (deg) needed for fuel injection in a single cylinder diesel engineoperating at 1450 rpm so that the engine produces 52 kW? The engine bsfc is 0.25 kg/kWh. Assumeincompressible fuel flow, an average cylinder pressure of 60 bar during the fuel injection, an injector effectivearea ?f = 1.5 mm2, and an injection pressure equal to 560 bar.
- The injector function in diesel engine is to a. inject fuel continusously when engine is running. b. inject fuel at the beginning of comprssion stroke c. inject fuel at the end of expansion stroke d. inject fuel at end of compression strokewhat is compression ration in engine?For Diesel engine, the turbocharger will increase the pressure of a. air fuel mixture entering into cylinder O b. air and exahust gases entering into cycliner. O c. air entering in to cylinder. d. fuel entering into engine cylinder
- What is the injection duration (deg) needed for fuel injection in a single cylinder dieselengine operating at 1500 rpm so that the engine produces 50 kW? The engine bsfc is 0.22kg/kWh. Assume incompressible fuel flow, an average cylinder pressure of 50 bar duringthe fuel injection, an injector effective area ?f = 1.0 mm2, and an injection pressureequal to 550 barwhat does I.B.C stand for in relation to diesel enginesWhich of the following statements is/are TRUE? I. Diesel engines have higher thermal efficiencies than Otto engines for the same compression ratio. II. Otto engines typical operate at low compression ratios to prevent autoignition of the fuel-air mixture. a. I only b. Neither I nor II c. II only d. Both I and II