Question 3 a) A 4-stroke, 4-cylinder 2.0 litre gasoline engine has a compression ratio of 8.5 and operates at 1000 rpm. The thermodynamic cycle of the engine is modelled as an air- standard Otto cycle with constant specific heats (C,=1.005 kJ/kg-K, cv=0.718 kJ/kg-K, k=1.4). At the beginning of compression, the air is at 100 kPa and 295 K and the maximum temperature in the cycle is 2000 K. Determine: i) the mass flow rate of air. ii) the engine power output. iii) the thermal efficiency.

An Otto cycle engine operates with the cycle shown below. The air in the engine can be considered a perfect gas with k = 1.402, R = 0.28 kJ/kgk and cv = 0.71 kJ/kgK. The engine has the following known states: State 1: P₁ = State 2: T₂ = 725K, rc = 9 State 3: T3 = 2196.1 K P 1bar, V₁ = 0.5x10-³ m³, T₁ = 300K 2 Answer: 4 V What is the specific internal energy at state 1? Please enter your answers in kJ/kg

Task 1 A V-8 Spark ignition engine has a 10 cm diameter bore and 10 cm stroke. At the beginning of compression process air is at 95 KPa and 27 Degree Celsius. 750 KJ/Kg of heat was transferred to air during heat addition process. The compression ratio is 8. Consider the variation of specific heats with temperature. A. Describe with the aid of diagrams the operational sequence of four stroke spark ignition engines B. Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines C. What is the difference between four and two stroke spark ignition engines? D. Explain the relationship between thermal efficiency (n) and compression ratio (r). E. Why are high compression ratios not used in spark ignition engines? F. Determine the net-work output per cylinder per cycle (KJ) G. Determine the efficiency of the engine. H. Determine the Mean Effective Pressure (kPa) I. What is the Power Output of the engine running at 2000 rpm. Task 2 A compression ignition engine operates…

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