During which phase of a four-stroke engine are waste gases removed? A) combustion stroke B) exhaust stroke C) intake stroke D) power stroke
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During which phase of a four-stroke engine are waste gases removed? A) combustion stroke B) exhaust stroke C) intake stroke D) power stroke
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- Q4) Diesel engine four stroke, five cylinder operating at air fuel ratio 14.5 and engine time is 6.9 *10.5,^-5 sec/deg. Fuel injection occurs from 20° BTDC to 5° ATDC. The engine has a volumetric efficiency of 0.95 with fuel equivalence ratio of 0.8 and mass of air=718g. Calculate 1) displacement volume. 2) RPM. 3) time for one injection. 4) fuel flow rate through an injector. * Vd=62 litter , RPM= 2400, t= 0.00137sec/injection mf=22.9 g Vd=64 litter, RPM= 2400, t= 0.00137sec/injection mf=22.9 g Vd=64 litter, RPM= 2420, t= 0.00137sec/injection mf=22.9 g Vd=64 litter, RPM= 2400, t= 0.0137sec/injection mf-22.9 g Vd=64 litter, RPM= 2400, t= 0.00137sec/injection mf=22.5 gEnumerate the advantages and disadvantages of the following types of engine: a) Four-stroke engineb) Two-stoke enginec) Rotary or Wankle engineB.) the net work per cycle per cylinder and the thermal efficiency of the cycle c.) the mean effective pressure d.) power output for an engine speed of 3000 rpm
- 1. Based on various gas turbine configurations (i.e turboprop, turbojet, turbofan, turboshaft), indicate which engine type would be most applicable for the following aerospace applications, and why it is the most appropriate i) Military application of the Joint Strike Fighter (JSF) ii) A short range commercial flight, i.e. Cardiff to Dublin iii) A hypersonic unmanned aerospace vehicle (UAV) iv) A long range commercial flight, i.e. London-New YorkQ1) What is the meaning of chemical reaction? Write an example of a chemical reaction Q2) Mention the basic flame types and write an example of each type Q3) Compare between wood, lignite and peat in terms of carbon content and calorific value Q4) A small, low emission, stationary gas turbine engine operates at full load (3950 KW) at an equivalence ratio of 0.286 with an air flowrate of 15.9 kg/s. The equivalent composition of the fuel (ethane) is C2 H6. Determine the fuel mass flowrate and the operating air-fuel ratio for the engine. Q5) A gas-stream at 1 atm contains a mixture of CO, CO2 and N, in which the CO mole fraction is 0.15 and the CO2 mole fraction is 0.25. The gas-stream temperature is 1100K. Determine the absolute enthalpy of the mixture on both a mole basis and a mass basis. Also, determine the mass fractions of the three component gasesa) Why should the piston speed be limited in a range between (5 - 15) [m/s]? b) What are the main differences between four stroke and two stroke engines? c) Why always in production of engines the inlet valves are larger than exhaust valves? d) What are the main differences between Otto and Diesel Cycles?
- The knocking in S.I engine increases with a) increase in inlet temp b)increase in compression ratio c)bothb) Explain how the following jet engine works. Refer to each section of the engine and explain the purpose of each section. COMPRESSION COMBUSTION EXHAUST INTAKE Air.Inlet Compression Combustion Chambers Turbine Exhaust Cold Section Hot Section Figure Q4bc) end of compression stroke 5- Match List-I (Performance Parameter Y) with List-II (Curves labelled 1, 2. 3, 4 and 5 BHP vs. Y) regarding a C.I engine run at constant speed and select the correct answer using the codes given below the lists: d) none of the List II (Curves BHP vs. Y) List I A. Total fuel consumption rate B. Mechanical efficiency C. Indicated power D. Brake specific fuel consumption Codes: A BC D (a) 5 3 4 2 (b) 1 3 4 2 (c) 5 4 2 3 (d)1 4 2 3 BHP
- 1. Discuss an Internal combustion Engine? 2. Briefly explain a 2 and 4 stroke Engines and how each operation. Add a caption... > Status (Contacts)B) Why A two stroke cycle engine gives double the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.intake vaive iii) iv) intake vi) on covers the compression laru Tuel injector power The diagrams show the cylinder of a petrol engine in 4 stages. Petrol vapour and air are drawn into the cylinder, The mixture is then squeezed together, and then exploded by a spark. The explosion pushes down the piston. The exhaust gases are then expelled from the cylinder. exnaust vaive 010 Use the first law of thermodynamics to analyse the energy changes during the process. At each stage explain what happens to the pressure of the gas; exhaust the temperature of the gas; the number of molecules in the cylinder; the internal energy of the gas; the work done on or by the gas: the thermal energy exchanged with the environment. [AC 4.3]