Q16 An engine working on the Otto cycle has an air standard efficiency of(56%) and rejects (544 Kj/Kg) of air. The pressure and temperature of air at thebeginning of compression are (0.1 MPa) and (60 °C) respectively. Compute (a) thecompression ratio of the engine (b) the work done per kg of air (c) the pressure andtemperature at the end of compression and (d) the maximum pressure in the cycle.Answers: (a) 7.79 (b) 692.36 Kj/Kg (c) 1770.7 KN/m², 756.9 K (d) 5798.93 KN/m²

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Answered: Q16 An engine working on the Otto cycle…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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The compression ratio in an air standard Otto cycle is 9. At the beginning of the compression stroke, the pressure is 0.1 MPa and the temperature is 21 C. The heat transfer to the air per cycle is 2000 kJ/kg. Use the PG model for air. I am trying to find the Mean Effective Pressure from this information
An air-standard dual cycle has a compression ratio of 8.6 and displacement of Vd = 2.2 L. At the beginning of compression, p1 = 95 kPa, and T1 = 290 K. The heat addition is 4.75 kJ, with one quarter added at constant volume and the rest added at constant pressure. Determine: a) each of the unknown temperatures at the various states, in K.b) the net work of the cycle, in kJ.c) the power developed at 3000 cycles per minute, in kW.d) the thermal efficiency.e) the mean effective pressure, in kPa.
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Q1/ An air-standard Otto cycle has a compression ratio of 8.5. At the beginning of compression, p;=100 kPa and T;=310 K. The heat addition per unit mass of air is 1440 kJ/kg. Determine (a) the net work. in kJ per kg of air. (b) the thermal efficiency of the cycle. (c¢) the mean effective pressure. in kPa. (d) the maximum temperature in the cycle, in K.
Q9 An engine working on the Otto cycle has an air standard efficiency of (56%) and rejects (544Kj/Kg) of air. The pressure and temperature of air at the beginning of compression ratio are (0.1 MPa) and (60 °C) respectively. Compute (a) the compression ratio of the engine. (b) the work done per Kg of air. (c) the pressure and temperature at the end of compression and (d) the maximum pressure in the cycle. Answers: (a) 7.79, (b) 692.3 Kj/Kg, (c) 1770.7 KN/m², 756.9 K, (d) 5798.9 KN/m²
5. (a) If the compression ratio of an engine working on Otto cycle isIncreased from 5 to 7, find the percentage increase in thermalefficiency. (b) Derive an expression for thermal efficiency of ideal Brayton cycle.(c) In an engine working on the ideal Otto cycle, the pressure and temperature at the beginning of compression are 100 kPa and 40 °C respectively. The ratio of specific heat capacities is 1.4. If the airstandard efficiency of the engine is 50%, determine(i) The compression ratio. (ii) The pressure and temperature at the end of adiabaticcompression. (6a) Explain and discuss in your own words, the following three concepts incombustion: stoichiometric mixture of air and fuel, weak mixture and richmixture. Explain their importance in combustion applications.(6b) A gas fuel has the following volumetric composition:Propane C3H8: 73 %Butane C4H10: 5 %Ethane, C2H6: 3%Nitrogen N2: 19%(i) Write out the complete combustion equations for all the combustible constituents individually.…
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Cylinder conditions at the start of compression in a spark ignition engine operating atwide open throttle on an air-standard Otto cycle are 60oC and 98kPa.The engine has a compression ratio of 9.5:1 and uses petroleum with an air-fuel ratio(AF) of 15.5.Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual.If the petroleum has a heating value (QHV) of 43kJ/kg,Calculate the following: 1) Temperature in oC and Pressure in kPa at all states in the cycle 2) Specific work done during the power stroke in kJ/kg 3) Heat added during combustion in kJ/kg 4) Net specific work done in kJ/kg5) Indicated thermal efficiency
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