Q3 An air-standard Diesel cycle that has a compression ratio (18: 1) receivesenergy at the rate of (1300kj/Kg) of air. At the beginning of the compression stroke,the temperature and pressure are (300K) and (100 KPa), respectively. Calculate(a) The net work out put per Kg of air. (b) The thermal efficiency of the cycle.(c) The expansion ratio.(d) The mean effective pressure.Answers: (a) 800.2 Kj/Kg (b) 61.5% (c) 7.63 (d) 984 KN/m²

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Answered: Q3 An air-standard Diesel cycle that…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1. Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60°C and 98 kPa. The engine has a compression ratio of 9.5:1 and uses gasoline with AF = 15.5. Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual. Heating value of the fuel is about 44MJ/kg. Calculate: (a) Temperature at all states in the cycle. [°C] (b) Pressure at all states in the cycle. [kpa] (c) Specific work done during power stroke. [kJ/kg] (d) Heat added during combustion. [kJ/kg] (e) Net specific work done. [kJ/kg] (f) Indicated thermal efficiency. [%]
In an air standard Diesel Cycle, the Compression ratio is 16 and at the beginning of isentropic Compression, the temperature is 15°C and the Pressure is 0.1 Mpa, heat is added until the temperature at the end of the constant pressure process is 1480°C. Calculate (a) the Cut-Off ratio, (b) the heat supplied per kg of air, (c) the Cycle efficiency.
Answer carefully please. Step by step solution. Determine: (a) the compression ratio. (b) the cutoff ratio. (c) the percent thermal efficiency of the cycle. (d) the mean effective pressure, in kPa.
i need the answer quickly
A 4 stroke spark ignition engine operates on an ideal Otto cycle with a compression ratio of 8.5. This engine compresses the fresh air-fuel mixture 20°C prior to the compression stroke. Temperature at the end of isentropic expansion is 750K. Make air standard assumption to solve this problem. Air from its initial volume to a final volume of 75cm. The air is at 101kPa and properties: Cp = 1.005KJ/kg.K; cy = 0.718KJ/kg.K; R = 0.287KJ/kg.K. (reter to the P-V diagram shown in first question.) Determine. • Temperature at the end of intake stroke (process 1 to 2) in Kelvins (T2). • Heat supplied (Qm )in KI (answer in 3DP) • Thermal efficiency of the Otto cycle (in %) Isentropic Isentropic BDC TDC
please use international values
An SI engine operates on an Otto cycle at 3800 RPM, with maximum cycle temperature andpressure of 3100 K and 7846 kPa. The engine has a compression ratio of 9.8:1, and immediately after combustion there is 0.000622 kg of exhaust gas in eachcylinder.During exhaustblowdown, the average mass flow rate through the single exhaust valve is 0.218 kg/sec. Atthe end of blowdown, cylinder pressure is reduced to exhaust pressure of 101 kPa.Calculate:(a) Temperature in cylinder at end of exhaust blowdown. [K](b) Mass of exhaust gas in cylinder at end of blowdown. [kg](c) Crank angle when exhaust valve opens. [° bBDC]
An ideal Brayton cycle has a pressure ratio of 8. At the beginning of the compression process, air is at 300 K. If Tmax in the cycle is 1200 K, determine the temperature of air, in K, at the beginning of heat exchange processes.determine the back-work ratio,determine the thermal efficiency of the cycle (Apply air-standard assumptions: variable specific heat)
At the beginning of the compression stroke an ideal otto cycle has an ideal pressure of 15 psia. A temperature of 75degF and specific volume of 13.2ft^3/lbm. At the end of compression, the specific volume is 1.76ft^3/lbm. The heat supplied to the cycle is 532BTU/lbm. For the cycle calculate. 1. Compression ratio2. The highest temperature of the cycle. (Rankine) 3. The highest pressure of the cycle. (psia) 4. The temperature at the end of the expansion of the air. (Rankine)5. The pressure at the end lf the expansion of thr air. (psia) 6. Heat rejected. (7. The net work of the cycle. 8. The thermal efficiency of the cycle. 9. The power developed by an ideal engine operating on this cycle using 0.5lb of air per second. (Horse Power)
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
In an air standard diesel cycle, compression starts at 100kPa and 300K. The compression ratio is 16 to 1. Themaximum cycle temperature is 2031K. Determine the thermalefficiency of the cycle?
A 4 stroke spark ignition engine operates on an ideal Otto cycle with a compression ratio of 8.5. This engine compresses the fresh air-fuel mixture from its initial volume to a final volume of 75cm. The air is at 101kPa and 20°C prior to the compression stroke. Temperature at the end of isentropic expansion is 750K. Make air standard assumption to solve this problem. Air properties: cp = 1.005KJ/kg.K; cy = 0.718KJ/kg.K; R = 0.287KJ/kg.K. Determine, • Mass of air in the engine (in kg). (answer to 4 decimals) (Hint: treat air as ideal gas at start of intake stroke - point 1 on P-V diagram) Isentropic Isentropic * Iout BDC TDC

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