In an Otto cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.54 L. If the displaced volume of the cycle is 0.48 L, the heat rejected is 410 kJ/kg, the temperature at the end of the expansion process is 868 K, the specific heat ratio is y=1.4, the specific heat at constant volume CV = 0.717 kJ/kg.K and the gas constant is 287 J/kg.K for air, the compression work in kJ per kg of air is: Select one: Oa. 299.1 O b. 405.2 O c. 124.5 d. 721.4

In an Otto cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.54 L. If the displaced volume of the cycle is 0.48 L, the heat rejected is 410 kJ/kg, the temperature at the end of the expansion process is 868 K, the specific heat ratio is y=1.4, the specific heat at constant volume CV = 0.717 kJ/kg.K and the gas constant is 287 J/kg.K for air, the compression work in kJ per kg of air is: Select one: Oa. 299.1 O b. 405.2 O c. 124.5 d. 721.4

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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An air standard cycle is executed in a closed system and composed of the following processes 1-2 Isentropic compression from 90 kPa and 77°C to 1 MPa 2-3 Pressure=constant heat addition in amount of 3500 kJ/kg 3-4 volume=constant heat rejection to 90 kPa 4-1 Pressure=constant heat rejection to initial state Calculate the maximum temperature in the cycle in kelvin and the cycle thermal efficiency?
In a Dual cycle, the volume at the beginning of the isentropic compression is 0.85 L and the pressure is 1 bar. If the swept volume of the cycle is 0.78 L, the pressure ratio during the constant volume heat addition process is 1.9, the volume ratio during the constant pressure heat addition process is 2.1, the specific heat ratio is y=1.3 and the work done is 455 kJ/kg, the total heat added in kJ per kg of air is: Select one: o a. 705.2 • b, 949,7 o c. 521.4 o d. 1124.5
PLEASE ANSWER ASAP >> thermodynamics
An air standard Otto cycle at the start of the isentropic compression has P₁ = 100 kPa and T₁ = 27°C. The compression ratio is 10 and during the heat addition process 1000 kJ/kg are supplied. Using the cold air standard analysis method, the net work for this cycle is most nearly equal to: A. 960 kJ/kg B. 900 kJ/kg C. 602 kJ/kg D. 333 kJ/kg E. Cannot be determined with the given information
PLEASE ANSWER ASAP
3. The p-v diagram of the cold-air-standard Atkinson cycle is shown. The cycle consists of isentropic compression, constant volume heat addition, isentropic expansion, and constant pressure compression. For a particular Atkinson cycle, the compression ratio during isentropic compression is 9.0. At the beginning of this compression process, p1 = 102 kPa and T1 = 305 K. The constant volume heat addition per unit mass of air is 1500 kJ/kg. (a) Sketch the cycle on T-s coordinates. Determine (b) the net work, in kJ per kg of air, (c) the thermal efficiency of the cycle, and (d) the mean effective pressure, in kPa.
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In a Dual cycle, the volume at the beginning of the isentropic compression is 0.85 L and the pressure is 1 bar. If the swept volume of the cycle is 0.78 L, the volume ratio during the constant pressure heat addition process is 2.1, the pressure ratio during the constant volume heat addition process is 1.9, the specific heat ratio is γ=1.3 and the work done is 455 kJ/kg, the heat rejected in kJ per kg of air is:
Thermodynamics
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.35. The compression ratio is 12 for the modified cycle. At the beginning of compression, p₁ = 1 bar and T₁ = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle. (b) the percent thermal efficiency. (c) the mean effective pressure, in bar.
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