Which of the following statements are true? A Carnot engine operating between low to high temperatures respectively is modified solely by raising the low temperature and high temperature by more than the initial values. * More work is done during Isentropic Compression More work is done during Reversible Adiabatic Expansion More work is done during Isothermal Expansion More work is done during Isothermal Compression The thermodynamic efficiency is increased The incoming air-fuel mixture cool valve during engine operation. TRUE OR FALSE? * Your answer Which of the following statements about the path of states 1 to 2 is/are true? * The path results in an expansion The path is reversible and adiabatic The path requires energy to be added to the process The path determines the amount of work done The path is indeterminate from these data

Which of the following statements are true? A Carnot engine operating between low to high temperatures respectively is modified solely by raising the low temperature and high temperature by more than the initial values. * More work is done during Isentropic Compression More work is done during Reversible Adiabatic Expansion More work is done during Isothermal Expansion More work is done during Isothermal Compression The thermodynamic efficiency is increased The incoming air-fuel mixture cool valve during engine operation. TRUE OR FALSE? * Your answer Which of the following statements about the path of states 1 to 2 is/are true? * The path results in an expansion The path is reversible and adiabatic The path requires energy to be added to the process The path determines the amount of work done The path is indeterminate from these data

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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Which of the following statements are true? A Carnot engine operating between low to high temperatures respectively is modified solely by raising the low temperature and high temperature by more than the initial values. * More work is done during Isothermal Compression More work is done during Isentropic Compression The thermodynamic efficiency is increased More work is done during Reversible Adiabatic Expansion More work is done during Isothermal Expansion It is a compression ignition engine of a two- or four-stroke type. From the p - V diagrams, it can be seen that the duration of the whole cycle is 360° CA for the two-stroke engine and 720° CA for the four-stroke engine. * Your answer Probably the most well-established and modeled compression and expansion process in the power chamber of an internal combustion engine is the Otto cycle. TRUE OR FALSE? * Your answer Carnot cycles are not encountered in reality since achieving isothermal heat transfer is very difficult (it needs huge…
Determine the temperatures and pressures at all stages of an ideal air-standard SI Otto cycle analysis
In a Diesel cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.85 L. The displaced volume of the cycle is 0.78 L, the temperature at the end of the compression process is 690 K, the pressure at the end of the expansion process is 2.32 bar, the specific heat ratio is =1.32, the specific heat at constant volume Cv = 0.75 kJ/kg.K and the gas constant is 287 J/kg.K for air. The compression ratio is: Choose. The specific heat at constant pressure in kJ/kg.K is: Choose. The maximum temperature of the cycle in K is: Choose. The temperature at the end of the expansion process of the cycle in K is: Choose.. the heat rejected in kJ/kg of air is: Choose.
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Air enters the compressor of a regenerative air-standard Brayton cycle with a volumetric flow rate of 60 m3/s at 0.8 bar, 280 K. The compressor pressure ratio is 20, and the maximum cycle temperature is 2100 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. The regenerator effectiveness of 85%. The pressure drops across a given stream in the regenerator and combustor can be neglected. Kinetic and potential energy changes are negligible. The outer walls of all components are thermally insulated. Use variable specific heat approach to indicate the air properties. a) Determine the rate of heat addition to the combustor, in MW b) Determine the thermal efficiency of the cycle c) Draw the processes in a T-s diagram
Draw and label the P-V and T-S diagrams. In an ideal Brayton cycle, air enters the compressor section at 14.7 psia and 55°F. The pressure ratio is 12. Turbine inlet condition of 1300°F. Determine the following:a. Pressure, specific volume & temperature at each stateb. Compression ratio
4Air enters the compressor of a simple gas turbine at p1 = 14 lbf/in2, T1 = 520°R. The isentropic efficiencies of the compressor and turbine are 83 and 87%, respectively. The compressor pressure ratio is 12 and the temperature at the turbine inlet is 2500°R. The volumetric flow rate of the air entering the compressor is 9000 ft3/min. Use an air-standard analysis. a) Determine the net power developed, in Btu/h. b) Determine the thermal efficiency of the cycle. c) The temperatures at the compressor and turbine exits in °R. d) The temperatures at the compressor and turbine enters in °R rmine the net power developed, in Btu/h .
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Temperature and pressure of air at the start of isentropic compression in a Dual Combustion Engine is 75°F & 15.1 psi. rk = 16, rp = 1.46. The peak cycle temperature is 2660R. Sketch the T-S Diagram
In an Otto cycle, the volume at the beginning of the isentropic compression is 0.8 L. If the displaced volume of the cycle is 0.72 L, the specific heat ratio is y=1.32 and the heat added is 872.7 kJ/kg, the work done in kJ per kg of air is: Select one: O a. 1024.5 O b. 455.0 O c. 705.2 O d. 521.4
In a Diesel cycle, the air at the beginning of the isentropic compression is at 1 bar and the volume is 0.85 L. The displaced volume of the cycle is 0.78 L, the temperature at the end of the compression process is 690 K, the pressure at the end of the expansion process is 2.32 bar, the specific heat ratio is =1.32, the specific heat at constant volume Cv = 0.75 kJ/kg.K and the gas constant is 287 J/kg.K for air. The compression ratio is: Choose... + The specific heat at constant pressure in kJ/kg.K is: Choose... 1305 1520 The maximum temperature of the cycle in K is: 0.99 720 The temperature at the end of the expansion process of the cycle in K is: 1772 12.14 the work done in kJ/kg of air is: 15.78 14.2 421.4 2021 0.85 302.0