Q2/ An ideal gas, Cp= (2) R and Cv=R, undergoes the following mechanically reversible changes in series of nonflow processes: (a) From initial state of 40°C and 150 kpa, it is compressed adiabatically to 600 kpa. (b) It is then cooled to 40°C at a constant pressure of 600 kpa. (c) Finally, the gas is expanded isothermally to it is origin state. Calculate Q, W,Au and AH for each of the three processes and for the cycle. Repeat these calculations for exactly the same changes of state accomplished irreversibly with an efficiency for each process of 80 percent compacted with the corresponding mechanically reversible process.

Q2/ An ideal gas, Cp= (2) R and Cv=R, undergoes the following mechanically reversible changes in series of nonflow processes: (a) From initial state of 40°C and 150 kpa, it is compressed adiabatically to 600 kpa. (b) It is then cooled to 40°C at a constant pressure of 600 kpa. (c) Finally, the gas is expanded isothermally to it is origin state. Calculate Q, W,Au and AH for each of the three processes and for the cycle. Repeat these calculations for exactly the same changes of state accomplished irreversibly with an efficiency for each process of 80 percent compacted with the corresponding mechanically reversible process.

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

See similar textbooks

Similar questions

A monatomic ideal gas is compressed isothermally from a volume of 2.0m^3 to 1.0 m^3. The initial pressure is 20 kPa. a. Find the work done on the gas from initial state to final state. b. Find the change in the internal energy of the gas. c. Find the amount of heat exchanged.
For a certain ideal gas, R=032 KJ/kgm-K and Cp=1160 J/kgm-K. (a) Find Cv and K. (b) If 6 kgm of this gas undergo a reversible nonflows constant pressure process from V1=2.1 cu.m, p1=0.7MPaa to a state where T2=830 K, find delta H, delta U, and Q and W.
Q4: A. An ideal gas initially at 30°C undergoes an isobaric expansion at 3kpa. If the volume increases from 1.5 to 3.5 m³ and 13 kJ is transferred to the gas by heat, what are (a) the change in its internal energy and (b) its final temperature? B. Calculate the work necessary to compress air in an insulated cylinder from a volume of 0.1699 m³ to a volume of 0.03398 m³.The initial temperature and pressure are 10°C and 206.842 kpa, respectively. The specific heat ratio k=1.4
1 PROBLEM 3.0 Two and a half kg of an ideal gas with R = 296.9 J/(kg) (K) and c, = 0.7442 kJ/(kg)(K) at a pressure of 827.4 kPa and a temperature of 667°C reject 132.2 kJ of heat at a constant pressure. The gas is then expanded according to pV1 25 = C to a point where a constant volume process will bring the gas back to its original state. Determine The heat added in KW The power in kW for 100 Hz.,
(b) At initial state (state-1), a tank contains water vapor at 250°C with an unknown pressure. When the tank is cooled isochorically to 150°C at second state (state-2), the vapor starts condensing. Since the tank is not insulated, further heat loss occurred isobarically until all the water vapor in the tank turns to liquid at final state (state-3). (iv) Estimate the pressure, specific volume, and the enthalpy at its initial state; (v) Determine the pressure, specific volume, and enthalpy at state-3; and (vi) Sketch the process from initial to final state on a T-v diagram complete with the saturation line. Plot the point and pressure curve for each state, and show their axis values on the diagram. Describe the phases of each state in the calculations. Note: Show all steps and calculations involved.
One kilogram on a diatomic ideal gas undergoes the following four step process starting at Point A (100 kPa, 300K, 5 m³) A => B Isothermal compression to 1 m³. B=> C Isobaric expansion to 900K. C=> D Adiabatic expansion to the original volume of 5 m³. D=> Alsochoric process to the original pressure of 100 kPa. ● ● ● (a) Determine P, V, and T, for points A, B, C & D. (b) What is AU, Q, W, AH & AS for each process of the cycle? (c) What is the efficiency of this cycle? d) Sketch a P-V diagram and T-S diagram, indicating P, V, T, for all points & AU, Q, W, AH & AS for each leg. Repeat problem one for a monoatomic ideal gas. Compare the Thermal Efficiency of a monoatomic ideal gas to the Thermal Efficiency of a diatomic ideaf gas for this same cycle
Q4: A. An ideal gas initially at 30°C undergoes an isobaric expansion at 3kpa. If the volume increases from 1.5 to 3.5 m3 and 13 kJ is transferred to the gas by heat, what are (a) the change in its internal energy and (b) its final temperature?
0.05 m3 of perfect gas at 6.3 bar undergoes a reversible isothermal processto a pressure of 1.05 bar, Calculate the heat flow to or from the system. (56.4kJ)
One kilogram on a monoatomic ideal gas undergoes the following four step process starting at Point A (100 kPa, 300K, 4 m^3) • A =>B Isothermal compression that quarters the volume (to 1 m^3) •B => C Isobaric expansion that triples the temperature (to 900K) •C=> D Adiabatic expansion to the original volume (to 4 m^3). •D=> A Isochoric process to the original pressure (to 100 kPa). (a) Determine P, V, and T, for all points. (b) What is AU, Q, W, AH & AS for each leg of the cycle? (c) What is the efficiency of this cycle? (d) Sketch a P-V diagram and T-S diagram, indicating P, V, T, for all points & AU, Q, W, AH & AS for each leg.
Q17 An ideal gas (Cp = R and C₁ = R), undergoes the following mechanically reversible changes in series of nonflow processes: a) From initial state of 20 °C and 130 kPa, it is compressed adiabatically to 500 kPa. b) It is then cooled to 20 °C at a constant pressure of 500 kPa c) Finally, the gas is expanded isothermally to its original state. Calculate the Q,W, AU and AH for each of three processes and for the cycle.
One-quarter Ibmol of oxygen gas (O2) undergoes a process from p1 = 20 lb/in?, T1 = 500°R to p2 = 150 lb;/in?. For the process W = -500 Btu and Q = -202.5 Btu. Assume the oxygen behaves as an ideal gas. Determine T2, in °R, and the change in entropy, in Btu/°R.
A quantity of gas (mean molecular weight 36.2) is compressed according to the law pvn = constant, theinitial pressure and volume being 1.03 bar and 0.98 m3 respectively. The temperature at the start of compression is 17°C and at the end it is 115°C. The amount of heat rejected during compression is 3.78 kJ,cp= 0.92. Calculate :(i) Value of n, (ii) Final pressure, (iii) Change in entropy.