Q1) One kg of air at a pressure of (1.5 bar ) is cooled at a constant volume to a pressure ( 1 bar ). It is then compressed adiabatically until it attains its initial temperature , when the pressure is found to be ( 5 bar ) . a) Draw the processes on (P-V ) diagram . b) State the type of expansion necessary to bring the air back to its Original pressure . c) If the initial temperature of the air is ( 190 °C ), determine the work done and heat transferred during the processes . [ Take, Cp = 1.0 kJ /kg .ºK , C = 0. 72 kJ / kg .ºK]

Q1) One kg of air at a pressure of (1.5 bar ) is cooled at a constant volume to a pressure ( 1 bar ). It is then compressed adiabatically until it attains its initial temperature , when the pressure is found to be ( 5 bar ) . a) Draw the processes on (P-V ) diagram . b) State the type of expansion necessary to bring the air back to its Original pressure . c) If the initial temperature of the air is ( 190 °C ), determine the work done and heat transferred during the processes . [ Take, Cp = 1.0 kJ /kg .ºK , C = 0. 72 kJ / kg .ºK]

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

Q1: (A) kg of air is compressed causing its temperature to increase from 25K° to 100K°. If the specific heat constant, Cp(T) in KJ/Kg.K°, is given as follows: Cp(T)= 0.917+14.32x10$T-51.29x10°T? Find the amount of internal energy and enthalpy gained during the compression process.
Compressor accepts ideal gas at 20 C and compresses it to 60 C. During compression stage it gives off heat in the amount of 10 kJ/kg. Determine work of the compressor? (specific heat values are c_p=2 kJ/(kg*K), c_v=1 kJ/(kg*K)) a) 40 kJ/kg b) 70 kJ/kg c) 30 kJ/kg d) 90 kJ/kg e) 50 kJ/kg
3. A 750 liter rigid tank (1 liter = 0.001 m³) initially contains water at 250 (°C), which is 50% liquid and 50% vapor by volume. A valve at the bottom of the tank is opened and liquid is slowly drawn. Heat transfer to the tank takes place such that the temperature at exit remains constant (250 (°C)). Find the amount of heat transfer required: i) where half of the original mass of liquid water is withdrawn ii) where half of original mass is withdrawn (both liquid and vapor)
E3.1. You must use the property data from the tables in the Appendix of your text to do this problem. The figure below illustrates a pressure cooker with the pressure relief valve removed. atm- 100 kPa V= 2 liter bottom 5% is filled with liquid water . The pressure cooker has an internal volume of V = 2 liters. Because the relief valve is removed, the contents are initially at atmospheric pressure, Patm = 100 kPa. The pressure cooker contains water in a two-phase state. The bottom 5% of the volume of the vessel is filled with liquid water while the remainder of the vessel contains water vapor. a) Determine the initial temperature of the water in the cooker. b) Determine the quality and specific volume of the water initially in the cooker. c) Sketch by hand a T-v diagram and label the initial state of the water (state 1).
Compressor accepts ideal gas at 25 C and compresses it to 75 C. During compression stage it gives off heat in the amount of 10 kJ/kg. Determine work of the compressor? (specific heat values are c_p=1 kJ/(kg*K), c_v=0.5 kJ/(kg*K)) A)15 kJ/kg B)70 kJ/kg C)60 kJ/kg D)35 kJ/kg E)50 kJ/kg
A Piston-Cylinder arrangement initially contains 3 kg of water as saturated liquid at 200 kPa pressure. Then, heat transfer to water, some of the water evaporates and the piston rises. When the volume is 60 liters, the piston touches the stoppers. Heating process continues until the pressure is twice the initial pressure. Plot the state change on the P-v diagram showing the saturation curves. Also, A) Finally, find the mass of the system in liquid phase. B) Find the final temperature. C) Calculate the total work done and heat transfer during the process.
Assignment #4 A closed container of water is at 700kPa. The mass of the saturated liquid is 1.78 kg, and the mass of the saturated vapor is 0.22 kg. Heat increases the pressure to 8 MPa. a) Find the final temperature, enthalpy and internal energy. b) Plot this process on a T-v diagram. (Ans: 362°C, 3024 kJ/kg, 2776 kJ/kg)
4. A cylinder contains 0.12 m³ of air at 1 atm and 90 °C. The air is compressed to a volume of 0.03 m³, The final pressure being 6 atm. Determine: a.) the value of n for the compression; b.) the increase in internal energy of air; and c.) the work done during compression.
Question: 2 kg mass of ammonia initially at P1=7 bars and T1=180 centigrade undergo a constant pressure process to a final state where quality is 85% determine the work for the process kilojoule Note: please do it clear and step wisely thanks in advanced........
By choosing one of the 3 options given below, the water in the closed container in Find the temperature and show the process on T-v, P-v diagrams. 1. 2. 3. Seçenek Seçenek Seçenek V n (devir/dakika) su 700 800 900 mil Tork (N.m) 150 200 250 Pi, T1, V1 t (dakika) 20 15 10 V (volt) 140 130 120 I (amper) 10 15 20 P. (kPa) 800 600 400 TI 150 130 120 VI (litre) 10 15 20 Q: (kJ) 400 500 600
A piston and cylinder assembly contains 2 kg of air at 27 ° C and 200 kPa.A linear spring, its mass and the atmosphere act on the piston.The stops are mounted so that V (stops) = 3 m ^ 3, at which point a pressure P = 600 kPa is required to balance the piston forces. The air is heated to 1,500 K.a) Determine the final pressure and volume.b) Calculate the work done in the process. see img
a) A nozzle is a device that is used to increase the velocity of a fluid by varying the cross-sectional area. At the last section of a jet engine (Fig Q1.a, section 5), air with a mass flow rate of 50 kg/s at a pressure of 500 kPa and a temperature of 600 K enters a nozzle with an inlet cross-sectional area of 5 m2. The exit area of the nozzle is 20% of its inlet area. The air leaves the nozzle at a velocity of 300 m/s. The nozzle is not well-insulated and during this process, 5 kJ/kg heat is lost.Figure Q1.a: Schematic of a Jet engine.(i) In analysing this nozzle using the 1st law of thermodynamics, the change in which type of energy is negligible? (ii) Determine the density and velocity of the air entering thenozzle.(iii) Calculate the density of the air as it leaves the nozzle.l(iv) Determine the temperature of the air as it leaves the nozzle. ((v) Calculate the pressure of the air as it leaves the nozzle Only solve V please