4. A petrol engine develops 50 kW brake power. The fuel and air flow rates are 10 kg and 107 kg/hr. Thetemperature of fuel air mixture entering the engine is 200C and temperature of gases leaving the engineis 5000C. The heat transfer rate from the engine to the cooling water circulated is 50kJ/s and that to thesurroundings 10 kJ/s. Evaluate the increase in the specific enthalpy of the mixture as it flows through theengine.

Answered: Image /qna-images/answer/6aaa4795-dfcb-4874-b48f-67c52f4979b0.jpg

Answered: 4. A petrol engine develops 50 kW brake…

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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How do i calculate the energy lost when fuel burns? For example in an engine
1. Combustion gases enter the nozzle of a jet engine at 3.8 bar and 820 oC. Thenozzle is well insulated and the gases expand down to an exit pressure of 1.1 bar.Determine the temperature and the velocity of the gases at exit from the nozzleassuming the velocity at inlet is negligible. For the combustion gases takecp = 1.15 KJ/Kg. K and the ratio of specific heats = 1.32
4) Hot combustion gases enter the nozzle of a turbojet engine at 350 kPa, 1007 °C and 95 m/s, and they exit at a pressure 100 kPa. Assuming an isentropic efficiency of 95 percent and treating the combustion gases as air determind a- The exit velocity b- The exit temperature
Q3→ Steam enters a steam turbine at a pressure of 4 MPa and a flow rate of 25 kg / s at 450 ° C. At a pressure of 1 MPa and a temperature of350 ° C, intermediate steam is drawn from the turbine at a flow rate of 5 kg /h. The remainder of the steam leaves the turbine at 10 kPa pressure and 0.90 dryness. 200 kW of heat loss occurs from the turbine to the environment. Ambient temperature is 25 ° C and pressure is 100 КРа. www a) Calculate the exergy (available work potentials) of the state points. b) Find the reversible amount of work and the actual amount of work during this process. c) Calculate the amount of irreversibility (exergy destruction) in this process. d) Calculate the second-law yield for this process.
13. 1.2 kg gas (R = 260 J/kg K, k = 1.395) in a Tank is stirred by a naddle until the pressure is doubled. The change in entropy is, Saved successfully C-0.568 a 0.531 b 0.547 d-0.547
1
Problem 10: A mass m of a material is heated reversibly from temperature T1 to T2 at a constant pressure of P. In this problem, we are going to determine an expression for the change in entropy, ΔS. Assume we can heat the given material infinitesimally slowly so that the process is reversible. Therefore, heat in any infinitesimal step is given by the following:dQ = mcpdT,where cp is the specific heat. In general, the heat capacity of a material can be temperature-dependent. A general temperature-dependent empirical form for the specific heat for ideal gases and incompressible liquids such as water is as follows:cp(T) = A + BT + CT 2 + DT -2,where A, B, C, and D are substance-dependent constants that can be determined empirically. Part (a) Determine the change in entropy, in calories per kelvin, for a sample of incompressible fluid with mass m = 2.3 kg and changing temperature from T1 = 18.8°C to T2 = (18.8+10)°C. The constant A = 993 cal/(kg K), B = 993 • 10-2 cal/(kg K2), C = D =…
ASEM 12/6/2015 Q1/ A stream of warm water is produced in a steady flow mixing process by combining 1.0 kg/s of cool water at 25 °C with 0.8 kg/s of hot water at 75 °C. During mixing, heat is lost to the surroundings at the rate of 30 kJ/s. What is the temperature of the warm water stream? Assume the specific heat of water constant at 4.18 kJ/kg.K.
Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg. The isentropic index is 1.2 and the air intake is at 1 bar, 200C & RH =65% v) The discharged air is passed through an R134a refrigerant dryer, the temperature of air coming out the dryer is 400C. The air then settles inside a reservoir at a temperature of 25 0C. Determine: The humidity variation throughout the production of compressed air The amount of condensate formed at each stage of the process by using The humidity definition
Please I request you to answer correctly without copying the answer from book as the question is different
16. A gas mixture contains hydrogen, nitrogen and carbon monoxide in equal molar proportions. Treating the components of the mixture as perfect gases, determine the gas constant and the ratio of specific heats for the mixture. Calculate the work required to compress 1 kg of the mixture in reversible adiabatic flow through a pressure ratio of 2 from an initial temperature of 15°C when kinetic and potential energy changes are negligible. [Ans. 0.43 kJ/kg K. 1.4, – 82.76 kJ]

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