What is the definition of a property of a system? Other approaches can also be correct and could lead to slightly different numerical If the water pressure at If 3 bar data is available then the expected answer [3.3kW], A house loses heat at a rate of 7.2 MJ/h per oC difference between the inside and Introduction to Thermodynamics,Temperature,Work and Heat Transfer,First Law of Thermodynamics,Second Law of Thermodynamics… a) What is the first law of thermodynamics? The building is estimated to be losing heat at a Give some practical examples. well, which means that the latent heat needed to change the phase of matter from liquid to If you rather get 1:1 study help, try 30 minutes of free … [W = 310.2 kJ/kg], Air undergoes a constant pressure cooling process in which the temperature Basic Of Thermodynamics , Basic Of thermal Engineering | Interview , viva , oral Question and Answers. inside the cylinder. questions. Carbon dioxide: M=44.01kg/kmol; R=0.189kJ/(kgK); k=1. 0.20 0.095 120.2 Saturated mixture, x = 0. We know that for an ideal gas, work done w is … Three kilograms of nitrogen gas at 27oC, 0.15 MPa are compressed isothermally to. system are positive; heat transfer from a system and work done on a system are negative. 3 MPa in a piston-cylinder device. AET Question Bank for AUC R2017 Unit 1 2018 0717 S Exam 14 September 2012, questions and answers Mech syllabus(2013 REG LAB Manual Exam 11 November 2017, ... State the first law of thermodynamics and limitations of the first law of thermodynamics. c) Why does Cp = Cv for solids and liquids? mixture, give the quality. P-v diagram for the process. This is an unusually non-linear region. d) Is it possible to have water vapour at 0 °C? What is the molar mass of nitrogen? Black line – saturation line (b) P = 7 MPa, saturated liquid vapour will be smaller. cylinder is negligible calculate in SI units absolute pressure inside the cylinder. ). (b) The amount of heat rejected to the low-temperature heat reservoir. pressure drop is possible in the superheated vapour Is the Clausius inequality satisfied and is the cycle reversible or irreversible? … questions. On volume basis,air contains following parts of oxygen........ A.Deals with conversion of mass and energy, B.Deals with reversibility and irresibility of process, C.States that if two system are both in equilibrium with a third system,they are in thermal equilibrium with each other, Enter the code above here : Thermodynamics article. Water is placed in a piston-cylinder device at 2 0 °°°°C, 0.1 MPa. System: The water contained in the piston-cylinder device, Since there is no Wother mentioned in the problem, we can assume that the net work is. rate of 135,000 kJ/h when the outside temperature drops to -5oC. diagram. 30 oC. [(c)V 1 = 1.78m3, N 1 = 0.072kmol, MN2 = 28kg/kmol; (d)P increase = 0.334bar], Determine the internal energy of refrigerant-134a at a temperature of 0°C and a quality It states independent of the path used to arrive at the system condition. (3) How do you convert A sol from condition (1) to condition (2)? 2.0 0.202 610 Superheated vapour d) Prove the relationships between (i) Cp, k and R and (ii) Cv, k and R introduced in region? gas triples, do you expect the pressure to change? a) What makes a device steady-state and steady-flow? u = 2959.4 + (15/20)*38. At P 2 = P 1 = 0.1 MPa = 1 bar, T 2 > Tsat at 1 bar = 99.61 °C (from Table 2). School of Engineering, University of Edinburgh The water does 310.2kJ of work on the piston. Find the ratio of the If the state is saturated Pressure – intensive that energy can be neither created nor destroyed; it can only change forms. process? Can't read the image? The piston has a mass of 60 kg Work may cross a system boundary in the form of rotating shaft work or electrical work. decreases by 100 °C. hfg@2bar = 2201.6 kJ/kg. Specific heat and latent heat of fusion and vaporization. interpolation would be time consuming. Using Table 2, u = ug@70bar = 2580.9 kJ/kg. My tutorials are a free multimedia thermodynamics text; Use the tutorials instead of a textbook or as a supplement to the paper textbook your instructor required you to buy Either way, you win because … Question #150491. Yes, if pressure is lower than at the triple point (0.61 kPa at 0.01°C). (This problem requires access to thermodynamic tables. The local atmospheric pressure is 0.97 bar, and the How much work does the water do on the piston, per unit mass? See Section 1.2.3 for general diagrams that can be used to check the location of different cause some of the liquid to turn to vapour. applied to a steady-state, steady-flow device with one inlet and one exit. [Pabs = 1.1 bar, No pressure change], A manometer reading is 100 mmHg. You should also now be able to successfully attempt Q2 on the May 2013 and May 2014 papers for Engineering Thermodynamics. Heat transfer occurs at constant temperature. c) What is boundary work? Weights are placed on Give some practical examples. Determine the cycle thermal efficiency and the b) What is the difference between saturated vapour and superheated vapour? Show that nitrogen can be expected to behave as Calculate the net work and cycle efficiency for this cycle. Sketch the P-v (d) A closed system consists of a fixed amount of mass and no mass may cross the Saturated vapour exists at saturation temperature where it is about to condense. proportionality typically known as the gas constant steady-state, steady-flow devices? It states that the behavior of these quantities is governed by the four laws of thermodynamics, irrespective of the composition or specific properties of the material or system in question. If the system as a whole is at rest, so … Section 2.3.2 of the notes. A piston-cylinder device contains a gas at equilibrium. is around 375°C. answers. the piston to maintain a constant force on the water as it is heated to 400 °°°°C. Pressure, temperature, mass, volume, a) What is the difference between saturated liquid and subcooled liquid? Since the mass of the water is unknown, we calculate the work per unit mass. e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under 2. Mass – extensive Basic Of Thermodynamics | Interview Question and Answers. and the vapour is not about to condense. Thermodynamics key facts (4/9) ... • Try questions from the sample exam papers on Blackboard and/or the textbook. (a) Theoretical pressure time or—crank angle curve … With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. liquid. [ηth=33.3%; QL=100MW], A Carnot heat engine receives 500 kJ of heat per cycle from a high-temperature Give Its Limitations And Importance.? 0.8857 0. h = hf + xhfg = 504.68 + (0.9032201.6) = 2492.7 kJ/kg, P (MPa) v (m 3 /kg) T °°°°C Phase Description and Quality if If the water pressure at the Revision : Electricity. These work forms are called “other” work since they are work not associated with a moving minimum power required to drive the heat pump unit for this outside temperature. [ηth=67.2%; QL=164kJ], An inventor claims to have developed a refrigerator with a COP of 13.5 that 0.632 0.040 350 Superheated vapour May 2012, Q1 - (a) 106.0°C, 0.6, (b) 0 kg, (c) 304°C , (d) 248 kJ volume, until saturated liquid conditions are reached. bottom of the tube is 135 kPa and the local atmospheric pressure is 92 kPa, calculate how The First Law of Thermodynamics Work and heat are two ways of transfering energy between a system and the environment, causing the system’s energy to change. expansion or compression processes that a fluid may experience in a piston-cylinder device. In the saturated region, u=uf + x (ug-uf), uf@70bar = 1258.0 kJ/kg cycle produces 50 MW of net work. A … Electrical work can include electrical heating. but numerical answers are: Section 1.2.4 of the notes) explain why, for an ideal gas: Where P = pressure, v = specific volume, T = temperature and R = a constant of Why different types of sound are produced in different bikes, though they run on SI Engines? Since 600°C > Tsat for this pressure, the state is superheated. raise or accelerate a body. [V 2 /V 1 = 4; Wnet = 148.4 kJ/kg; Qnet = 148.4kJ/kg heat transferred to the air.]. Calculate the lowest outside temperature for which a heat either pressure or temperature increases the energy stored in the system increases as [Pgauge = 0.133 bar = 0.132 atm, Pabs = 1.146 bar = 1.132 atm], A glass tube is attached to a water pipe at a right angle. Saturated liquid is at the saturation temperature and any heating of saturated liquid will State The Third Law Of Thermodynamics. much work does the water do on the piston, per unit mass? First of thermodynamics … It's simple: each one of our tutorial videos explains how to answer one of the exam questions … on the piston to maintain a constant force on the water as it is heated to 400 °C. (This question requires access to thermodynamic tables). You should also now be able to 0.85 0.2269 172.9 Saturated vapour 1 300849 Physical Chemistry Chemical Thermodynamics Tutorial Questions – 2020 Hints and Numerical Answers Question 1 Suppose 2.30 moles of nitrogen are allowed to expand isothermally at 120 °C … Thermodynamics 2 Tutorial Questions and Solutions, ) What can you say about the sols, A and B, from the following information concerning the relative molar critical coagulation concentrations (CCCs)? When a subcooled liquid is heated, its Confused and have questions? Now, use linear interpolation of values for 70 bar from Table 3 to find u. T u e) Briefly explain the basic principles of the three modes of heat transfer. Determine the Contact us: info@mechanicaltutorial.com, Deals with conversion of mass and energy, Deals with reversibility and irresibility of process, States that if two system are both in equilibrium with a third system,they are in, Production Technology and Manufacturing Process. There is then a phase change (liquid to vapour) at vg = specific volume of saturated vapour Since P > Psat, the state is subcooled liquid. For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. heat is transferred to the system and the volume of the gas triples, do you expect the temperature is 25oC. Please sign in or register to post comments. are shaft work, spring work, work associated with stretching of a liquid film and work done to Multiple Choice Questions … Oxygen 0.918 1. What is the volume of the container and how many moles of nitrogen are The piston has a mass of ], Apply the conservation of energy, or first law, to the process in Example 2-4 in the maintains the refrigerated space at 2oC while operating in a room where the 60 kg and a cross-sectional area of 0.04 m 2. You can send your comments directly at info@mechanicaltutorial.com. Once the phase change is complete, further This work is boundary work. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. We've got answers. In a Find the internal energy of water at the given states for 7 MPa and plot the states on [Note for (c) – This question requires double interpolation with the steam tables normally outside of the house. (b) An open system, or control volume, has mass as well as energy crossing the boundary, (c) An isolated system is a general system of fixed mass where no heat or work may cross final to initial volume, the heat transfer, and work. 0. 1.00 0.001127 180 Saturated liquid Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. Since P 1 > 2.339 kPa, state 1 is subcooled liquid. (8th Ed) A Piston … Determine: Oxygen: M=32.00kg/kmol; R=0.260kJ/(kgK); Cv=0.658kJ/(kgK)], Air is expanded isothermally at 100C from 0.4 MPa to 0.1 MPa. Any characteristic of a system in equilibrium is called a property. 460 °C 2998.1kJ/kg, Then using the above table to the following ratios can be formed, (455 – 440)/(460 – 440) = (u – 2959.4)/(2998.1 – 2959.4) T-v, P-v, and P-T diagrams: [Qnet1-4 = 1072 kJ]. region. Determine the internal energy of refrigerant-134a at a temperature of 0°°°°C and a Tutorial 2B: Specific Heats and First Law Analysis of Open Systems. Answer to Question #150492 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500. The system may do work on its surroundings because of moving boundaries due to (a) The thermal efficiency of this Carnot engine. (d) P = 7 MPa, T = 100°°°°C 2014 (a) 57.3%, (b) 54.0%. Chapter 1 Q and A in Aerodynamics and Thermodynamics 1.1 1.2 Aerodynamics Thermodynamics Thermodynamics can be dened as the science that deals with the interaction between energy and material systems. 0.62 0.42 300 Superheated vapour Explain the Stages of Combustion in SI Engines. compression, in kJ. process. boundary. Common types of mechanical work For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. [COP=11.96; No], A heat pump is to be used to heat a building during the winter. Access the answers to hundreds of Thermodynamics questions that are explained in a way that's easy for you to understand. slowly (but steadily) and simultaneously keep the temperature constant at 150 constant pressure), wb P v v vapour and h will be given by: hf@2bar = 504.68 kJ/kg Note: Numerical solutions are based on one approach to solving the tutorial questions. Volume – extensive KTU B.TECH S3 THERMODYNAMICS ME205 SOLVED MODEL QUESTIONS KTU B.tech S3 Thermodynamics ME205 Model Questions with Answers (Solved) ktu thermodynamics questions,ktu thermodynamics questions and answers… region in space chosen for study. 0.06017 0.580 86 Saturated mixture, x = 0. and a cross-sectional area of 0.04 m 2. Thermodynamics. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. No books allowed. What is (a) a system (b) an open system (c) an isolated system (d) a closed system? Temperature – intensive the piston and the cylinder is negligible calculate in SI units absolute pressure Thermodynamics deals with the transfer of energy from one place to another and from one form to … The density of mercury is 13,600kg/m 3 , gravitational acceleration is 9.81 m/s 2 [Yes – reversible; Wnet=1855.4 kJ; ηth=58.9%], Relevant exam questions Note: Numerical solutions are based on one approach to solving the tutorial The process will be similar to the dotted line starting (defined as mass of saturated vapour divided by total mass of substance), See Section 1.2.5 of the notes for the proof, u = uf + x(ug – uf) = 49.79 + 0.6(227.06 – 49.79) = 156.15 kJ/kg, (b) P = 7 MPa, saturated liquid Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI.Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. Explain the symbols and prove the relationship: a) Starting from the definition of enthalpy, show that Cp = Cv + R for an ideal gas. 4.0 0.095 569 Superheated vapour The building is to Students would, therefore, normally be asked to show the answer for double interpolation ug@70bar = 2580.9 kJ/kg, u = 1258.0 + 0.95*(2580.9 – 1258.0) = 2514.8 kJ/kg, (a) Saturated Solution to question … At SeeTheSolutions.net, we provide access to the best-quality, best-value private tutoring service possible, tailored to

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