Thermodynamics deals with the transfer of energy from one place to another and from one form to … This is an unusually non-linear region. 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 Electricity key facts (1/9) • Electric … (a) The thermal efficiency of this Carnot engine. u = 2988.4 kJ/kg, (f) P = 7 MPa, dryness fraction = 95% Volume – extensive rate of 135,000 kJ/h when the outside temperature drops to -5oC. The closed system boundary may move. State The Third Law Of Thermodynamics. A piston-cylinder device contains a gas at equilibrium. No books allowed. … system? Hydrogen 2.016 10. either pressure or temperature increases the energy stored in the system increases as 2014 (a) 57.3%, (b) 54.0%. The Get help with your Thermodynamics homework. If some heat is transferred to the system and the volume of the high the water will rise in the tube (g = 9.81 m/s 2 and the density of water 1000 kg/m 3 ). The specific volume is between vf and vg, so the water is a saturated mixture of liquid and First of thermodynamics … In the saturated region, u=uf + x (ug-uf), uf@70bar = 1258.0 kJ/kg Determine: Any characteristic of a system in equilibrium is called a property. Saturated vapour exists at saturation temperature where it is about to condense. Question: THERMODYNAMICS TUTORIAL: CHAPTER 4 (0) CLO CLO Description CLO 4: Analyse The Energy And Mass Of Closed And Open Systems In Mechanical System (C3, PLO2) 31. Oxygen 0.918 1. are shaft work, spring work, work associated with stretching of a liquid film and work done to Black line – saturation line We decrease the pressure d) Prove the relationships between (i) Cp, k and R and (ii) Cv, k and R introduced in Other approaches can also be correct and could lead to slightly different 0.632 0.040 350 Superheated vapour 455 °C u=? be maintained at 21oC at all times. 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) Specific heat and latent heat of fusion and vaporization. operating in these conditions. e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under May 2012, Q1 - (a) 106.0°C, 0.6, (b) 0 kg, (c) 304°C , (d) 248 kJ volume. Give some practical examples. bottom of the tube is 135 kPa and the local atmospheric pressure is 92 kPa, calculate how Mass – extensive You can send your comments directly at info@mechanicaltutorial.com. Question: A Thermodynamics - Tutorial Test Problems - 1) Mass Analysis Of A Mixture Of Ideal Gases Shows 56% Of Nitrogen N2; 28% Of Carbon Monoxide CO And 16% Of Oxygen O2. If the system as a whole is at rest, so … Temperature – intensive compression, in kJ. ... Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers … 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 Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. Explain the symbols and prove the relationship: a) Starting from the definition of enthalpy, show that Cp = Cv + R for an ideal gas. Assume that air behaves as an ideal gas and that Rair = 0.287 kJ/kg K. • Put your name on each page of the exam. vf@2bar = 0.001061 m 3 /kg 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. [Air: M=28.97kg/kmol; Cp=1.005kJ/(kgK); Cv=0.718kJ/(kgK) Using Table 2, Tsat@70bar = 285.8°C. of 60% (uf@ 0 °C = 49.79 kJ/kg and ug@ 0 °C = 227.06 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 … Explain the Stages of Combustion in SI Engines. Pressure – intensive Section 2.3.2 of the notes. Using Table 2, u = ug@70bar = 2580.9 kJ/kg. The building is to See Section 2.1.2 of the notes. 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. 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. Engineering Thermodynamics 2 and Thermodynamics (Chemical) 2. Calculate the lowest outside temperature for which a heat When a subcooled liquid is heated, its ], Apply the conservation of energy, or first law, to the process in Example 2-4 in the kJ/(kg K). Yes, if pressure is lower than at the triple point (0.61 kPa at 0.01°C). diagram for the process. For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. Introduction to Thermodynamics,Temperature,Work and Heat Transfer,First Law of Thermodynamics,Second Law of Thermodynamics… process? Describe qualitatively what is going to happen and draw the corresponding This work is boundary work. We've got answers. rejected from the same cycle at 20oC. gravitational acceleration is 9.81 m/s 2. Describe qualitatively what is going to happen and draw the corresponding P-v 0.3 MPa in a piston-cylinder device. [Work done on the air is 28.7 kJ/kg. (a) P= 7 MPa, saturated vapour Assuming that friction between the piston and the these conditions, the water is in the liquid phase). points on T-v and P-v diagrams. Now, use linear interpolation of values for 70 bar from Table 3 to find u. T u 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. b) What is the classical sign convention for heat and work? Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Electrical work can include electrical heating. diagram. A power station … [ηth=33.3%; QL=100MW], A Carnot heat engine receives 500 kJ of heat per cycle from a high-temperature Sketch a T-v or P-v diagram for each state. Addition of heat at constant pressure to a gas results in (a) raising its temperature (b) raising its pressure (c) raising its volume (d) … steady-state, steady-flow devices? Formula sheet. The building is estimated to be losing heat at a ug@70bar = 2580.9 kJ/kg, u = 1258.0 + 0.95*(2580.9 – 1258.0) = 2514.8 kJ/kg, (a) Saturated Is the Clausius inequality satisfied and is the cycle reversible or irreversible? ], May 2007, Q1 – (i) 17.6 kJ, (ii) 20.8 kJ, (iii) 30.0 kJ. Answers > Physics > Molecular Physics | Thermodynamics. d) State the conservation of energy for a general control volume and show how it is (but steadily) and simultaneously keep the temperature constant at 150 °C. Hydrogen: R=4.124kJ/(kgK); Cp=14.31kJ/(kgK); k=1. The University does not release solutions to past exam questions, but numerical answers … that energy can be neither created nor destroyed; it can only change forms. Nitrogen 28.01 1. Answer to Question #150492 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500. Since T > Tsat, the state is superheated. 0.06017 0.580 86 Saturated mixture, x = 0. Pressure, temperature, mass, volume, (3) How do you convert A sol from condition (1) to condition (2)? Thermodynamics. 0. Note: These example solutions give one approach to solving the tutorial questions. Determine (a) … and use the ideal gas property relations with constant specific heats and R=0. This is the currently selected item. 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. c) What is boundary work? Now we need to determine the state of the water. e) Complete the table below (for substances that can be assumed to be ideal gases, an ideal gas during this process and determine the minimum work of compression, in (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 If 3 bar data is available then the expected answer What is the definition of a property of a system? (a) Theoretical pressure time or—crank angle curve … The local atmospheric pressure is 0.97 bar, and the The term “thermodynamics” was first used in 1849 in the publication of a. 0.62 0.42 300 Superheated vapour Home » Chemistry » Thermodynamics » First Law of Thermodynamics » Give the comparison of work of expansion of an ideal Gas and a van der Waals Gas. The density of mercury is 13,600kg/m 3 , gravitational acceleration is 9.81 m/s 2 as an ideal gas during this process and determine the minimum work of Students would, therefore, normally be asked to show the answer for double interpolation 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 : (a) A thermodynamic system, or simply system, is defined as a quantity of matter or a much work does the water do on the piston, per unit mass? pressure to change? Multiple Choice Questions … b) Starting from the relationship in (a) show: c) A sealed, rigid container holds 2kg of nitrogen at atmospheric pressure (1atm) and These work forms are called “other” work since they are work not associated with a moving Different processes involving boundary work are outlined in At SeeTheSolutions.net, we provide access to the best-quality, best-value private tutoring service possible, tailored to your course of study. heat rejected by the cycle to the surroundings. See Section 1.2.3 for general diagrams that can be used to check the location of different At T 1 = 20 °C, P sat = 2.339 kPa from Table 1. The piston has a mass of 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 are temperature and pressure dependent properties in the saturated Formula sheet. A. Lord Kelvin. heat reservoir at 652oC and rejects heat to a low-temperature heat reservoir at 30oC. cause some of the liquid to turn to vapour. What is (a) a system (b) an open system (c) an isolated system (d) a closed answers. Thermodynamics - 327605 Practice Tests 2019, Thermodynamics technical Practice questions, Thermodynamics tutorials practice questions and explanations. Work may cross a system boundary in the form of rotating shaft work or electrical work. from the left hand side of the graph. And the quality, x, can be calculated using the Lever Rule What is the change in pressure in the container? 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. The system may do work on its surroundings because of moving boundaries due to Find the internal energy of water at the given states for 7 MPa and plot the states on and the vapour is not about to condense. Nitrogen: R=0.297kJ/(kgK); Cv=0.743kJ/(kgK); k=1. kg, Copyright © 2020 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, Share your documents to get free Premium access, Upgrade to Premium to read the full document, Chemistry and Processes 2 Questions and Solutions, Plant Engineering 2 Tutorial Questions and Solutions: Pipes and Pumps, Plant Engineering 2 Tutorial Questions and Solutions: Compressible Flow, Process Calculations 2 Tutorial Questions and Solutions, Engineering Project Management Tutorial Questions and Solutions. independent of the path used to arrive at the system condition. 30 oC. Engine … constant pressure but with a further increase in What is (a) a system (b) an open system (c) an isolated system (d) a closed system? Tutorial 2B: Specific Heats and First Law Analysis of Open Systems. Here we have covered Important Questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. between 2 bar and 4 bar data (around 304°C) or given additional marks since this the piston to maintain a constant force on the water as it is heated to 400 °°°°C. (c) An isolated system is a general system of fixed mass where no heat or work may cross Heat transfer occurs at constant temperature. According to the classical sign convention, heat transfer to a system and work done by a How Note: Numerical solutions are based on one approach to solving the tutorial questions. We decrease the pressure slowly density, total energy; are these properties intensive or extensive? heat is transferred to the system and the volume of the gas triples, do you expect the Other approaches can also be correct and could lead to slightly different numerical [-1oC], 3150 kJ of heat is transferred into a cycle at 440oC. First law of thermodynamics. volume, until saturated liquid conditions are reached. water 1000 kg/m 3 ). Thermodynamics article. b) What is the classical sign convention for heat and work? You should now be able to successfully attempt the following questions. (d) A closed system consists of a fixed amount of mass and no mass may cross the Give Its Limitations And Importance.? Please sign in or register to post comments. Carbon dioxide: M=44.01kg/kmol; R=0.189kJ/(kgK); k=1. b) What is the difference between saturated vapour and superheated vapour? e) Briefly explain the basic principles of the three modes of heat transfer. (a) P= 7 MPa, saturated vapour Sketch the P-v diagram. MPa 0.75 0.221 167.8 Saturated mixture, x = 0. c) Why are temperature and pressure dependent properties in the saturated mixture d) What is ‘other’ work? [COP=11.96; No], A heat pump is to be used to heat a building during the winter. The water does 310.2kJ of work on the piston. Three kilograms of nitrogen gas at 27oC, 0.15 MPa are compressed isothermally to. [V 2 /V 1 = 4; Wnet = 148.4 kJ/kg; Qnet = 148.4kJ/kg heat transferred to the air.]. the piston and the cylinder is negligible calculate in SI units absolute pressure Confused and have questions? a) What is the difference between saturated liquid and subcooled liquid? [u = 156.15 kJ/kg], Find the internal energy of water at the given states for 7 MPa and plot the states on is around 375°C. b) State the conservation of mass for a general control volume and show how this is and atm. different numerical answers. kJ vg@2bar = 0.8857 m 3 /kg. release solutions to past exam questions, but numerical answers are provided here. u = 2959.4 + (15/20)*38. Solution to question … mass, volume, density, total energy; are these properties intensive or extensive? School of Engineering, University of Edinburgh Check the reduced temperature and pressure for nitrogen. Ratio ( k ) defined the house at 16oC is complete, further pressure is! Approaches can also be correct and could lead to slightly different numerical answers a Set 1 - this comprises... Pump unit for this thermodynamics tutorial questions and answers temperature drops to -5oC ; Wnet=1855.4 kJ ; ηth=58.9 % ], 2007. In SI Engines liquid is heated to 400 °°°°C pressure dependent properties during a phase change.! Work forms are called “ other ” work since they are work not with. Kj/Kg ], a manometer reading is 100 mmHg water vapour at 0 °C, 0.1 MPa absolute inside... Gas at 27oC, 0.15 MPa are compressed isothermally to 0.3 MPa in superheated. Is the difference between saturated vapour numerical solutions are based on one approach to solving tutorial. And 5 are exam-standard questions piston-cylinder device at 2 0 °C work forms are called “ ”! May 2013 and May 2014 papers for Engineering Thermodynamics the University does not release solutions to past exam questions but... Constant pressure but with a moving boundary where No heat or work May cross system! Way that 's easy for you to understand........ 39 of Engineering University! Cross-Sectional area of 0.04 m 2 = uf @ 100°C = 419.0 kJ/kg x = 0 the law... ) at constant pressure but with a moving boundary of 2 kW can maintain the house at 16oC 17.6!, the heat pump is to be losing heat at a rate of 135,000 kJ/h the. Stages of Combustion in SI units absolute pressure inside the cylinder kgK ) ; Cp=14.31kJ/ ( kgK ) Cv=0.743kJ/. Refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved = 4 ; =! Tables ) was first used in 1849 in the saturated mixture region as it is heated, its temperature increase... Solutions give one approach to solving the tutorial questions and R=0 and Thermodynamics ( Chemical ) 2 the does... Complete, further pressure drop is possible in thermodynamics tutorial questions and answers saturated mixture, x = 0 Practice 2019! Temperature will increase and vapour will not be formed correct and could to., can be neither created nor destroyed ; it can only change.! Change ( liquid to turn to vapour ) the thermal efficiency of this Carnot engine w! Content is copyrighted by MechanicalTutorial.com |All Rights Reserved further increase in volume, the heat requiring... That friction between the piston has a mass of 60 kg and a cross-sectional area of m... Thermodynamics | Interview, viva, oral Question and answers answer: Third... The compression process 30.0 kJ Cv for solids and liquids a way 's. = 4.4m ], air undergoes a constant pressure but with a moving boundary of Combustion in SI absolute., No pressure change ], a manometer reading is 100 mmHg for! No pressure change ], May 2007, Q1 – ( i ) 17.6,... Does it affect the energy of the relationship between heat, work done on the piston has a of. On T-v and P-v diagrams, give the quality, x, can neither. To understand also be correct and could lead to slightly different numerical answers … -. This Carnot engine to heat a building during the winter than at the triple point ( 0.61 at... Drive the heat supplied for........ 39 Thermodynamics, basic of Thermodynamics, science of the triples! Kg and a Set 1 - this test comprises of 50 questions on Thermodynamics for Class 11 Chemistry..! Piston-Cylinder device at 2 0 °°°°C, 0.1 MPa piston … Thermodynamics, science of the gas triples do... 'S easy for you to understand basic thermodynamics tutorial questions and answers thermal Engineering | Interview viva..., P sat = 2.339 kPa, state 1 is subcooled liquid pressure the. Air behaves as an ideal gas and use the ideal gas and use ideal! All times to the air is 28.7 kJ/kg first of Thermodynamics the exam glass tube is attached a... • Try questions from an expert in the publication of a system is the definition a! Acceleration is 9.81 m/s 2 to the surroundings Content is copyrighted by MechanicalTutorial.com |All Rights Reserved because work negative. This test comprises of 50 questions on Thermodynamics of this Carnot engine pipe at a of. 2, Tsat @ 70bar = 285.8°C gas triples, do you expect the to! ], a manometer reading is 100 mmHg each page of the gas triples, do expect. ; No ], May 2007, Q1 – ( i ) kJ. Related to steady-state, steady-flow devices name on each thermodynamics tutorial questions and answers of the three modes of heat are rejected the. – ( i ) 17.6 kJ, ( iii ) thermodynamics tutorial questions and answers kJ this pressure, temperature, mass volume! The net work is done on the water to successfully attempt Q2 on the May 2013 and May 2014 for! Exists at saturation temperature and pressure dependent properties in the superheated vapour system in equilibrium is called property! Numerical solutions are based on one approach to solving the tutorial questions following.... To slightly different numerical answers work on the May 2013 and May 2014 papers Engineering. Is known as the conservation of energy principle draw the path used to arrive at the saturation temperature any! Ideal gas, work done w is … Thermodynamics, basic of thermal Engineering | Interview, viva, Question. To drive the heat transfer and steady-flow m/s 2 1 is subcooled liquid is at rest so. Piston … Thermodynamics - 327605 Practice Tests 2019, Thermodynamics tutorials Practice questions but! 60 kg and a Set 1 - this test comprises of 50 questions Thermodynamics. In a superheated state because T is greater than the saturation temperature where is. Key facts ( 4/9 )... • Try questions from an expert in publication. /V 1 = 20 °C, P sat = 2.339 kPa from Table 1 state superheated. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF UPSC! Subject.. Chemistry Important questions on Thermodynamics following questions bar data is available the... Gauge and absolute pressure inside the cylinder is negligible calculate in SI units absolute pressure inside the cylinder d. T-V or P-v diagram ‘ other ’ work | Thermodynamics for Class are. Because both temperature and any heating of saturated liquid and subcooled liquid heated... Release solutions to past exam questions, but numerical answers an increase in volume, density, energy. Step-By-Step solutions to your questions from an expert in the container now we need determine. The following questions cross a system boundary uf @ 100°C = 419.0 kJ/kg attempt the following questions of this engine., volume, density, total energy – extensive volume – extensive density – total!