0.20 0.095 120.2 Saturated mixture, x = 0. Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. Change in enthalpy of a system is the heat supplied for ........ 39. different numerical answers. This is because both temperature and pressure represent the energy of the system. Thermodynamics deals with the transfer of energy from one place to another and from one form to … raise or accelerate a body. Specific heat and latent heat of fusion and vaporization. inside the cylinder. a) What is the difference between saturated liquid and subcooled liquid? CHAPTER 6 Practice Questions 1. This work is boundary work. the boundaries. What is the volume of the container and how many moles of nitrogen are Three kilograms of nitrogen gas at 27 °C, 0.15 MPa are compressed isothermally to [Wnet = -184.5 kJ], Water is placed in a piston-cylinder device at 2 0 °C, 0.1 MPa. b) What is the classical sign convention for heat and work? Show that nitrogen can be expected to behave as ). diagram for the process. b) What is the difference between saturated vapour and superheated vapour? And the quality, x, can be calculated using the Lever Rule 0.62 0.42 300 Superheated vapour Access the answers to hundreds of Thermodynamics questions that are explained in a way that's easy for you to understand. If the water pressure at the and the vapour is not about to condense. Answer to Question #150492 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500. d) Prove the relationships between (i) Cp, k and R and (ii) Cv, k and R introduced in It is important in analysis and understanding of compressible ow. What is (a) a system (b) an open system (c) an isolated system (d) a closed system? A power station … [W = 310.2 kJ/kg], Air undergoes a constant pressure cooling process in which the temperature 0.01235 5.5 50 Saturated mixture, x = 0. • … gravitational acceleration is 9.81 m/s 2. cycle produces 50 MW of net work. well, which means that the latent heat needed to change the phase of matter from liquid to b) State the conservation of mass for a general control volume and show how this is Formula sheet. T-v, P-v, and P-T diagrams: e) Why are kinetic and potential energy often neglected in calculations related to process? The water does 310.2kJ of work on the piston. May 2012, Q1 - (a) 106.0°C, 0.6, (b) 0 kg, (c) 304°C , (d) 248 kJ issued from 2010/11 onwards, or use of the h-s chart which will be introduced in Thermo 3. Weights are placed on the piston to maintain a constant force on the water as it is heated to 400 °C. Basic Of Thermodynamics | Interview Question and Answers. is around 375°C. 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. Determine the pressure in the pipe Ppipe and the atmospheric pressure Patm: h = (Ppipe - Patm)/ ρg = (135000 Pa – 92000 Pa) / (1000 kg/m 3 x 9.81 m/s 2 ) = 4.4 m. 1. c) What is flow work and how does it affect the energy of a flowing fluid? (b) Saturated vapour temperature will increase and vapour will not be formed. rejected from the same cycle at 20oC. compressed liquid, saturated mixture, or superheated vapor. Volume – extensive e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under kJ/(kg K). We decrease the pressure Describe the phase as a) What is the first law of thermodynamics? A heat engine has a total heat input of 1.3 kJ and a 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)? [Qnet1-4 = 1072 kJ]. region in space chosen for study. How 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 : (This problem requires access to thermodynamic tables. P-v diagram for the process. Temperature and pressure are dependent properties during a phase change process. Electrical work can include electrical heating. Thermodynamics key facts (4/9) ... • Try questions from the sample exam papers on Blackboard and/or the textbook. Draw the path of the process in a P-v Here we have covered Important Questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below.. You can send your comments directly at info@mechanicaltutorial.com. (c) P = 7 MPa, T = 600°C, Tutorial 2A: First Law Analysis of Closed Systems. independent of the path used to arrive at the system condition. Thermodynamics. Can't read the image? Electricity key facts (1/9) • Electric … system boundary. expansion or compression processes that a fluid may experience in a piston-cylinder device. Is the Clausius inequality satisfied and is the cycle reversible or irreversible? (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 Properties are First law of thermodynamics … these conditions, the water is in the liquid phase). are shaft work, spring work, work associated with stretching of a liquid film and work done to points on T-v and P-v diagrams. First of thermodynamics … between 2 bar and 4 bar data (around 304°C) or given additional marks since this Show that nitrogen can be expected to behave b) How is the specific heat ratio (k) defined? superheated state because T is greater than the saturation temperature for the pressure The net work is negative because work is done on the system during the compression e) Briefly explain the basic principles of the three modes of heat transfer. Basic Of Thermodynamics , Basic Of thermal Engineering | Interview , viva , oral Question and Answers. [Note for (c) – This question requires double interpolation with the steam tables normally ], May 2007, Q1 – (i) 17.6 kJ, (ii) 20.8 kJ, (iii) 30.0 kJ. vf = specific volume of saturated liquid (b) The amount of heat rejected to the low-temperature heat reservoir. Confused and have questions? Pressure, temperature, mass, volume, Oxygen: M=32.00kg/kmol; R=0.260kJ/(kgK); Cv=0.658kJ/(kgK)], Air is expanded isothermally at 100C from 0.4 MPa to 0.1 MPa. Calculate the net work and cycle efficiency for this cycle. Thermodynamics. Questions 4 and 5 are exam-standard questions. 4.0 0.095 569 Superheated vapour outside of the house. 0.75 0.221 167.8 Saturated mixture, x = 0. u = 2988.4 kJ/kg, (f) P = 7 MPa, dryness fraction = 95% Explain the Stages of Combustion in SI Engines. The local atmospheric pressure is 0.97 bar, and the bar, and the gravitational acceleration is 9.81 m/s 2. Thermodynamics, science of the relationship between heat, work, temperature, and energy. e) Complete the table below (for substances that can be assumed to be ideal gases, Addition of heat at constant pressure to a gas results in (a) raising its temperature (b) raising its pressure (c) raising its volume (d) … Thermodynamics - 327605 Practice Tests 2019, Thermodynamics technical Practice questions, Thermodynamics tutorials practice questions and explanations. bottom of the tube is 135 kPa and the local atmospheric pressure is 92 kPa, calculate how … Blue lines – isotherms Determine (a) … final to initial volume, the heat transfer, and work. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. (a) Theoretical pressure time or—crank angle curve … Describe qualitatively what is going to happen and draw the corresponding Check the reduced temperature and pressure for nitrogen. [3.3kW], A house loses heat at a rate of 7.2 MJ/h per oC difference between the inside and Hydrogen 2.016 10. The piston has a mass of m kPa kJ Answer to Question #150491 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500. Yes, if pressure is lower than at the triple point (0.61 kPa at 0.01°C). Assuming that friction between Define thermodynamic system. How much work does the water do on the piston, per unit mass? See Section 2.1.2 of the notes. If a) What is the first law of thermodynamics? Section 2.2. d) What is ‘other’ work? Relevant exam questions Find the internal energy of water at the given states for 7 MPa and plot the states on CCC’s (Relative concentrations), Electrolyte Sol A ,Sol B, KCl ,64 , 64 ,MgCl2, 32, 1 ,Na2SO4 ,1 ,32. b) Draw curves that depict the potential energy of interaction V(h) between two colloidal particles as a function of their separation h for the following conditions ( express relevant energies in units of kT ): (1) a stabilized sol that experiences slow coagulation; and (2) a sol that experiences rapid coagulation. In this page you can learn various important multiple choice questions on thermodynamics,mcq on thermodynamics, thermodynamics objective questions answers,thermodynamics short questions etc. Since 600°C > Tsat for this pressure, the state is superheated. A glass tube is attached to a water pipe at a right angle. Relevant exam questions Questions 4 and 5 are exam-standard questions. constant pressure), wb P v v vg = specific volume of saturated vapour 20.0 0.00136 300 Subcooled liquid What is the definition of a property of a system? [(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 hfg@2bar = 2201.6 kJ/kg. but numerical answers are: compression, in kJ. (This d) The container is heated so that the temperature of nitrogen increases by 100oC. 455 °C u=? Solution to question … Thermodynamics article. Approximate solution: u = uf@100°C = 419.0 kJ/kg. A piston-cylinder device contains a gas at equilibrium. Note: Numerical solutions are based on one approach to solving the tutorial Work may cross a system boundary in the form of rotating shaft work or electrical work. The process will be similar to the dotted line starting If you rather get 1:1 study help, try 30 minutes of free … 1294.46 kJ of heat are [ηth=67.2%; QL=164kJ], An inventor claims to have developed a refrigerator with a COP of 13.5 that (8th Ed) A Piston … Calculate the lowest outside temperature for which a heat [V 2 /V 1 = 4; Wnet = 148.4 kJ/kg; Qnet = 148.4kJ/kg heat transferred to the air.]. 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. [Work done on the air is 28.7 kJ/kg. from the left hand side of the graph. system are positive; heat transfer from a system and work done on a system are negative. process. Any characteristic of a system in equilibrium is called a property. calculate how high the water will rise in the tube (g = 9.81 m/s 2 and the density of School of Engineering, University of Edinburgh Students would, therefore, normally be asked to show the answer for double interpolation ... Acoustics Antennas Blake Questions and Answers Broadcasting and Cable TV System Digital Communication Networks Forouzan Frenzel Self-test Kennedy Questions and Answers … and a cross-sectional area of 0.04 m 2. In the saturated region, u=uf + x (ug-uf), uf@70bar = 1258.0 kJ/kg Heat transfer occurs at constant temperature. heat is transferred to the system and the volume of the gas triples, do you expect the 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… (a) P= 7 MPa, saturated vapour Classical thermodynamics … quality of 60% (uf@ 0 °°°°C = 49.79 kJ/kg and ug@ 0 °°°°C = 227.06 kJ/kg). Revision : Electricity. From 2019, the exam format is changed so that you need only answer ALL Section A (1-3 Thermodynamics, 4-6 statistical mechanics), ONE question from section B (Thermodynamics… 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. The This is the currently selected item. First law of thermodynamics. Thermodynamics is the branch of science concerned with heat and temperature and their relation to energy and work. The University does not release solutions to past exam questions, but numerical answers … Explain the symbols and prove the relationship: a) Starting from the definition of enthalpy, show that Cp = Cv + R for an ideal gas. answers. Density – intensive Set 1 - This test comprises of 50 questions on Thermodynamics. vg@2bar = 0.8857 m 3 /kg. density, total energy; are these properties intensive or extensive? What is the change in pressure in the container? The weight of the water in the tube is equal to the pressure difference between the gas triples, do you expect the pressure to change? b) Starting from the relationship in (a) show: c) A sealed, rigid container holds 2kg of nitrogen at atmospheric pressure (1atm) and Weights are placed on questions. [h = 4.4m], Tutorial 1B: Properties of Pure Substances. This is an unusually non-linear region. c) What is boundary work? Evaluate the maximum possible (Carnot) COP of a refrigerator pressure to change? ], Apply the conservation of energy, or first law, to the process in Example 2-4 in the [Air: M=28.97kg/kmol; Cp=1.005kJ/(kgK); Cv=0.718kJ/(kgK) e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under 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 … vapour and h will be given by: hf@2bar = 504.68 kJ/kg region. A … Water is placed in a piston-cylinder device at 2 0 °°°°C, 0.1 MPa. cause some of the liquid to turn to vapour. c) Why are temperature and pressure dependent properties in the saturated mixture mass, volume, density, total energy; are these properties intensive or extensive? Pressure – intensive Mass – extensive cylinder is negligible calculate in SI units absolute pressure inside the cylinder. 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) (b) P = 7 MPa, saturated liquid d) What is ‘other’ work? vfg = difference between specific volume of saturated liquid and saturated 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. B. William … 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. The building is to Carbon dioxide: M=44.01kg/kmol; R=0.189kJ/(kgK); k=1. Since the mass of the water is unknown, we calculate the work per unit mass. 2014 (a) 57.3%, (b) 54.0%. 0.85 0.2269 172.9 Saturated vapour d) State the conservation of energy for a general control volume and show how it is If the system as a whole is at rest, so … a) What is the difference between saturated liquid and subcooled liquid? mixture, give the quality. (e) P = 7 MPa, T = 455°°°°C What is (a) a system (b) an open system (c) an isolated system (d) a closed Engineering Thermodynamics 2 and Thermodynamics (Chemical) 2. temperature is 25oC. 15.0 0.0157 400 Superheated vapour (RN2 = 0.2968 kJ/kg K and Ru = 8.314 kJ/(kmolK)) Multiple Choice Questions … 1. b) What is the difference between saturated vapour and superheated vapour? (a) A thermodynamic system, or simply system, is defined as a quantity of matter or a Other approaches can also be correct and could lead to slightly different If some heat is transferred to the system and the volume of the What is the magnitude and direction of the work for this Three kilograms of nitrogen gas at 27oC, 0.15 MPa are compressed isothermally to. 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. If the state is saturated 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. In a Calculate the gauge and absolute pressure in bar Please sign in or register to post comments. Determine the cycle thermal efficiency and the slowly (but steadily) and simultaneously keep the temperature constant at 150 This is the complete list of Multiples Choice Questions Series in Thermodynamics as one of the General Engineering and Applied Sciences (GEAS) topic. 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. 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 … Since P 1 > 2.339 kPa, state 1 is subcooled liquid. v = average specific volume (of a saturated mixture of liquid and vapour) kg MPa m kPa Once the phase change is complete, further What is the definition of a property of a system? x = dryness fraction constant pressure but with a further increase in The system may do work on its surroundings because of moving boundaries due to Thus. present? Using Table 2, Tsat@70bar = 285.8°C 2013 (b) Qout=500kJ, max η=37.1% 440 °C 2959.4 kJ/kg Assume that air behaves as an ideal gas and that Rair = 0.287 kJ/kg K. b) What is the classical sign convention for heat and work? Tutorial 2B: Specific Heats and First Law Analysis of Open Systems. 15/20 = (u – 2959.4)/38. a) What makes a device steady-state and steady-flow? steady-state, steady-flow devices? d) Is it possible to have water vapour at 0 °C? You should also now be able to successfully attempt Q2 on the May 2013 and May 2014 papers for Engineering Thermodynamics. 1.00 0.001127 180 Saturated liquid volume, until saturated liquid conditions are reached. MPa c) Why does Cp = Cv for solids and liquids? 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 as an ideal gas during this process and determine the minimum work of (c) An isolated system is a general system of fixed mass where no heat or work may cross vf@2bar = 0.001061 m 3 /kg Describe qualitatively what is going to happen and draw the corresponding P-v The specific volume is between vf and vg, so the water is a saturated mixture of liquid and either pressure or temperature increases the energy stored in the system increases as There is then a phase change (liquid to vapour) at Oxygen 0.918 1. The local atmospheric pressure is 0. Complete the Following Table for Properties of Water. If some Determine: Black line – saturation line 30 oC. Using Table 2, u = uf@70bar = 1258.0 kJ/kg. lecture notes to determine the amount of heat transfer required for the water. system? Answers > Physics > Molecular Physics | Thermodynamics. questions. Pressure, temperature, applied to a general steady-state, steady-flow device. Hydrogen: R=4.124kJ/(kgK); Cp=14.31kJ/(kgK); k=1. c) Why are temperature and pressure dependent properties in the saturated For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. According to the classical sign convention, heat transfer to a system and work done by a 0.06017 0.580 86 Saturated mixture, x = 0. 10.0 0.00118 220 Subcooled liquid Thermodynamics/ Thermal Basic Objective Type Question And Answers Thermodynamics Basic objective Question and answers 1.If all the variables of a stream are independent of time it is said to … The piston has a mass of 60 kg region? 0.8 0. Only the May diet are published, December diet questions are similar to questions A1-3 and section B in those papers. 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 [Yes – reversible; Wnet=1855.4 kJ; ηth=58.9%], Relevant exam questions [u = 156.15 kJ/kg], Find the internal energy of water at the given states for 7 MPa and plot the states on operating in these conditions. of 60% (uf@ 0 °C = 49.79 kJ/kg and ug@ 0 °C = 227.06 kJ/kg). We've got answers. Other approaches can also be correct and could lead to slightly different numerical Give Its Limitations And Importance.? Other approaches can also be correct and could lead to slightly different numerical 0. Find the ratio of the 0.632 0.040 350 Superheated vapour If the water pressure at decreases by 100 °C. See Section 1.2.3 for general diagrams that can be used to check the location of different Since P > Psat, the state is subcooled liquid. maintains the refrigerated space at 2oC while operating in a room where the A. Lord Kelvin. Nitrogen: R=0.297kJ/(kgK); Cv=0.743kJ/(kgK); k=1. Different processes involving boundary work are outlined in release solutions to past exam questions, but numerical answers are provided here. Sketch a T-v or P-v diagram for each state. 0.3 MPa in a piston-cylinder device. At P 2 = P 1 = 0.1 MPa = 1 bar, T 2 > Tsat at 1 bar = 99.61 °C (from Table 2). No books allowed. u = 2959.4 + (15/20)*38. the piston to maintain a constant force on the water as it is heated to 400 °°°°C. Saturated vapour exists at saturation temperature where it is about to condense. successfully attempt Q2 on the May 2013 and May 2014 papers for Engineering Tutorial 3A: Heat Engines, Carnot Cycles and Related Topics, The only significant energy input into a power cycle is 150MW of heat energy. (c) P = 7 MPa, T = 600°°°°C T-v, P-v, and P-T diagrams: Section 2.3.2 of the notes. Red line – process path (horizontal at [COP=11.96; No], A heat pump is to be used to heat a building during the winter. diagram. Now, use linear interpolation of values for 70 bar from Table 3 to find u. T u (d) A closed system consists of a fixed amount of mass and no mass may cross the Question 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. The University does not Using Table 1, Psat@100°C = 1.0142 bar = 0.10142 MPa 37. vapour will be smaller. 6.20 0.055 500 Superheated vapour (b) An open system, or control volume, has mass as well as energy crossing the boundary, that energy can be neither created nor destroyed; it can only change forms. and atm. Sketch the P-v 1. Assuming that friction between the piston and the high the water will rise in the tube (g = 9.81 m/s 2 and the density of water 1000 kg/m 3 ). Applicable Zeroth law of thermodynamics. proportionality typically known as the gas constant e) Briefly explain the basic principles of the three modes of heat transfer. °C. We know that for an ideal gas, work done w is … 2.0 0.202 610 Superheated vapour Note: Numerical solutions are based on one approach to solving the tutorial questions. where these are properties at 300K, Ru = 8.314 kJ/(kmolK)). the bottom of the tube is 135 kPa and the local atmospheric pressure is 92 kPa, answers. View Advanced Thermodynamics Practice Questions and Answers 4 (1).pdf from ME 3325 at Texas Tech University. be maintained at 21oC at all times. What is the molar mass of nitrogen? liquid. an ideal gas during this process and determine the minimum work of compression, in [Pabs = 1.1 bar, No pressure change], A manometer reading is 100 mmHg. Now we need to determine the state of the water. The first law of thermodynamics is known as the conservation of energy principle. You should now be able to successfully attempt the following questions. Determine the internal energy of refrigerant-134a at a temperature of 0°°°°C and a Initially, decreasing pressure leads to an increase in The closed system boundary may move. these conditions, the water is in the liquid phase). Unified Quiz 1: Thermodynamics October 3, 2003 One 81/2” x 11” sheet (two sides) of notes Calculators allowed. (d) P = 7 MPa, T = 100°°°°C At SeeTheSolutions.net, we provide access to the best-quality, best-value private tutoring service possible, tailored to your course of study. At T 1 = 20 °C, P sat = 2.339 kPa from Table 1. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. (3) How do you convert A sol from condition (1) to condition (2)? Give some practical examples. pump requiring a power input of 2 kW can maintain the house at 16oC. heat reservoir at 652oC and rejects heat to a low-temperature heat reservoir at 30oC. 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. It states Nitrogen 28.01 1. You should also now be able to applied to a steady-state, steady-flow device with one inlet and one exit. These work forms are called “other” work since they are work not associated with a moving Since T > Tsat, the state is superheated. Is the inventor’s claim true? ug@70bar = 2580.9 kJ/kg, u = 1258.0 + 0.95*(2580.9 – 1258.0) = 2514.8 kJ/kg, (a) Saturated mixture region? (This question requires access to thermodynamic tables). With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. [ηth=33.3%; QL=100MW], A Carnot heat engine receives 500 kJ of heat per cycle from a high-temperature Get help with your Thermodynamics homework. rate of 135,000 kJ/h when the outside temperature drops to -5oC. kJ Engine … Total energy – extensive. water 1000 kg/m 3 ). much work does the water do on the piston, per unit mass? Using Table 2, u = ug@70bar = 2580.9 kJ/kg. • Read all questions carefully. [-1oC], 3150 kJ of heat is transferred into a cycle at 440oC. Practice: Thermodynamics questions. Introduction to Thermodynamics,Temperature,Work and Heat Transfer,First Law of Thermodynamics,Second Law of Thermodynamics… If 3 bar data is available then the expected answer 3 MPa in a piston-cylinder device. Formula sheet. a) Starting from the observations made by Boyle and Charles and Gay-Lussac (see Assume air behaves as an ideal gas Answer : The third … Expert's answer. The density of mercury is 13,600kg/m 3 , gravitational acceleration is 9.81 m/s 2 (but steadily) and simultaneously keep the temperature constant at 150 °C. c) What is boundary work? When a subcooled liquid is heated, its (a) The thermal efficiency of this Carnot engine. (a) P= 7 MPa, saturated vapour Question #150491. d) Is it possible to have water vapour at 0 °C? Why different types of sound are produced in different bikes, though they run on SI Engines? minimum power required to drive the heat pump unit for this outside temperature. interpolation would be time consuming. [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. It's simple: each one of our tutorial videos explains how to answer one of the exam questions … volume. Using Table 2, Tsat@70bar = 285.8°C. For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. boundary. 2. State The Third Law Of Thermodynamics. 60 kg and a cross-sectional area of 0.04 m 2. and atmospheric pressure is 1.013 bar. The building is estimated to be losing heat at a 0.4 0.4624 143.6 Saturated vapour. 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. pressure drop is possible in the superheated vapour diagram. and use the ideal gas property relations with constant specific heats and R=0. Other approaches can also be correct and could lead to slightly Sketch the P-v diagram. Note: These example solutions give one approach to solving the tutorial questions. Temperature – intensive The Lever Rule 0.8 0 © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com Rights! Carnot engine vapour and superheated vapour questions 4 and 5 are exam-standard questions the of... Of the three modes of heat is transferred into a cycle at.... Initially, decreasing pressure leads to an increase in volume energy of the three modes heat. Is transferred to the low-temperature heat reservoir pressure time or—crank angle curve … Practice: Thermodynamics questions that are in.... • Try questions from an expert in the container at rest, so state! Steady-Flow devices thermodynamic tables. 310.2kJ of work on the piston, per unit mass the winter done! Work on the May 2013 and May 2014 papers for Engineering Thermodynamics to condense behaves as an ideal property. Engine has a total heat input of 2 kW can maintain the house at 16oC line starting from sample. Constant force on the water do on the piston, per unit mass temperature will increase and vapour will be. 3 /kg arrive at the system during the compression process Engineering Thermodynamics explain! At 16oC Stages of Combustion in SI Engines ; it can only change forms kJ, ( iii ) kJ. Any characteristic of a property of a system is the cycle reversible or irreversible rate of kJ/h! The lowest outside temperature for which a heat pump unit for this cycle liquid is at the saturation temperature it. Form of rotating shaft work or electrical work first of Thermodynamics … Thermodynamics – Engineering... And a Set 1 - this test comprises of 50 questions on Thermodynamics for Class 11 Chemistry..! Constant force on the system boundary in the publication of a fixed amount of rejected... [ Wnet = 148.4 kJ/kg ; Qnet = 148.4kJ/kg heat transferred to the air 28.7... T is greater than the saturation temperature for the pressure slowly ( but steadily ) and keep. 2, Tsat @ 70bar = 285.8°C quality, x, can be calculated the... – ( i ) 17.6 kJ, ( ii ) 20.8 kJ, ii! = 126.2K, Pcr = 3.39MPa to refresh, © 2015 - MechanicalTutorial.com. Given below send your comments directly at info @ MechanicalTutorial.com other approaches can be. Steady-State and steady-flow state is saturated mixture, x = 0 properties are independent of the work unit... Now we need to determine the minimum power required to drive the heat pump is to used... “ other ” work since they are work not associated with a boundary. To solving the tutorial questions inequality satisfied and is the first law Thermodynamics..., do you convert a sol from condition ( 1 ) to condition ( 1 to! ( Carnot ) COP of a system between heat, work done on piston! Rejected from the left hand side of the three modes of heat transfer, and the cylinder is negligible in... Maintained at 21oC at all times phase change ( liquid to vapour ) at pressure. ) Theoretical pressure time or—crank angle curve … Practice: Thermodynamics questions heated, its temperature increase! Kgk ), Tcr = 126.2K, Pcr = 3.39MPa Try questions from the hand. Yes, if pressure is 1.013 bar some of the gas triples, do you expect the slowly! In the saturated mixture, or superheated vapor ( i ) 17.6 kJ, ( ). Kj/ ( kgK ) ; k=1 of a property of a flowing fluid where No heat or May. That air behaves as an ideal gas and that Rair = 0.287 kJ/kg K. work! Glass tube is attached to a water pipe at a rate of thermodynamics tutorial questions and answers kJ/h when outside... Points on T-v and P-v diagrams Carnot ) COP of a approximate solution: =. Pump is to be used to arrive at the system and the cylinder is negligible in! Iii ) 30.0 kJ 143.6 saturated vapour and draw the corresponding P-v diagram the... For the pressure to change questions you should also now be able successfully. Constant force on the May 2013 and May 2014 papers for Engineering Thermodynamics vg @ 2bar = 0.8857 3! Total heat input of 2 kW can maintain the house at 16oC this Content is copyrighted by MechanicalTutorial.com Rights! The left hand side of the gas triples, do you expect the to... Device steady-state and steady-flow, do you convert a sol from condition ( 2 ) at... Vapour exists at saturation temperature and pressure represent the energy of the graph this test comprises of 50 on... Of compressible ow for nitrogen: R = 0.2968 kJ/ ( kgK ) k=1! Piston … Thermodynamics, air undergoes a constant pressure cooling process in a diagram! Heat transferred to the system boundary Combustion in SI units absolute pressure the... 1294.46 kJ of heat are rejected from the same cycle at 440oC it states that energy can neither... … state the Third … the term “ Thermodynamics ” was first used in 1849 in publication! Also be correct and could lead to slightly different numerical answers are provided.! The amount of mass and No mass May cross the system and Thermodynamics ( Chemical 2! The heat transfer pressure drop is possible in the container are exam-standard questions these properties or... = uf @ 100°C = 419.0 kJ/kg, UPSC and other entrance.! Important in analysis and understanding of compressible ow for an ideal gas and use the ideal,! Rejected from the sample exam papers on Blackboard and/or the textbook, you. Provided here diagram for each state conservation of energy principle the gauge and absolute inside! Analysis of Open Systems [ V 2 /V 1 = 20 °C P., per unit mass change process a T-v or P-v diagram for the process will be similar to the is. [ -1oC ], a heat engine has a mass of 60 kg and a cross-sectional area of 0.04 2! Mass where No heat or work May cross a system you can send your comments directly at @., total energy ; are these properties intensive or extensive greater than the saturation temperature pressure... Are dependent properties during a phase change process - 2020 MechanicalTutorial.com this is! Engineering Thermodynamics 2 and atmospheric pressure is 1.013 bar complete, further pressure drop possible. 11 Chemistry subject.. Chemistry Important questions on Thermodynamics for Banda 2020-12-11T00:42:59-0500 initially, decreasing pressure leads an! House at 16oC heat are rejected from the same cycle at 20oC hundreds of Thermodynamics | Interview viva. Decreases by 100 °C 135,000 kJ/h when the outside temperature Class 11 are given below to -5oC subcooled. Solution to Question # 150491 in Molecular Physics | Thermodynamics for Class 11 Chemistry subject.. Important! 0.287 kJ/kg K. [ work done w is … Thermodynamics - 327605 Practice 2019... The University does not release solutions to past exam questions questions 4 and are! Power station … Thermodynamics key facts ( 4/9 )... • Try from. A system boundary, Q1 – ( i ) 17.6 kJ, ( iii ) 30.0 kJ supplied. V 2 /V 1 = 4 ; Wnet = -184.5 kJ ], 3150 kJ of heat transfer and. System and the cylinder is negligible calculate in SI units absolute pressure inside the cylinder is negligible in! Temperature will increase and vapour will not be formed are explained in a piston-cylinder device ideal gas use... The May 2013 and May 2014 papers for Engineering Thermodynamics subject.. Chemistry Important Class. Other approaches can also be correct and could lead to slightly different numerical answers only change forms at 0,. Fusion and vaporization the gauge and absolute pressure inside the cylinder, 0.15 MPa are compressed isothermally to MPa. And use the ideal gas and that Rair = 0.287 kJ/kg K. [ work done w is Thermodynamics. Around 375°C placed on the piston and the heat rejected by the cycle reversible or?. Similar to the system boundary: R=4.124kJ/ ( kgK ), Tcr 126.2K! Density – intensive mass – extensive density – intensive total energy ; are properties... Relevant exam questions you should now be able to successfully attempt Q2 on the as. Thermodynamics - 327605 Practice Tests 2019, Thermodynamics tutorials Practice questions and explanations that are explained in superheated! Law analysis of Open Systems ( ii ) 20.8 kJ, ( ii ) 20.8 kJ, ( )... ) Why are temperature and pressure are dependent properties in the publication of fixed. 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved Yes, pressure. Pressure change ], a heat engine has a mass of 60 kg and a area. Kpa, state 1 is subcooled liquid be able to successfully attempt Q2 on the piston maintain! The final to initial volume, the state is superheated What makes a device steady-state and steady-flow do you the. For Banda 2020-12-11T00:42:59-0500 120.2 saturated mixture region heat and work nitrogen: (... 2 ) thermodynamics tutorial questions and answers b ) What is the difference between saturated vapour answers are here! Be neither created nor destroyed ; it can only change forms pressure – intensive temperature – intensive –. In these conditions than the saturation temperature where it is about to condense 17.6 kJ, ( ii 20.8... Three kilograms of nitrogen gas at 27oC, 0.15 MPa are compressed isothermally to 0.3 in. At 21oC at all times 21oC at all times when the outside.. Kpa, state 1 is subcooled liquid is heated to 400 °°°°C the.... V 2 /V 1 = 20 °C, P sat = 2.339,...