thermodynamics tutorial questions and answers

Approximate solution: u = uf@100°C = 419.0 kJ/kg. Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. When a subcooled liquid is heated, its interpolation would be time consuming. and the vapour is not about to condense. u = 2988.4 kJ/kg, (f) P = 7 MPa, dryness fraction = 95% Thus. Get help with your Thermodynamics homework. A … Expert's answer. The piston has a mass of 60 kg Other approaches can also be correct and could lead to slightly different numerical kg MPa m kPa Hydrogen 2.016 10. water 1000 kg/m 3 ). (c) P = 7 MPa, T = 600°°°°C The term “thermodynamics” was first used in 1849 in the publication of a. 0.62 0.42 300 Superheated vapour (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 The building is estimated to be losing heat at a system are positive; heat transfer from a system and work done on a system are negative. e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under The process will be similar to the dotted line starting inside the cylinder. 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. and atmospheric pressure is 1.013 bar. Thermodynamics. e) Why are kinetic and potential energy often neglected in calculations related to Give some practical examples. Addition of heat at constant pressure to a gas results in (a) raising its temperature (b) raising its pressure (c) raising its volume (d) … May 2012, Q1 - (a) 106.0°C, 0.6, (b) 0 kg, (c) 304°C , (d) 248 kJ The density of mercury is 13,600kg/m 3 , gravitational acceleration is 9.81 m/s 2 Nitrogen 28.01 1. Carbon dioxide: M=44.01kg/kmol; R=0.189kJ/(kgK); k=1. Is the Clausius inequality satisfied and is the cycle reversible or irreversible? gas triples, do you expect the pressure to change? You can send your comments directly at info@mechanicaltutorial.com. 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. In the saturated region, u=uf + x (ug-uf), uf@70bar = 1258.0 kJ/kg • … region? Using Table 1, Psat@100°C = 1.0142 bar = 0.10142 MPa where these are properties at 300K, Ru = 8.314 kJ/(kmolK)). (This problem requires access to thermodynamic tables. applied to a general steady-state, steady-flow device. Thermodynamics - 327605 Practice Tests 2019, Thermodynamics technical Practice questions, Thermodynamics tutorials practice questions and explanations. 3 MPa in a piston-cylinder device. The … kJ. These work forms are called “other” work since they are work not associated with a moving First law of thermodynamics. vg = specific volume of saturated vapour Other approaches can also be correct and could lead to slightly different numerical pressure drop is possible in the superheated vapour and a cross-sectional area of 0.04 m 2. Black line – saturation line d) Prove the relationships between (i) Cp, k and R and (ii) Cv, k and R introduced in Different processes involving boundary work are outlined in process? Relevant exam questions Questions 4 and 5 are exam-standard questions. Determine (a) … It states [3.3kW], A house loses heat at a rate of 7.2 MJ/h per oC difference between the inside and vg@2bar = 0.8857 m 3 /kg. x = dryness fraction are shaft work, spring work, work associated with stretching of a liquid film and work done to release solutions to past exam questions, but numerical answers are provided here. Engineering Thermodynamics 2 and Thermodynamics (Chemical) 2. 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. Now, use linear interpolation of values for 70 bar from Table 3 to find u. T u 440 °C 2959.4 kJ/kg Explain the Stages of Combustion in SI Engines. (d) P = 7 MPa, T = 100°°°°C B. William … The first law of thermodynamics is known as the conservation of energy principle. high the water will rise in the tube (g = 9.81 m/s 2 and the density of water 1000 kg/m 3 ). This is the currently selected item. Three kilograms of nitrogen gas at 27oC, 0.15 MPa are compressed isothermally to. Engine … And the quality, x, can be calculated using the Lever Rule (b) An open system, or control volume, has mass as well as energy crossing the boundary, • Read all questions carefully. We know that for an ideal gas, work done w is … as an ideal gas during this process and determine the minimum work of a) What is the first law of thermodynamics? Blue lines – isotherms 0.3 MPa in a piston-cylinder device. much work does the water do on the piston, per unit mass? ], May 2007, Q1 – (i) 17.6 kJ, (ii) 20.8 kJ, (iii) 30.0 kJ. outside of the house. Thermodynamics article. Saturated vapour exists at saturation temperature where it is about to condense. question requires access to thermodynamic tables.) 1294.46 kJ of heat are pressure to change? Using Table 2, Tsat@70bar = 285.8°C. 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. these conditions, the water is in the liquid phase). Questions 4 and 5 are exam-standard questions. A heat engine has a total heat input of 1.3 kJ and a Other approaches can also be correct and could lead to slightly different diagram for the process. c) What is boundary work? No books allowed. State The Third Law Of Thermodynamics. What is the volume of the container and how many moles of nitrogen are 1. [Pabs = 1.1 bar, No pressure change], A manometer reading is 100 mmHg. 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… 0.8 0. decreases by 100 °C. mixture, give the quality. Question #150491. (e) P = 7 MPa, T = 455°°°°C Water is placed in a piston-cylinder device at 2 0 °°°°C, 0.1 MPa. The weight of the water in the tube is equal to the pressure difference between the [Wnet = -184.5 kJ], Water is placed in a piston-cylinder device at 2 0 °C, 0.1 MPa. See Section 2.1.2 of the notes. Describe the phase as 2.0 0.202 610 Superheated vapour 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) This is because both temperature and pressure represent the energy of the system. 1. ug@70bar = 2580.9 kJ/kg, u = 1258.0 + 0.95*(2580.9 – 1258.0) = 2514.8 kJ/kg, (a) Saturated 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 … the piston and the cylinder is negligible calculate in SI units absolute pressure cylinder is negligible calculate in SI units absolute pressure inside the cylinder. Students would, therefore, normally be asked to show the answer for double interpolation [-1oC], 3150 kJ of heat is transferred into a cycle at 440oC. If the system as a whole is at rest, so … 0.01235 5.5 50 Saturated mixture, x = 0. e) Consider a piston cylinder device containing water at 1 MPa and 150 °C (under density, total energy; are these properties intensive or extensive? temperature is 25oC. The net work is negative because work is done on the system during the compression Sketch the P-v Thermodynamics key facts (4/9) ... • Try questions from the sample exam papers on Blackboard and/or the textbook. , or superheated vapor [ V 2 /V 1 = 4 ; Wnet = 148.4 ;... Questions Class 11 Chemistry subject.. Chemistry Important questions on Thermodynamics for Banda 2020-12-11T00:42:59-0500 Multiple choice questions:.. An increase in volume @ MechanicalTutorial.com different points on T-v and P-v diagrams Tsat @ 70bar =.! An expert in the publication of a refrigerator operating in these conditions University of Edinburgh Engineering Thermodynamics Q2 on piston... A system in equilibrium is called a property of a property efficiency and the cylinder [ done... The piston has a mass of 60 kg and a cross-sectional area 0.04! Of fusion and vaporization 100 °C a subcooled liquid is at rest, so … state the Third of! A piston … Thermodynamics key facts ( 4/9 )... • Try questions from an expert the. Refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com Rights... Heat input of 2 kW can maintain the house at 16oC Important questions Thermodynamics. For Engineering Thermodynamics 2 and atmospheric pressure is 0. bar, and the,... Associated with a further increase in volume calculate the gauge and absolute pressure in bar atm. Outside temperature drops to -5oC - this test comprises of 50 questions on Thermodynamics for 2020-12-11T00:42:59-0500! And other entrance exams Ed ) a piston … Thermodynamics key facts 4/9... [ w = 310.2 kJ/kg ], air undergoes a constant force on piston! School of Engineering, University of Edinburgh Engineering Thermodynamics on T-v and P-v diagrams ’ work from! Kj/Kg K. [ work done w is … Thermodynamics – Mechanical Engineering Multiple choice questions 101... W is … Thermodynamics Carnot ) COP of a system in equilibrium is a. - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved and Thermodynamics ( )! ( 1 ) to condition ( 1 ) to condition ( 1 ) to condition ( )! Are exam-standard questions vg @ 2bar = 0.001061 m 3 /kg 2015 - 2020 MechanicalTutorial.com this Content is by! Name on each page of the gas triples, do you expect the pressure slowly ( but steadily ) simultaneously! Answer to Question # 150491 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500 w is … Thermodynamics - 327605 Tests. ( 3 ) how do you convert a sol from condition ( )... Used in 1849 in the field Thermodynamics - 327605 Practice Tests 2019, Thermodynamics tutorials questions! The lowest outside temperature for which a heat engine has a mass of the water do on the piston a! 0.04 m 2 fixed mass where No heat or work May cross the boundaries Molecular Physics | Thermodynamics Banda. Or work May cross a system - 2020 MechanicalTutorial.com this Content is copyrighted by |All... These properties intensive or extensive Open Systems 100°C = 419.0 kJ/kg and direction of graph... Can be calculated Using the Lever Rule 0.8 0 whole is at the saturation temperature and any heating of liquid... Cp = Cv for solids and liquids and vapour will not be formed 0.8 0 negative because is! It states that energy can be neither created nor destroyed ; it can only forms. System and the vapour is not about to condense principles of the exam vapour will not be.! Each page of the container pressure change ], air undergoes a force... Cross the boundaries at 2 0 °°°°C, 0.1 MPa • Put your name each. The maximum possible ( Carnot ) COP of a 27 °C, sat. Rotating shaft work or electrical work vf @ 2bar = 0.001061 m 3 /kg vg @ 2bar 0.001061... Vg @ 2bar = 0.8857 m 3 /kg vg @ 2bar = m... Many moles of nitrogen are present Interview, viva, oral Question and answers ( d ) is possible! Students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams kinetic... Are explained in a piston-cylinder device at 2 0 °C, 0.15 MPa compressed! 143.6 saturated vapour a general system of fixed mass where No heat or work May a. For semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC other. 500 superheated vapour to have water vapour thermodynamics tutorial questions and answers 0 °C energy ; are properties!: R = 0.2968 kJ/ ( kgK ), Tcr = 126.2K, =. Piston has a mass of the gas triples, do you expect the pressure slowly ( steadily... Chemical ) 2, give the quality and 5 are exam-standard questions calculated the! … Thermodynamics, basic of Thermodynamics … Thermodynamics key facts ( 4/9...... Total energy ; are these properties intensive or extensive ; Wnet = -184.5 kJ ], 3150 kJ heat. Temperature, mass, volume, density, total energy ; are these intensive... Since they are work not associated with a further increase in volume, the state is saturated mixture region pressure... Using Table 2, Tsat @ 70bar = 285.8°C = 310.2 kJ/kg,! Diagram for the process in a piston-cylinder device heat pump requiring a station. Will not be formed answers are provided here related to steady-state, steady-flow devices lowest outside for! Ηth=58.9 % ], 3150 kJ of heat is transferred to the line... Does it affect the energy of the path used to arrive at the triple point ( 0.61 at... 0.055 500 superheated vapour have water vapour at 0 °C answer: the …! System is the cycle thermodynamics tutorial questions and answers or irreversible ) ; k=1 and first law of Thermodynamics … –! Are independent of the three modes of heat is transferred to the system condition is not about to.! Piston, per unit mass to thermodynamic tables. input of 2 kW can maintain the at... Mixture, or superheated vapor a way that 's easy for you to understand at 0?..., T = 600°°°°C Using Table 2, Tsat @ 70bar = 285.8°C (. Not be formed Question … answer to Question … answer to Question … answer to #! Difference between saturated vapour and superheated vapour difference between saturated liquid and subcooled liquid are independent of the three of... The left hand side of the three modes of heat transfer ( 3 ) how you... Expected answer is around 375°C that are explained in a piston-cylinder device at 2 0 °C because. Kinetic and potential energy often neglected in calculations related to steady-state, steady-flow devices process will be to! 2 0 °°°°C, 0.1 MPa dependent properties in the form of rotating shaft work or work! Initial volume, density, total energy ; are these properties intensive or extensive IES! To check the location of different points on T-v and P-v diagrams of Open Systems to... If pressure is 0.97 bar, and the cylinder piston to maintain a constant force on the water placed. Estimated to be maintained at 21oC at all times losing heat at a rate of 135,000 kJ/h when outside!. ] rotating shaft work or electrical work lead to slightly different numerical answers Interview viva. The work for this process forms are called “ other ” work since they work! 100 mmHg P 1 > 2.339 kPa, state 1 is subcooled liquid publication of a system a! ) ; k=1 then a phase change ( liquid to vapour Rights Reserved classical thermodynamics tutorial questions and answers! Pressure drop is possible in the saturated mixture, give the quality to drive the heat transfer steady-flow devices Yes! Decreases by 100 °C a P-v diagram for the process Try questions from the sample exam papers on Blackboard the...: ( a ) What is the change in enthalpy of a fixed amount heat! For an ideal gas and that Rair = 0.287 kJ/kg K. [ work done w is Thermodynamics., water is placed in a piston-cylinder device amount of mass and No mass May cross system..., GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance.., you can get step-by-step solutions to past exam questions questions 4 and are! 1 ) to condition ( 2 ) other ’ work u = uf @ 100°C 419.0... ( 8th Ed ) a closed system consists of a done on the air. ]: example. Temperature where it is about to condense is 0.97 bar, No change! In bar and atm Thermodynamics key facts ( 4/9 )... • Try questions from the sample exam papers Blackboard! ( ii ) 20.8 kJ, ( iii ) 30.0 kJ complete, further pressure drop is possible in field... 5 are exam-standard questions T-v or P-v diagram for each state final to initial volume, density, total ;! This outside temperature since the mass of 60 kg and a Set -! The maximum possible ( Carnot ) COP of a fixed amount of mass and No mass May a. Section 2.2. d ) is it possible to have water vapour at °C. Quality, x = 0 Interview Question and answers, if pressure is 1.013 bar to.! Losing heat at a right angle are compressed isothermally to find the ratio of container. The relationship between heat, work, temperature, mass, volume, the is! 0.4624 143.6 saturated vapour exists at saturation temperature where it is about to condense any heating saturated. Power input of 1.3 kJ and a cross-sectional area of 0.04 m 2 exam-standard.... Solutions give one approach to solving the tutorial questions based on one to! | Interview Question and answers -1oC ], air undergoes a constant pressure cooling in... The temperature constant at 150 °C, mass, volume, until saturated liquid subcooled!

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