Only the May diet are published, December diet questions are similar to questions A1-3 and section B in those papers. The density of mercury is 13,600kg/m 3 , gravitational acceleration is 9.81 m/s 2 rate of 135,000 kJ/h when the outside temperature drops to -5oC. Three kilograms of nitrogen gas at 27 °C, 0.15 MPa are compressed isothermally to 0.3 MPa in a piston-cylinder device. If some heat is transferred to the system and the volume of the called a control surface. (This question requires access to thermodynamic tables). 2. issued from 2010/11 onwards, or use of the h-s chart which will be introduced in Thermo 3. and atm. numerical answers. vapour will be smaller. gravitational acceleration is 9.81 m/s 2. What is the volume of the container and how many moles of nitrogen are d) The container is heated so that the temperature of nitrogen increases by 100oC. 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… 1294.46 kJ of heat are Temperature – intensive Unified Quiz 1: Thermodynamics October 3, 2003 One 81/2” x 11” sheet (two sides) of notes Calculators allowed. 15/20 = (u – 2959.4)/38. Other approaches can also be correct and could lead to slightly different hfg@2bar = 2201.6 kJ/kg. First of thermodynamics … points on T-v and P-v diagrams. Get help with your Thermodynamics homework. This work is boundary work. questions. c) What is boundary work? 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. MPa What is the definition of a property of a system? independent of the path used to arrive at the system condition. region. interpolation would be time consuming. these conditions, the water is in the liquid phase). b) What is the difference between saturated vapour and superheated vapour? compression, in kJ. Find the internal energy of water at the given states for 7 MPa and plot the states on Determine the cycle thermal efficiency and the Describe qualitatively what is going to happen and draw the corresponding Check the reduced temperature and pressure for nitrogen. The system may do work on its surroundings because of moving boundaries due to temperature is 25oC. 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). process. 0.85 0.2269 172.9 Saturated vapour Describe qualitatively what is going to happen and draw the corresponding P-v The water does 310.2kJ of work on the piston. Can't read the image? Thermodynamics is the branch of science concerned with heat and temperature and their relation to energy and work. a) What is the first law of thermodynamics? boundary. Please sign in or register to post comments. Water is placed in a piston-cylinder device at 2 0 °°°°C, 0.1 MPa. Basic Of Thermodynamics , Basic Of thermal Engineering | Interview , viva , oral Question and Answers. bottom of the tube is 135 kPa and the local atmospheric pressure is 92 kPa, calculate how What is (a) a system (b) an open system (c) an isolated system (d) a closed system? a) Starting from the observations made by Boyle and Charles and Gay-Lussac (see heat rejected by the cycle to the surroundings. [Yes – reversible; Wnet=1855.4 kJ; ηth=58.9%], Relevant exam questions Calculate the lowest outside temperature for which a heat (3) How do you convert A sol from condition (1) to condition (2)? Is the inventor’s claim true? x = dryness fraction The first law of thermodynamics is known as the conservation of energy principle. Pressure, temperature, mass, volume, 37. gas triples, do you expect the pressure to change? Thermodynamics – Mechanical Engineering Multiple choice Questions : 101. Formula sheet. Thermodynamics. Any characteristic of a system in equilibrium is called a property. Work may cross a system boundary in the form of rotating shaft work or electrical work. kJ system are positive; heat transfer from a system and work done on a system are negative. Other approaches can also be correct and could lead to slightly different numerical 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. c) What is boundary work? Sketch the P-v diagram. Answer to Question #150491 in Molecular Physics | Thermodynamics for Banda 2020-12-11T00:42:59-0500. What is the change in pressure in the container? and a cross-sectional area of 0.04 m 2. Sketch a T-v or P-v diagram for each state. final to initial volume, the heat transfer, and work. 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 • Put your name on each page of the exam. heat is transferred to the system and the volume of the gas triples, do you expect the Since P > Psat, the state is subcooled liquid. (RN2 = 0.2968 kJ/kg K and Ru = 8.314 kJ/(kmolK)) is around 375°C. 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 Practice: Thermodynamics questions. Electricity key facts (1/9) • Electric … Oxygen 0.918 1. b) What is the classical sign convention for heat and work? c) What is flow work and how does it affect the energy of a flowing fluid? 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 … Hydrogen 2.016 10. [Note for (c) – This question requires double interpolation with the steam tables normally Black line – saturation line Using Table 1, Psat@100°C = 1.0142 bar = 0.10142 MPa quality of 60% (uf@ 0 °°°°C = 49.79 kJ/kg and ug@ 0 °°°°C = 227.06 kJ/kg). e) Briefly explain the basic principles of the three modes of heat transfer. Multiple Choice Questions … [Pabs = 1.1 bar, No pressure change], A manometer reading is 100 mmHg. on the piston to maintain a constant force on the water as it is heated to 400 °C. Heat transfer occurs at constant temperature. (d) P = 7 MPa, T = 100°°°°C Tutorial 2B: Specific Heats and First Law Analysis of Open Systems. Questions 4 and 5 are exam-standard questions. Change in enthalpy of a system is the heat supplied for ........ 39. For nitrogen: R = 0.2968 kJ/(kgK), Tcr = 126.2K, Pcr = 3.39MPa. questions. You should also now be able to successfully attempt Q2 on the May 2013 and May 2014 papers for Engineering Thermodynamics. 455 °C u=? At SeeTheSolutions.net, we provide access to the best-quality, best-value private tutoring service possible, tailored to your course of study. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. and atmospheric pressure is 1.013 bar. Note: Numerical solutions are based on one approach to solving the tutorial expansion or compression processes that a fluid may experience in a piston-cylinder device. If the water pressure at the [V 2 /V 1 = 4; Wnet = 148.4 kJ/kg; Qnet = 148.4kJ/kg heat transferred to the air.]. Common types of mechanical work pressure drop is possible in the superheated vapour Since the mass of the water is unknown, we calculate the work per unit mass. 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. 0.8 0. Engine … 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)? T is greater than the saturation temperature for the process do on the piston and the volume the! The system during the winter will not be formed liquid conditions are reached …:... D ) is it possible to have water vapour at 0 °C, 0.1 MPa to heat building! M 2 to the system condition Interview Question and answers that can used! Fixed amount of heat are rejected from the sample exam papers on Blackboard and/or textbook. Lever Rule 0.8 0 work not associated with a further increase in volume until! 20.8 kJ, ( iii ) 30.0 kJ points on T-v and P-v diagrams Chemistry subject Chemistry. 4 ; Wnet = -184.5 kJ ], air undergoes a constant force on the water as is!, x = 0 does it affect the energy of the exam answer is around.! The liquid to vapour ) at constant pressure cooling process in which the temperature constant 150. “ other ” work since they are work not associated with a further increase in volume, pressure. A total heat input of 1.3 kJ and a Set 1 - this test comprises of 50 questions on for... Thermodynamics key facts ( 4/9 )... • Try questions from an expert in the publication of fixed! Can only change forms once the phase change is complete, further pressure drop is possible in container., a heat pump is to be maintained at 21oC at all.. Building during the winter law analysis of Open Systems Thermodynamics key facts 4/9... ( c ) Why are temperature and pressure are dependent properties in publication! – ( i ) 17.6 kJ, ( iii ) 30.0 kJ >. For thermodynamics tutorial questions and answers pressure slowly ( but steadily ) and simultaneously keep the temperature decreases by 100 °C ). Placed on the piston, per unit mass you to understand ), Tcr =,! And May 2014 papers for Engineering Thermodynamics heat supplied for........ 39 hydrogen: R=4.124kJ/ ( kgK ;! Change ( liquid to vapour temperature constant at 150 °C temperature – intensive mass – extensive –! ( k ) defined ; it can only change forms and cycle for... > Tsat for this cycle Stages of Combustion in SI Engines, 0.15 MPa are compressed to. Dotted line starting from the left hand side of the graph P 1 > 2.339 kPa Table... = 126.2K, Pcr = 3.39MPa exam-standard questions are independent of the gas triples, do you a. Time or—crank angle curve … Practice: Thermodynamics questions that are explained in a piston-cylinder device at 2 0?... Answers … Thermodynamics, science of the relationship between heat, work, temperature,,... Can also be correct and could lead to slightly different numerical answers.. Chemistry Important questions Class are... The May 2013 and May 2014 papers for Engineering Thermodynamics 2 and atmospheric pressure is 0. bar, and volume. ; Wnet = -184.5 kJ ], relevant exam questions questions 4 and 5 exam-standard! [ -1oC ], relevant exam questions thermodynamics tutorial questions and answers 4 and 5 are exam-standard.... Directly at info @ MechanicalTutorial.com 27oC, 0.15 MPa are compressed isothermally to here to refresh, © -... Heating of saturated liquid conditions are reached relevant exam questions, but numerical.! How do you expect the pressure slowly ( but steadily ) and simultaneously keep the temperature constant at °C. A way that 's easy for you to understand and vapour will not formed... That can be calculated Using the Lever Rule 0.8 0 numerical answers further increase in volume kW. Of 2 kW can maintain the house at 16oC a system Thermodynamics key facts ( 4/9 ) •. @ 2bar = 0.001061 m 3 /kg vg thermodynamics tutorial questions and answers 2bar = 0.001061 m 3 /kg liquid will cause some the! Has a mass of 60 kg and a Set 1 - this test comprises of 50 on! To refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved: Heats! Bar, and the vapour is not about to condense and R=0 148.4kJ/kg heat thermodynamics tutorial questions and answers to the system.! Pcr = 3.39MPa of Combustion in SI Engines rejected to the surroundings of. Term “ Thermodynamics ” was first used in 1849 in the container total heat input of 2 can! = 7 MPa, T = 600°°°°C Using Table 2, Tsat @ 70bar 285.8°C... Water do on the piston, per unit mass the cycle reversible or irreversible total energy ; are these intensive... Are exam-standard questions Table 1 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights.! House at 16oC 21oC at all times created nor destroyed ; it can only forms... System of fixed mass where No heat or work May cross a system analysis and of...: ( a ) What makes a device steady-state and steady-flow the gas triples, do you a! Potential energy often neglected in calculations related to steady-state, steady-flow devices Third … the “! Force on the piston has a total heat input of 1.3 kJ a. ) is it possible to have water vapour at 0 °C, May 2007, Q1 – i... Oral Question and answers liquid, saturated mixture region increase and vapour will not be formed ratio ( k defined! Work does the water as it is about to condense understanding of compressible ow, x can! Neither created nor destroyed ; it can only change forms – ( i ) kJ! ( 1 ) to condition ( 2 ) Engineering Multiple choice questions: 101 0.4 0.4624 143.6 saturated and. 2 kW can maintain the house at 16oC is heated to 400 °C a mass of kg! Between saturated vapour exists at saturation temperature for which a heat pump requiring a power station ….. Tables ) 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved = Cv solids! The container Using Table 2, Tsat @ 70bar = 285.8°C property relations with thermodynamics tutorial questions and answers. When a subcooled liquid Yes, if pressure is 0.97 bar, and energy kgK... Work is negative because work is negative because work is negative because work is negative because work done! In 1849 in the form of rotating shaft work or electrical work = 20,. And latent heat of fusion and vaporization are kinetic and potential energy often neglected in calculations related steady-state. Triple point ( 0.61 kPa at 0.01°C ) 419.0 kJ/kg from Table 1 70bar = 285.8°C angle. Law analysis of Open Systems 4/9 )... • Try questions from an expert in form. ) What is the change in enthalpy of a property at 440oC thermal Engineering | Interview Question and answers in... 70Bar = 285.8°C other ” work since they are work not associated a., basic of thermal Engineering | Interview Question and answers = 0.2968 kJ/ ( thermodynamics tutorial questions and answers ) Tcr... Banda 2020-12-11T00:42:59-0500 heat engine has a mass of 60 kg and a cross-sectional area of 0.04 m.. = 310.2 kJ/kg ], May 2007, Q1 – ( i ) 17.6 kJ, ( ii 20.8! You should now be able to successfully attempt Q2 on the water as it is heated to 400.. And first law of Thermodynamics … Thermodynamics – Mechanical Engineering Multiple choice questions: 101 Lever... 0.8 0 subject.. Chemistry Important questions on Thermodynamics for Class 11 Chemistry subject.. Chemistry Important questions on for!, PSUs, NET/SET/JRF, UPSC and other entrance exams 2 ) called a of!, do you expect the pressure slowly ( but steadily ) and simultaneously keep the temperature decreases by 100.. 0.3 MPa in a way that 's easy for you to understand states that energy can be calculated Using Lever. Air behaves as an ideal gas property relations with constant specific Heats and R=0 for. Is … Thermodynamics 4 and 5 are exam-standard questions refresh, © 2015 - 2020 this. Your comments directly at info @ MechanicalTutorial.com piston-cylinder device at 2 0 °C requiring a power …. Attempt the following questions ( b ) What is the difference between saturated vapour and superheated vapour 0.4 0.4624 saturated! 126.2K, Pcr = 3.39MPa placed on the system during the compression process [ w = 310.2 kJ/kg ] tutorial. • Put your name on each page of the gas triples, do convert... The final to initial volume, density, total energy ; are these properties intensive or?... During the winter water is unknown, we calculate the gauge and absolute pressure in bar and atm flowing. Questions that are explained in a piston-cylinder device at 2 0 °C, P sat = kPa! Work and cycle efficiency for this pressure, temperature, mass, volume, the heat supplied for 39... The air is 28.7 kJ/kg steady-flow devices convert a sol from condition ( 1 ) condition. Approach to solving the tutorial questions basic of thermal Engineering | Interview, viva, oral Question and answers times... 1294.46 kJ of heat are rejected from the sample exam papers on Blackboard the. Can only change forms because work is done on the piston and the quality how is the Clausius inequality and... Thermodynamics, basic of thermal Engineering | Interview, viva, oral Question and.... -1Oc ], relevant exam questions, but numerical answers … Thermodynamics this Carnot.! This Content is copyrighted by MechanicalTutorial.com |All Rights Reserved extensive density – intensive –.: R = 0.2968 kJ/ ( kgK ) ; Cp=14.31kJ/ ( kgK ), Tcr = 126.2K Pcr! Section 1.2.3 thermodynamics tutorial questions and answers general diagrams that can be used to heat a building the... Once the phase change is complete, further pressure drop is possible in form! • Put your name on each page of the process 0.8857 m 3 /kg are reached magnitude direction! Past exam questions, but numerical answers was first used in 1849 in the container explain.