WEBExplain your choice. h) The compound " A B" is a gas and the element " C" is a solid. What effect would grinding " C" into a fine powder have on the graph shown here? 4. Burning coal (Carbon) is a highly exothermic reaction. However coal, in contact with air at room temperature has such a slow reaction that it is not noticeable.
WEBYour solution's ready to go! Our expert help has broken down your problem into an easytolearn solution you can count on. Question: An ideal gas in thermal contact with the surroundings is cooled in an irreversible process at constant pressure. Are delta S, delta S surroundings, and delta S total, positive, negative, or zero?
WEBFeb 20, 2022 · Irreversible processes involve dissipative factors, such as friction and turbulence. This increases heat transfer (Q_c) to the environment and reduces the efficiency of the engine. ... a tribute to superior engineering. Electrical power stations fired by coal, oil, and natural gas have greater actual efficiencies (about 42%), because their ...
WEBJul 3, 2023 · It is used as fuel. It is a better fuel than coal because it produces more heat on burning than an equal amount of burns without producing any smoke whereas coal produces a lot of smoke on burning. Question 8 Explain the process of formation of petroleum. Answer It was formed by the decomposition of the remains of tiny plants and ...
WEBMechanical Engineering questions and answers. i) Can the entropy change of a closed system be zero during an irreversible process? Explain. ii) If a closed system experiences a net work transfer while it undergoes a reversible pro cess, does a net heat transfer from the system always also occur? If not, please provide an example when a net ...
WEBOct 19, 2023 · Coal is a black or brownishblack sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel ...
WEBexplain me the difference of reversible change and irreversible change. View Solution. Q 3. Is cutting or tearing of paper reversible or irreversible. if reversible how can we reverse it? Name the process and explain it. View Solution. Q 4. 'One way changes are classified is reversible and irreversible'.
WEBMay 13, 2023 · Recognizing that the work done in a reversible process at constant pressure is. wrev = − PΔV, we can express Equation as follows: ΔU = qrev + wrev = TΔS − PΔV. Thus the change in the internal energy of the system is related to the change in entropy, the absolute temperature, and the PV work done.
WEBProve that in regards to entropy, the integral of an irreversible process is less than that of a reversible process. True or False, A closed system can experience an increase in entropy only when a net amount of entropy is transferred into the system. The entropy .... in an irreversible cyclic process. A. remains constant B. decreases C. increases
WEBJul 8, 2017 · In this Physics video lecture in HINDI we explained how entropy changes in irreversible processes in compared to a reversible process. Entropy decreases in i...
WEBJan 6, 2020 · Environmental Impact Assessment (EIA) is a process of evaluating the likely environmental impacts of a proposed project or development, taking into account interrelated socioeconomic, cultural and humanhealth impacts, both beneficial and adverse. UNEP defines Environmental Impact Assessment (EIA) as a tool used to .
WEBStep 1. In thermodynamics, a process that cannot be precisely undone to return the system to its initial con... View the full answer Step 2. Unlock. Answer. Unlock.
WEBApr 22, 2024 · In a standard floatsink analysis, set amounts of the representative coal sample are crushed to a specified particle size and placed in liquids of known density or across a range of densities. Coal has relatively low density or specific gravity ( to ) compared to other rocks such as shale ( to ) or minerals such as pyrite ( to ).
WEBEngineering; Mechanical Engineering; Mechanical Engineering questions and answers; 2. (a) Explain the difference between a reversible and irreversible process in terms of the order of the system before and after the process and give an example of a naturally occurring irreversible event to illustrate your explanation.
WEBJan 19, 2022 · The process with timereversible history may become irreversible by a process called thermalization, which occurs when the system loses memory of its history without the necessity of energy dissipation. Quantum systems do this by losing phase coherence; for classical systems the decoherence is at zero frequency, due to loss of .
WEBOct 2, 2012 · 2 Answers. There are two parts to this answer. The first is that the entropy change is defined only for reversible processes. The second is that the entropy is a state function. Many, but not all, the functions in thermodynamics (including the internal energy) are state functions. A state function is one that is independent of path.
WEBJun 14, 2021 · Also, once the curd is formed, it cannot be reversed back into milk. So, there is a formation of new substance with different properties and also it is an irreversible process. Hence, setting of curd is a chemical change. Question 7. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes ...
WEBAug 24, 2019 · The irreversible adiabatic process is carried out similar to irreversible isothermal process by halving the pressure and allowing the gas to expand at constant external pressure. When the process reaches the same volume as the reversible process, state 2, the gas is not yet in equilibrium as its internal pressure is still greater than the ...
WEBWhen examining thermodynamic processes some simplifying assumptions may be applied to help describe and analyse a given system. These simplifiions can be viewed as 'ideal' thermodynamic processes and include adiabatic, isenthalpic, isentropic, isobaric, isochoric, isothermal, isentropic, polytropic and reversible processes. This article provides a brief .
WEBReversible process and consequently reversible cycle is an ideal one. There are no losses in the form of friction, temperature differences for heat transfer to take place. Presence of fraction makes the process mechanically irreversible and the temperature difference for heat transfer during the process makes the process thermally irreversible.
WEBScientists. Other. Category. v. t. e. In thermodynamics, a reversible process is a process, involving a system and its surroundings, whose direction can be reversed by infinitesimal changes in some properties of the surroundings, such as pressure or temperature. [1] [2] [3] Throughout an entire reversible process, the system is in thermodynamic ...
WEB5 days ago · The process of making curd from milk is actually simple. It requires the following steps: * First, the milk is heated to boil for a few minutes. In this process, the extra water present in the milk gets evaporated and the milk gets thickened a bit. * Then, the milk is allowed to cool to the room temperature. * Then one spoon of curd is added to ...
WEBThe process is repeated thereafter. The efficiency of carnot engine, eta is given by eta = dfrac{Q_1 Q_2}{Q_1 ... View Solution. Q2. Explain reversible and irreversible process. Describe the working of Carnot Engine. Obtain an expression for its efficiency. View Solution. Q3. A Carnot engine works between ice point and steam point ...
WEBAug 3, 2019 · 2. A generic process is defined reversible if with its reverse is possible to come back to the orginal thermodynamic states both for the system and for its enviroment. You consider a room divided into two parts, with the gas in the initial state confined in one of the two part. At a certain instant the gas flows through a hole into the second ...
WEBFigure Quasistatic and nonquasistatic processes between states A and B of a gas. In a quasistatic process, the path of the process between A and B can be drawn in a state diagram since all the states that the system goes through are known. In a nonquasistatic process, the states between A and B are not known, and hence no path can be drawn. .
WEBMechanical Engineering. Mechanical Engineering questions and answers. 8. To determine the entropy change for an irreversible process between states 1 and 2, should the integral be performed along the actual process path or an imaginary reversible path? Explain. Is it possible to create entrony2 Is it possible to destroy it2.
WEBMay 14, 2018 · 1. For an irreversible expansion process, a crude approximation to the force exerted by the gas on the piston (where the work is done) can be provided by the equation. F A = Pext = nRT V − k V dV dt F A = P e x t = n R T V − k V d V d t. where Pext P e x t is the force per unit area of the piston on the gas and the constant k is ...
WEBNov 19, 2020 · For an irreversible adiabatic process entropy is generated within the system resulting in an increase in the entropy of the system only. An example of an irreversible adiabatic process is the rapid expansion or compression of a gas by a piston in an insulated cylinder such that the gas is not in internal equilibrium during the process.
WEBJul 6, 2020 · The reason why more work is done in a reversible process than an irreversible process is in an irreversible process entropy is generated within the gas whereas in a reversible process entropy is not generated. That additional entropy has to be transferred to the surroundings in the form of heat, leaving less heat available to be .
WEBDefine entropy and calculate the increase of entropy in a system with reversible and irreversible processes. Explain the expected fate of the universe in entropic terms. ... Figure (a) Heat transfer from a hot object to a cold one is an irreversible process that produces an overall increase in entropy. (b) The same final state and, thus ...
WEBDestructive Distillation is a chemical process used to decompose unprocessed materials. It is done by heating the unprocessed material leading to a relatively large amount of 'cracks'. It is the treatment of certain organic substances with a fixed amount of oxygen. It is useful in producing a variety of products, including ethanol, methanol ...
WEBCalculate a change in entropy for an irreversible process of a system and contrast with the change in entropy of the universe; Explain the third law of thermodynamics; ... A coal power plant consumes 100,000 kg of coal per hour and produces 500 MW of power. If the heat of combustion of coal is 30 MJ/kg, what is the efficiency of the power plant?
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