Thermodynamics Second Law of Thermodynamics 1. According to Kelvin-Plancks statement of second law of thermodynamics a It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work b It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert the heat energy into work c It is impossible to construct a device which while working in a cyclic process produces no ef f ect other than the transf er of heat f rom a colder body to a hotter body d When two dissimilar metals are heated at one end and cooled at the other, the e.

T he property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner is known as a enthalpy b internal energy c entropy d external energy.

T he entropy may be expressed as a f unction of a pressure and temperature b temperature and volume c heat and work d all of the above e none of the above.

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T he change of entropy, when heat is absorbed by the gas is a positive b negative c positive or negative. Which of the f ollowing statements is correct?

### Thermodynamics questions

T he condition f or the reversibility of a cycle is a the pressure and temperature of working substance must not dif f er, appreciably f rom those of the surroundings at any stage in the process b all the processes taking place in the cycle of operation, must be extremely slow c the working parts of the engine must be f riction f ree d there should be no loss of energy during the cycle of operation e all of the above.

In an irreversible process there is a a loss of heat b no loss of work. T he main cause f or the irreversibility is a mechanical and f luid f riction b unrestricted expansion c heat transf er with a f inite temperature dif f erence d all of the above. T he ef f iciency of the Carnot cycle may be increased by a increasing the highest temperature b decreasing the highest temperature c increasing the lowest temperature d decreasing the lowest temperature e keeping the lowest temperature constant.

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The topics that are covered in this PDF containing Thermodynamics Previous Year GATE Solved Questions are: Thermodynamic systems and processes; properties of pure substances, behaviour of ideal and real gases; zeroth and first laws of thermodynamics, calculation of work and heat in various processes; second law of thermodynamics; thermodynamic property charts and tables, availability and irreversibility; thermodynamic relations.

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Related Content Feed:. Latest posts N.Increases, entropy decreases.

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Engine specifications are different in different manufactures like as Bore Diameter CCIgnition timing. Also the exhaust passage takes more responsible for sound. Octane No. It is the measure of rating of SI engine. Cetane No. It is the measure of rating of CI engine. Divide the shaft diameter size by 5, it will give last two digit of the bearing no. When a material is compressed in one direction, it usuallytends to expand in the other two directions perpendicular tothe direction of compression.

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This phenomenon is called thePoisson effect. For most of the engineering purposes, heat capacities may be assumed numerically equal to specific heat values.

For an aqueous solution of salts, the specific heat can be estimated by assuming the specific heat of the solution equal to that of the water alone. Give examples of latent heats.

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For pure substances, the heat effects accompanying changes in state at constant pressure no temperature change being evident are known as latent heats.

Examples of latent heats are the heat of fusion, vaporization, sublimation and change in crystal form. What is their significance and importance? Gibbs function is of particular importance in processes where chemical changes occur. For reversible isothermal steady-flow processes or for reversible constant-pressure isothermal nonflow processes, change in free energy is equal to network.

Isothermal process. Volume remains constant. Throttling process. All the mechanical engineering systems are studied with the help of thermodynamics. Hence it is very important for the mechanical engineers. There are three laws of the thermodynamics:. It can only be transformed from one form to another. Is the boiler a closed system?Are you chemical, mechanical, electrical engineering graduate? Do you have sound knowledge on concepts of physics? Do you have strong background in thermodynamics and heat transfer?

Thermodynamics is a branch of physics concerned with heat and temperature and their relation to energy and work.

It deals with the transfer of energy from one place to another and from one form to another. A thermodynamic engineer should have chemistry knowledge, problem solving mathematics proficiency, physics knowledge, and mechanical aptitude. So, track your future as thermodynamic engineer, remote monitoring engineer, assistant professors, visiting faculty and many more by going through the thermodynamics job interview questions and answers given below which will make you succeed in your interview.

Question 1. Give Its Limitations And Importance.? Answer : The third law of thermodynamics states that:.

Limitations: If any disorder like impurity or imperfection is found in a substance then the entropy of such crystal is non-zero at 0 K. For example: The entropy of pure carbon dioxide and nitric oxide is zero at 0K.

Second Law of Thermodynamics GATE Questions - Lecture on 2nd Law, Heat Engine, Refrigeration Problem

This shows that there exists disorder in the arrangement of such molecules. This law is applicable only to pure compounds. Thus we can say that, this law is not applicable to glass which is a supercooled liquid. It is also not applicable to amorphous substance and supercooled solutions. Question 2. Explain The Laws Of Thermodynamics.?

Answer : Zeroth law: If any two systems are in thermal equilibrium with the third system, then they are also in thermal equilibrium with each other. First law: First law of thermodynamic states that energy can neither be created nor be destroyed but it can only be converted from one form to another.

Question 3. Answer : Isolated system: A system that can neither exchange matter nor heat with the surrounding is known as an isolated system. For example: Water placed in a vessel that is closed as well as insulated. Open system: A system that can exchange both matter and energy with the surrounding is said to be an open system.

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For example: A reaction taking place in an open vessel exchanges both energy and matter with the surrounding. Closed system: A system that exchanges only energy and not matter with the surrounding is said to be a closed system. For example: A reaction taking place in a closed metallic vessel.All the commercial liquid fuels are derived from natural petroleum or crude oil.

A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as. The efficiency and work ratio of a simple gas turbine cycle are. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called.

There is a loss of heat in an irreversible process. An adiabatic process is one in which. Which of the following represents Otto cycle on temperature — entropy T — s diagram?

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When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas. Which of the following is the lightest and most volatile liquid fuel? The processes occuring in open system which permit the transfer of mass to and from the system, are known as.

## Mcq-thermodynamics Second Law of Thermodynamics

Which of the following has the minimum atomic mass? Workdone in a free expansion process is. The compression ratio for petrol engines is. The most probable velocity of the gas molecules is given by. The efficiency of Diesel cycle approaches to Otto cycle efficiency when. The atomic mass of oxygen is. The ratio of specific heat at constant pressure Cp and specific heat at constant volume cv is. Prepare these Thermal MCQ to crack the competitive exam.

This is one of the essential branches of physics. It explores the connection between vital aspects of our everyday lives. These are a couple of sample questions: Thermodynamics studies the relationships between heat, temperature and?

Find out all the right answers and prove to everyone you know everything about this. Hey there Science Geeks! Hope you all are well. So, here's the quiz on Heating and Cooling.

Heating and Cooling are the two essential phenomena which are useful in all machines, industrial works, factories, environment, Sample Question. Thermodynamics is a branch of science which primarily focuses on the relations between heat and various other forms of energy, such as mechanical, chemical or electrical energy, and therefore the relationships between all forms Welcome to our first Calorimetry and Thermal Analysis Quiz.

We have designed this quiz just for some fun, and it contains some easy questions, some tough questions and of course some trick Thomas Edison — Thomas Johann Seebeck — Albert Einstein — Thermodynamics II. This quiz item is intended for students under the Tutorial Class.

Its objectives is to determine their basic understanding and knowledge on thermodynamic laws and processes. Questions on heat and thermodynamics for Principles of Engineering.

Temperature Quizzes. Energy Quizzes. Engineering Quizzes. Momentum Quizzes. The total energy of the universe is constant. Disorder in the universe is increasing with the passage of The second law of thermodynamics asserts that for a thermodynamically defined process actually to transpire, the amount of the entropies of the participating bodies must increase. In an idealized limiting case, that of a reversible process, this sum. Which of the below is not a type of heat transfer? How many water molecules per metal sulphate MeSO4 molecule are lost by the sample in the tested temperature range?

In other words, what is the value of x in the reaction below? Is melting an endothermic reaction? Meltingice isendothermic-- you can see this by putting a thermometer in a glass of warm water, adding an ice cube, and watching the temperature go down as the icemelts.

It only takes a minute to sign up. I'm a high school rookie learning thermodynamics right now by myself. I got really confused that the second law of thermodynamics states that the entropy of the universe is always increasing.

If the entropy is not positive, the process is taking place spontaneously. But when I look at the AP reference book, which says if the entropy of a reaction is negative, it's taking place in the opposite direction spontaneously, I got confused. Is it a hypothetical process? Can the entropy be negative and still happen in the opposite direction?

Or does it require work? Let's call this the total entropy. Well, almost true, since the entropy of the universe remains constant for a reversible process.

When a hot stone is dropped in cold water, it's entropy decreases it gets colderbut the water increases it's entropy at the same time it receives heat and gets slightly warmer. At any times, when an entropy decrease is happening, an entropy increase is happening somewhere else. The funky thing is that this entropy increase always is numerically larger than the decrease. If anyone says entropy decrease it is because they are not talking about the whole system. So there must be a change in entropy.

That this change is positive is clear if we write them out and solve the integrals:. So this is a small proof that heat transfer is an example of an irreversible process that will cause the total entropy to increase. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 5 years, 5 months ago.

Active 5 years, 5 months ago. Viewed 1k times. It's not the entropy of the reaction that matters, it's another thing entirely called Gibbs free energy that includes entropy. See maxpesa's answer.

Active Oldest Votes. Steeven Steeven Those are just words, or labels if you will, that we use to distinguish two things. In your case you will focus on the stone. Everything else would then be "the surroundings".

Reversing them is nothing more than a wording change; they changes none of the physics. If you are talking about chemical reactions, you should consider this.