# Second law of thermodynamics questions and answers pdf

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## 4.A: The Second Law of Thermodynamics (Answer)

When heat flows from the reservoir to the ice, the internal mainly kinetic energy of the ice goes up, resulting in a higher average speed and thus an average greater position variance of the molecules in the ice.

The reservoir does become more ordered, but due to its much larger amount of molecules, it does not offset the change in entropy in the system. Some possible solutions are frictionless movement; restrained compression or expansion; energy transfer as heat due to infinitesimal temperature nonuniformity; electric current flow through a zero resistance; restrained chemical reaction; and mixing of two samples of the same substance at the same state. The temperature increases since the heat output behind the refrigerator is greater than the cooling from the inside of the refrigerator.

Heat pumps can efficiently extract heat from the ground to heat on cooler days or pull heat out of the house on warmer days. The disadvantage of heat pumps are that they are more costly than alternatives, require maintenance, and will not work efficiently when temperature differences between the inside and outside are very large.

Electric heating is much cheaper to purchase than a heat pump; however, it may be more costly to run depending on the electric rates and amount of usage. A nuclear reactor needs to have a lower temperature to operate, so its efficiency will not be as great as a fossil-fuel plant. This argument does not take into consideration the amount of energy per reaction: Nuclear power has a far greater energy output than fossil fuels.

In order to increase the efficiency, the temperature of the hot reservoir should be raised, and the cold reservoir should be lowered as much as possible.

This can be seen in Equation 4. Entropy will not change if it is a reversible transition but will change if the process is irreversible. Entropy is a function of disorder, so all the answers apply here as well. Samuel J. Check Your Understanding 4. Conceptual Questions 1. Problems Additional Problems Challenge Problems Contributors and Attributions Samuel J.

## 300 TOP MOST Thermodynamics – Mechanical Engineering Multiple choice Questions and Answers

Mcq on convection heat transfer objectives questions December 19, In this mechanical engineering lecture today we learned about heat transfer subjects Mcq on convection heat transfer objectives questions Third law of thermodynamics. Heat of combustion of methane and ethane are A pinoybix mcq, quiz and reviewers. Thermodynamics is a branch of Physics that helps in understanding heat and temperature and their relation with work, energy, radiation, and other properties of matter. The temperature of the calorimeter was found to increase from According to Kelvin plank statement No; Answer: A.

The students those are preparing for the Govt. Which of the following variables controls the physical properties of a perfect gas. Which of the following laws is applicable for the behavior of a perfect gas. According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as. An ideal gas as compared to a real gas at very high pressure occupies.

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. 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? 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.

## Second Law of Thermodynamics - Mechanical Engineering (MCQ) questions and answers

Problem sets First Law of Thermodynamics One of the trusted Educational Blog. The section contains questions and answers on second law of thermodynamics, cyclic heat engine, kelvin planck statement, refrigerator and heat pump, carnot theorem, absolute temperature scales and clausius theorem. Below article will solve this puzzle of yours.

When heat flows from the reservoir to the ice, the internal mainly kinetic energy of the ice goes up, resulting in a higher average speed and thus an average greater position variance of the molecules in the ice. The reservoir does become more ordered, but due to its much larger amount of molecules, it does not offset the change in entropy in the system. Some possible solutions are frictionless movement; restrained compression or expansion; energy transfer as heat due to infinitesimal temperature nonuniformity; electric current flow through a zero resistance; restrained chemical reaction; and mixing of two samples of the same substance at the same state. The temperature increases since the heat output behind the refrigerator is greater than the cooling from the inside of the refrigerator.

Which of the following variables controls the physical properties of a perfect gas a pressure b temperature c volume d all of the above e atomic mass.

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• Second Law of Thermodynamics Questions and Answers. Test your understanding with practice problems and step-by-step solutions. Browse through all study. Agramant D. - 25.05.2021 at 07:50
• This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Second Law of Thermodynamics”. 1. Heat is transferred to a heat engine. Aurore G. - 29.05.2021 at 16:49
• Physics Class 11 Important Questions are very helpful to score high marks in board exams. Benicio M. - 02.06.2021 at 09:51