Sln-Quiz#1

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Stevens Institute Of Technology *

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234

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Mechanical Engineering

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Oct 30, 2023

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pdf

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1 Quiz #1 ENGR 234 - Thermodynamics Name:………………….. 1. True or False: - Body Organs, such as the human heart, whose shapes change as they perform their normal functions can be studies as open systems. True - A Mixture of liquid water and water vapor (with no air) in equilibrium at 1 atm pressure (100 ℃ ) is called the ice point. False – Mixture of liquid and vapor water is called steam point. - The second law of thermodynamics indicate that actual processes occur in the direction of increasing quality of energy. False – Actual processes occur in the direction of decreasing quality of energy - If the value of any property of a system changes with time, that system is at steady state. False – Steady state means NO change with time. - Everything external to the system is called “boundary”. False – It’s called surrounding. - A “state” is the condition of a system by its properties. True - A “process” is a transformation from one state to another. True 2. Which units belong to what standards: Meter, feet, Rankine, Kelvin, Slug, Kilogram SI English Meter Feet Kelvin Rankine Kilogram Slug 3. The pressure of a fluid at rest increases with depth except for: a. Water b. Mercury c. Air d. Oil Answer Key

2 4. Fill in the blank: - … Temperature ….. is the property that is same for each of two systems when they are in thermal equilibrium - A process during which the pressure P remains constant is called …… Isobaric ……. . - Rounding 7658.32 m to three significant figures result is …… 7.66 km …… In this class, we use scientific notations for trailing zeros to avoid any ambiguity (Regardless of “7660” or “7660.”) For SI units, we convert the scientific notations to prefixes provided on page 10 of Chapter 1 lecture notes. For 7660 m to be a correct answer, you need to write down 766 × 10 ! m Also, if a number comes with a unit, the final rounded answer needs to have the unit. So, for your exams and homework, when rounding the final answer to three significant figures, please don’t forget to include the unit . 5. Put the laws of thermodynamics definition mentioned below [“zeroth, “first’, and “second”] in order: “It asserts that energy has quality as well as quantity”. “If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other.” “Energy cannot be created nor destroyed, it only changes forms from one form to another”. Zeroth Law: “If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other.” First Law: “Energy cannot be created nor destroyed, it only changes forms from one form to another”. Second Law: “It asserts that energy has quality as well as quantity”.

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