Introduction to Thermodynamics Quiz
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Questions and Answers

What does the Zeroth Law of Thermodynamics state regarding bodies in thermal equilibrium?

  • They are in equilibrium with each other. (correct)
  • They have varying temperatures.
  • They cannot have the same temperature.
  • They are only in equilibrium if they have the same mass.

    • According to classical mechanics, how does mass behave with respect to velocity?

  • Mass decreases with increasing velocity.
  • Mass increases with increasing velocity.
  • Mass remains constant regardless of velocity. (correct)
  • Mass fluctuates depending on temperature.

    • Which unit corresponds to force in the context of physics as indicated?

  • 1 N (correct)
  • 1 kg
  • 1 lb f
  • 1 slug

    • What implication does the Zeroth Law have on temperature measurement?

    <p>Thermal equilibrium determines the measurement of temperature.</p> Signup and view all the answers

    What characteristic does an isolated system have?

    <p>It does not exchange heat, matter, or work with the environment.</p> Signup and view all the answers

    What does the gravitational constant refer to in the context provided?

    <p>The acceleration due to gravity.</p> Signup and view all the answers

    Which of the following properties is considered an extensive property?

    <p>Mass</p> Signup and view all the answers

    Which of the following is an example of an intensive property?

    <p>Specific Gravity</p> Signup and view all the answers

    How is temperature defined in terms of thermodynamic substances?

    <p>It measures the hotness and coldness of a body.</p> Signup and view all the answers

    Which of the following pairs is correctly classified as an extensive property?

    <p>Volume - Weight</p> Signup and view all the answers

    What does the term 'intensive property' refer to?

    <p>A property that is independent of the mass of the substance.</p> Signup and view all the answers

    What is the formula for force according to the content?

    <p>Force = Mass x g (acceleration due to gravity)</p> Signup and view all the answers

    Which of these examples correctly illustrates an isolated system?

    <p>A thermos that does not allow heat exchange</p> Signup and view all the answers

    What is the primary function of a pulverizer in a coal-fired thermal plant?

    <p>To increase combustion efficiency of coal</p> Signup and view all the answers

    What is the main purpose of the economizer in a coal-fired thermal plant?

    <p>To reduce energy consumption, such as preheating water</p> Signup and view all the answers

    Considering the ultimate analysis of coal, which element contributes the most to the total mass?

    <p>Carbon</p> Signup and view all the answers

    What is the purpose of a superheater in a coal-fired thermal plant?

    <p>To condition and heat the steam beyond saturated temperature</p> Signup and view all the answers

    How much air is required for the combustion of coal if 25% excess air is used?

    <p>More than the stoichiometric amount needed</p> Signup and view all the answers

    In the presence of ash, what is its importance in the mass balance during combustion?

    <p>It is neglected in calculations due to its non-combustible nature</p> Signup and view all the answers

    What does the apparent gas constant of product gas depend on?

    <p>The molecular weight of the produced flue gases</p> Signup and view all the answers

    What is a common method for removing air from the feedwater in a coal-fired boiler?

    <p>Using a deaerator</p> Signup and view all the answers

    What is the primary advantage of vacuum distillation?

    <p>It reduces the boiling point by lowering the pressure.</p> Signup and view all the answers

    What is cracking primarily used for in hydrocarbon processing?

    <p>To break up large hydrocarbon molecules into smaller ones.</p> Signup and view all the answers

    Which component is NOT typically found in biogas?

    <p>Hydrogen</p> Signup and view all the answers

    What characterizes dry natural gas compared to wet natural gas?

    <p>It consists of almost complete methane.</p> Signup and view all the answers

    Which gas is primarily produced through gasification in gasworks?

    <p>Producer Gas</p> Signup and view all the answers

    How does natural gas primarily form?

    <p>From decomposing plants and animal matter buried in sedimentary rocks.</p> Signup and view all the answers

    What is the main composition of liquefied petroleum gas (LPG)?

    <p>Hydrocarbons containing three or four carbon atoms.</p> Signup and view all the answers

    What distinguishes wet natural gas from dry natural gas?

    <p>Wet natural gas contains less than 85% methane.</p> Signup and view all the answers

    What is the main characteristic of an open system?

    <p>It exchanges both energy and matter with the environment.</p> Signup and view all the answers

    Which of the following is an example of a closed system?

    <p>A piston cylinder assembly</p> Signup and view all the answers

    Which type of system allows the passage of energy but not matter?

    <p>Closed System</p> Signup and view all the answers

    What defines a system as isolated?

    <p>It does not exchange energy or matter with the environment.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of matter?

    <p>It can exist in only one state.</p> Signup and view all the answers

    Which of the following best describes the surroundings in relation to a system?

    <p>Everything outside the system's boundary.</p> Signup and view all the answers

    In what type of system would you find the air in a balloon?

    <p>Closed System</p> Signup and view all the answers

    What is an example of an open system?

    <p>A steam turbine.</p> Signup and view all the answers

    Study Notes

    Introduction to Thermodynamics

    • Energy exists in many forms: mechanical, electrical, chemical, and more.
    • Thermodynamics focuses on how energy changes forms and its relationship with surrounding areas.

    Types of Systems

    • Open System: Exchanges both energy (heat, work) and matter with the environment.
      • Examples: Pumps, turbines, air conditioners, hair dryers.
    • Closed System: Exchanges energy (heat, work) but not matter with the environment.
      • Examples: Piston-cylinder assembly, air in a balloon, mercury in a thermometer, pressure cookers.
    • Isolated System: Does not exchange heat, matter, or work with the environment.
      • Examples: Thermos, picnic ice chest.

    Thermodynamic Properties

    • Matter: Anything that occupies space and has mass or weight. It exists as solids, liquids, and gases.
    • Extensive Property: Dependent on the substance's mass.
      • Examples: Mass, weight, volume, energy.
    • Intensive Property: Independent of the substance's mass.
      • Examples: Density, pressure, temperature, specific volume, specific weight, specific gravity, specific internal energy.

    Temperature

    • Measures a body's hotness and coldness.
    • Common temperature scales: Kelvin (K), Celsius (°C), Rankine (R), Fahrenheit (°F).

    Zeroth Law of Thermodynamics

    • States that when bodies are in thermal equilibrium with a third body, they are in thermal equilibrium with each other, meaning they are at the same temperature.

    Vacuum Distillation

    • Distillation performed at lower than atmospheric pressure.
    • This lowers the boiling point of liquids.
    • Used in refining processes to separate petroleum products.

    Cracking

    • Process to break large hydrocarbons into smaller, more useful components.
    • Achieved using high temperatures and pressures or lower temperatures and pressures with catalysts.
    • Used in refining and fuel production.

    Gaseous Fuels

    • Manufactured Fuel Gas: Produced through gasification, typically at gasworks.
      • Biogas: Renewable energy source, a mixture of methane and carbon dioxide.
      • Producer Gas: Combustible mixture of nitrogen, CO2, CO, and hydrogen.
    • Petroleum Gas (LPG): Non-renewable energy source, mainly hydrocarbons with 3 or 4 carbon atoms.
    • Natural Gas: Non-renewable, mixture of hydrocarbons formed over millions of years from decomposing organic matter.
      • Primarily methane, cleanest burning fossil fuel.
      • Migrates through sedimentary rocks and can seep out of the ground.

    Composition of Natural Gas

    • Dry Natural Gas: Almost entirely methane.
    • Wet Natural Gas: Contains liquefiable hydrocarbons (ethane, butane) in addition to methane.

    Coal Combustion

    • Ultimate Analysis: Determines percentages of carbon, hydrogen, oxygen, nitrogen, sulfur, and ash in coal.
    • HHV (Higher Heating Value): Energy released from combustion of 1 kg of fuel.

    Sample Problem: Coal Combustion

    • Illustrates how to calculate air required, flue gas composition, gas constant, and minimum temperature to prevent condensation of liquid in the chimney.

    Typical Coal Fired Thermal Plant

    • Consists of several components:
      • Coal Conveyor: Efficiently moves coal.
      • Pulverizer: Enhances combustion efficiency.
      • Boiler: Generates steam by heating water.
      • Superheater: Heats steam after it is conditioned.
      • Economizer: Reduces energy consumption by preheating fluids.
      • Reheater: Reheat steam for added efficiency.
      • Steam Turbine: Converts thermal energy from steam into rotary motion.
      • Generator: Converts mechanical energy into electrical energy.
      • Condenser: Condenses steam back to water by cooling it.
      • Deaerator: Removes air and dissolved gases from feedwater.

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    Description

    Test your understanding of thermodynamics concepts, including energy forms, system types, and thermodynamic properties. This quiz covers essential definitions and examples that illustrate the principles of energy exchange and transformation.

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