Mastering Bomb Calorimeters

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Questions and Answers

Which analysis is performed on a solid fuel, such as coal, to determine the percentages of moisture, volatile matter, fixed carbon, and ash?

  • Combustion analysis
  • Proximate analysis (correct)
  • Ultimate analysis
  • Calorimetry

What is the percentage of moisture in the original sample determined in part one of the proximate analysis?

  • The total loss of mass
  • The difference between the loss of mass and the percentage of volatile matter
  • The percentage of volatile matter in the original sample
  • The loss of mass divided by the original mass (correct)

What is the percentage of volatile matter in the original sample determined in part two of the proximate analysis?

  • The difference between the loss of mass and the percentage of moisture (correct)
  • The percentage of moisture plus volatile matter
  • The total loss of mass
  • The loss of mass divided by the original mass

Which analysis uses chemical methods to determine the elemental components of a fuel, including carbon, nitrogen, oxygen, hydrogen, and sulfur?

<p>Ultimate analysis (C)</p> Signup and view all the answers

What is the calorific value (heat of combustion) of a sample?

<p>The number of heat units released by the sample when burned with oxygen (C)</p> Signup and view all the answers

What are the units used to express the heating value of solid and liquid fuels?

<p>kj/kg (A)</p> Signup and view all the answers

What is the difference between proximate analysis and ultimate analysis?

<p>Proximate analysis determines the moisture content of a fuel, while ultimate analysis determines the elemental components. (D)</p> Signup and view all the answers

Which term is used to refer to the total heat energy released by complete combustion of a unit quantity of fuel?

<p>Higher heating value (D)</p> Signup and view all the answers

What does the lower heating value (LHV) represent?

<p>The heat energy released by complete combustion of a unit quantity of fuel, minus the latent heat of evaporation of water vapor (D)</p> Signup and view all the answers

What is the reduction in heating value (HHV minus LHV) equal to?

<p>The total mass of water vapor per kilogram of fuel multiplied by the latent heat of evaporation (D)</p> Signup and view all the answers

Which physicist is the joule unit named after?

<p>James Prescott Joule (B)</p> Signup and view all the answers

What is the mechanical equivalent of heat?

<p>4.186 kJ/kcal (D)</p> Signup and view all the answers

What is the purpose of the insulating jacket in a bomb calorimeter?

<p>To control heat transfer between the bucket and the surroundings (C)</p> Signup and view all the answers

What is the formula used to calculate the higher heating value of a fuel in a bomb calorimeter?

<p>$ ext{Higher heating value} = rac{ ext{Heat produced by combustion}}{ ext{Mass of fuel}}$ (B)</p> Signup and view all the answers

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