Mastering Bomb Calorimeters

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Questions and Answers

Which scientist is the joule (J) named after?

  • Isaac Newton
  • Michael Faraday
  • Albert Einstein
  • James Prescott Joule (correct)

What is the mechanical equivalent of heat in joules?

  • 4.186 J/kcal
  • 1 Nm
  • 2000 to 2500 kPa
  • 1 J = 1 Nm (correct)

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

  • To measure temperature changes
  • To withstand combustion pressures
  • To burn the fuel sample (correct)
  • To hold the water

What is the higher heating value of a fuel?

<p>The heat produced by the combustion of the fuel (A)</p>
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Which formula is used to determine the higher heating value (HHV) of a fuel?

<p>Both calorimetry and Dulong's formula (D)</p>
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What is the lower heating value (LHV) of a fuel?

<p>The heat energy lost up the stack due to the water vapor in the combustion gases not condensing before leaving the boiler (C)</p>
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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 (C)</p>
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Which analysis is performed on a solid fuel, such as coal, to determine the percentages of moisture, volatile matter, fixed carbon, and ash?

<p>Proximate analysis (A)</p>
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What is the formula to calculate the percentage of moisture in the original sample during the proximate analysis?

<p>(\frac{{\text{{loss of mass}}}},{{\text{{original mass}}}} \times 100%) (D)</p>
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What is the purpose of the third part of the proximate analysis procedure?

<p>To achieve complete combustion (A)</p>
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Which of the following is true about proximate analysis and ultimate analysis?

<p>Proximate analysis calculates the percentage of ash, volatile matter, and moisture, while ultimate analysis determines the elemental components of the fuel. (A)</p>
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What is the heating value of a fuel?

<p>The number of heat units liberated by the sample when burned with oxygen in a container of constant volume. (A)</p>
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Which method is used to determine the heating value of a fuel based on the ultimate analysis of the fuel?

<p>Dulongs formula (D)</p>
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What is the calorific value of a sample?

<p>The number of heat units liberated by the sample when burned with oxygen in a container of constant volume. (C)</p>
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