Introduction to Fuel and Classification
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Questions and Answers

What is the significance of lower moisture content in coal?

  • It decreases the carbon content of coal.
  • It increases the calorific value of coal. (correct)
  • It reduces the fixed carbon content of coal.
  • It enhances the quality of ash in coal.

    • Why is the presence of nitrogen considered undesirable in coal?

  • Nitrogen has no calorific value. (correct)
  • Nitrogen contributes to the ignition temperature of coal.
  • Nitrogen causes corrosion of equipment.
  • Nitrogen has high calorific value.

    • How does the presence of high volatile matter affect the combustion of coal?

  • It causes a large proportion of matter to escape unburnt. (correct)
  • It reduces the ash content in coal.
  • It increases the calorific value of coal.
  • It improves the flow of air and heat in the furnace.

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