The GATE Grind

GATE 2021 ES – Question 24

Solid and Hazardous Waste Management · Municipal Solid Waste Management · 1 mark · Multiple choice

A 10 kg moisture-free sample loses6 kg when heated950°C without air, and 7 kg at the same temperature with air. Find fixed-carbon percentage.

  1. 20%
  2. 60%
  3. 10%
  4. 30%

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Show answer and explanation

Correct answer: (C) 10%

Explanation

Without air, volatile loss leaves4 kg fixed carbon plus ash. With air, combustion leaves3 kg ash. Fixed carbon is therefore4−3=1 kg out of 10 kg, or **10%,C**. The6 kg volatile fraction is not fixed carbon.

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