Which substance yields identical percentage figures in both proximate and ultimate analyses___________________?
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Answer: A. ash
Explanation
Ash is the non-combustible mineral matter remaining after complete combustion. Proximate and ultimate coal analyses both quantify this inorganic residue. Consequently, ash yields identical percentage figures in both analytical methods. Proximate analysis determines moisture, volatile matter, fixed carbon, and ash. Ultimate analysis determines elemental carbon, hydrogen, nitrogen, sulfur, and ash. Mineral matter transforms into ash oxides during high temperature burning.
Power plant operators analyze coal composition to optimize boiler performance. Coal grading standards rely on ash content percentages for commercial valuation. Environmental engineers track ash residue for solid waste management planning. Option B volatile matter varies because different methods measure different gases. Option C moisture is driven off differently in proximate versus ultimate testing. Option D hydrogen is reported as part of total elemental composition in ultimate tests.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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