Biomass can be converted into fuels by____________________?
Correct answer: C. both A and B
- A. direct combustion
- B. fermentation
- C. both A and B
- D. none of these
Explanation
Biomass can produce fuel by direct combustion, such as burning wood or crop waste, and by fermentation, which produces fuels such as ethanol or biogas-related products. Fermentation alone, the likely mistaken choice, ignores the direct-combustion route.
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Efficiency compares useful output energy or power with the total input, usually expressed as a percentage. The topic covers energy losses through friction, heating, resistance and sound, along with power ratings and Sankey diagrams. Efficiency is not the same as conservation of energy, because lost energy is transferred rather than destroyed.
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