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| Q. |
Which among the following fuels need excess amount of air for complete combustion? |
| A. | natural fuels |
| B. | liquid fuels |
| C. | gaseous fuels |
| D. | artificial solid fuels |
| Answer» D. artificial solid fuels | |
| Explanation: artificial solid fuels need excess amount of air for complete combustion because they have low calorific value compared to liquid fuels and the rate of combustion of solid fuels cannot be easily controlled. they have tendency to form clinkers at high temperatures. | |
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