Multiple-choice questions. Pick the best answer from the list of possible answer
ID: 1841844 • Letter: M
Question
Multiple-choice questions. Pick the best answer from the list of possible answers provided for each question. Which of the following is not an appropriate strategy to reduce nitric oxide emissions? increase the temperature; bum fuel rich; reduce oxygen availability A mixture fraction is useful to describe which class of flames? premixed flames; nonpremixed flames The assumption of infinitely fast chemistry is useful to describe which class of flames? premixed flames; nonpremixed flames Which two pollutants are most relevant in photochemical smog formation? NOx and unbumed hydrocarbons; particulate matter and CO; NOx and CO The production of which pollutant does not tend to increase as the equivalence ratio increases to values greater than unity? NOx; unburned hydrocarbons; CO; particulate matterExplanation / Answer
a. When the organic fuels are burnt (basically for power generation in marine and auto industry) at high combustion temperatures, the oxygen has more tendency to react with the nitrogen in air resulting in nitrous oxide emissions. The above tendency increases with increasing temperature, so an increase in temperature would not be an appropriate strategy to reduce nitrous oxide emissions.
b.The definition of mixture fraction is basically discussed under a non-premixed flames and one such example is diesel internal combustion engines.
c. Photochemical smog formation occurs when pollutants from the combustion of fossil fuels react with sunlight. And the main pollutants responsible are Nitrous oxide and volatile organic compounds such as unburned hydrocarbons.
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