Discussion
Consider the following statements about emissions:
1. Nitrogen oxides peak at high power.
2. Carbon monoxide and hydrocarbons peak at idle.
3. A single operating condition minimises all of them together.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 describe the two opposing trends correctly. Statement 3 contradicts them - since nitrogen oxides rise with power while carbon monoxide and hydrocarbons fall, no single condition minimises all of them, which is why emissions are certified over a defined landing and take-off cycle rather than at one point.
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