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3907
In a balloon, best fuel economy in level flight can be accomplished by
| | A) riding the haze line in a temperature inversion. |
| * | B) short blasts of heat at high frequency. |
| | C) long blasts of heat at low frequency. |
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Anonymous says: |
17 Sep 2008 |
The explanation should read: The wording of the question is misleading. As currently stated with the word 'category' being singular, the answer would be [B] because the listed classes are all in one category. If the question were stated "... which are categories of aircraft?" the correct answer would be [A] because these are all separate categories of aircraft.
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