1.
Does the efficiency of a jet engine change with altitude since the density varies?
Yes
Can't be determined
No
Does the efficiency of a jet engine change with altitude since the density varies?
Yes
Can't be determined
No
Yes
Can't be determined
No
Solution
Increased
Increasing altitude (decreasing air density) increases the range up to an optimum altitude,
and then decreases again. The range is increased with altitude because of increased jet
engine efficiency. However, above the optimum altitude, the effects of air compressibility
cause the drag to increase resulting with reduced specific range.