Discussion
Assertion (A): Propulsive efficiency should always be maximised regardless of other considerations.
Reason (R): It approaches unity as the jet velocity approaches the flight velocity.
Select the correct answer from the options below.
Answer: D
The reason is true but it undermines the assertion rather than supporting it. At that condition the velocity increment and therefore the thrust are zero, so a practical cycle deliberately accepts some inefficiency to produce useful thrust.
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