Discussion
Assertion (A): Bleedless engine architectures reduce fuel burn.
Reason (R): Air bled from the compressor represents work already done on it that is then thrown away.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the saving. Bleed air is taken from the compressor after the engine has already done work compressing it, and that work is discarded rather than recovered by expansion through the turbine.
A bleedless architecture drives cabin compressors and anti-icing electrically instead, recovering most of the two to three per cent that bleed costs. The saving is offset by a heavier electrical system and larger generators, so the net gain depends on the aircraft and its mission.
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