The engine described is best categorized as having which bypass characteristic?

• A. High Bypass
• B. Medium Bypass
• C. Low Bypass
• D. No Bypass

Answer: (A)

Bypass ratio measures how much air is diverted around the engine core versus going through it. A high bypass means most of the intake air passes through a large bypass duct around the core, while only a small portion goes through the core itself. This creates thrust mainly from the accelerated bypass air and yields lower exhaust velocity, which improves propulsive efficiency, reduces noise, and typically lowers fuel burn at subsonic speeds. If the engine described has a large fan and a substantial amount of air flowing around the core (rather than through it), that indicates a high bypass design. Medium and low bypass configurations have progressively less air bypassing the core and higher core flow, while no bypass corresponds to a turbojet with essentially all air going through the core.