Discussion
Match each offtake in List I with the service it powers in List II.
List I
A. Compressor bleed
B. Accessory gearbox
C. Fan stream
D. Core exhaust
List II
1. Electrical generators and pumps
2. Cabin pressurisation and anti-icing
3. Most of the reverse thrust on a high-bypass engine
4. The remaining share of net thrust
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-3, D-4
Each offtake is matched to what it powers. Compressor bleed (A) supplies cabin pressurisation and anti-icing (2), being hot and already at pressure. The accessory gearbox (B) drives the electrical generators and pumps (1) mechanically.
The fan stream (C) provides most of the reverse thrust on a high-bypass engine (3), since it carries most of the mass flow; and the core exhaust (D) contributes the remaining share of net thrust (4). Pneumatic, mechanical and two propulsive paths.
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