Discussion
On a twin spool engine the two shafts
Answer: D
Correct answer: Find their own speeds independently
There is no mechanical connection between the two shafts - each carries its own compressor and turbine and settles at whatever speed balances its own work and satisfies flow continuity. They are coupled only aerodynamically, through the gas passing from one to the other. This freedom is the whole point of the twin spool arrangement, since it lets each spool run near its best speed over a wide range.
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