BGT question

[WendyWings]

I have a question from a past BGT exam that I'd like some help with.



What will happen to the low pressure compressor if altitude is gained and constant thrust is maintained?


I would have thought that the low Px compressor would speed up in order to compensate for the decreasing air density?


Help! =)

[WendyWings]

I have another question too..


Is the air that is bled from the compressor for turbine/engine cooling taken from the Low Pressure Compressor, the High Pressure Compressor, or both?


Thanks!