ECON cruise, LR cruise...
Join Date: Apr 2002
Location: MIRSI hold - give or take...
Age: 52
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2 mix valves, one per pack. One pack typically will supply the flightdeck, with the excess air going to the mix manifold, where it is mixed with the air from the orther pack and is then routed to the cabin.
The reason option 4) is incorrect is the wording "...selected temperature in cabin and cockpit. Each mix valve modulates to maintain the temperature selected for the area it supplies, i.e. on a 73 left mix valve control F/D temperature, and right mix valve controls cabin temperature.
If the wording had been "...selected temperature in cabin or cockpit, option 4 would have been correct as well.
JAA CQB, u gotta love it!