I don’t like this question on EPR at constant
barometric pressure. On a modern engine the fuel control system does trim fuel
automatically to maintain selected thrust settings for changes in OAT. It can
only do that up to the engines flat rated limit about 30 degrees C, above which
thrust and EPR would reduce. Earlier engines required temperature adjustments
to be made to EPR values.
My advice for the exam would be to remember this one!
We will take it up with the exam cell.