IIRC in the Dash-8 we practiced uncommanded feather as a lead-in to engine out procedures in the sim (had happened to someone at one point). First thing you see is extremely high torque values as the prop is trying to slow down. Procudure was power lever flight idle, condition lever start/feather then fuel off if the feather worked out okay. Been a bunch of years, so could be off in my memory (FCOM is up in the attic somewhere).