Can one activate trap cards during the same turn they were set on the field.?

sage is correct. also in terms of traps, you are allowed to activate your trap cards after the turn you set them. if an example helps, then let's say i set Call of the Haunted and have a Blue-Eyes White Dragon in the graveyard. i then end my turn for my opponent to have a turn, which means i can now activate Call of the Haunted pretty much whenever I want