Source: STCW Code, Part A, Chapter III – Standards Regarding Engine Department, Section A-III/1 – Mandatory minimum requirements for certification of officers in charge of an engineering watch in a manned engine-room or as designated duty engineers in a periodically unmanned engine-room.
Reference: imorules.com – Section A-III/1
Each set contains 10 different multiple-choice questions drawn from this section of the STCW Code.