Usually there are a number of pre set questions taken form a larger bank 30/50 i.e. max bay sizes for light duty, general purpose plus questions relating to where check fittings should be placed etc which are not asked by someone with the technical knowledge, so remember if you are not sure ask for the question to be repeated.
There will also be general safety questions which are simple & common sense.
All questions normally relate to tube & fittings (they do for offshore)