You guys really need to read Order 8400.10 more. The Administrator may give an knowledge test as part of the 135.293, .297 and/or .299 checkride. This knowledge test may be verbal or written or any combination thereof. The the purposes of this discusion, the Administrator can be a Designated Check Airman or Inspector.
It will vary for Inspector to Inspector. Some are totally verbal. Then others will use a written test. There is no bank of questions. Safe bets for questions are, OpSpecs, GOM, FAR 91, 119, 135, Aircraft systems and limitations.
Have fun.