What is an inflow of a shaft??

I,m going for a job interview and i have a list of typical questions that are asked and one is what is an inflow on a shaft, it was asked before during previous interviews with some guys i know and they couldn't answer it, any thoughts?
the interview is for maintenance in a large boi research pharmaceutical plant.The questions have been devised by the HR dept. of the company and are supposed to be general maintenance related, but i don,t think the questions have been vetted by the Eng. dept. as they are pretty obscure questions and this one being the worst

Answers:
Is that shaft as in penis or shaft as in drive shaft or shaft as in mine shaft?

I would guess at the latter due to the relation with inflow, since this suggests a flow of fluid. What relation this has to do with pharmaceutical research I do not know.
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