You should know this stuff if you're applying for the position. Chromatography separates the sample into it's components based on some property like polarity, size, or chirality of the components. Mass Spec energizes the eluting compounds through electron impact at 70eV, and those compounds will fragment upon relaxation, and each of those fragments has a mass and a charge associated with it, the spectrum of fragments based on the ratio of mass to charge is analyzed by comparing relative abundance of each fragment size.