separator of light liquids(A mechanical device for separating and removing residues from fuel and lubricating oil from waste water coming from filling stations and industrial plants in order to avoid pollution of water bodies; this system is based on the different specific weights of water and fuel residues that float on the water and can be easily removed)
competitive examination(A test given to a candidate for a certificate or a position and concerned typically with problems to be solved, skills to be demonstrated, or tasks to be performed)