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Use a steel beam.. That would be code.. steel w10x15 (50ksi) I beam.
That depends on what it is carrying. . .you definitely need to consult a structural engineer for this information, and having the original set of plans to show him will help. FYI. . .28 feet is a VERY long clear-span for any type of beam.
An inverted beam is a beam whose bottom is the same as the slab. A drop beam is a beam that is put under the structural member it supports.
cantilever beam,contineous beam,fixed beam,simply supported beam
Beam classifying