No. Daleks are mutants. The casing is metallic. For a while, some people thought that "Dalek" referred to the armoured casing and the creatures themselves were called "Dalek mutants". However, a)the mutants are the Daleks and b)that wouldn't have made them robots anyway.
No, they are kaled mutants that are placed in a robotic shell.
Yes. They are a type of cyborg. The result of humanoids called Kaleds being mutated by radiation. Davros removed all positive emotions from the brains and put them in machines, resulting in the Daleks.