You will always have more than one process running, if only for the kernel threads handling filesystems, networking etc., so you can only get that if you have at the very least two CPUs. And even then you usually have more processes than CPUs and the ‘application’ split up in various processes that in turn require scheduling by the kernel.
Yes, but specialized server installations where multi-core CPUs have one process sitting on one core are still "real" loads. They're just specialized and not the common case.
