Properly grounded means that all metallic parts of equipment capable of carrying current, in a short circuit condition, will have the same or be at the same potential as that of the service ground.
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Not correctly , It will show on a tester that it is grounded but you should run a separate ground for it to be properly grounded
It means the neutral is not grounded.
It may or may not be grounded, depending on the intended purpose.
With a common emitter amplifier it's the emitter that is usually grounded.
It is best to use both, then usually grounded, then double insulated is just OK.