Yes it will
Check the label on the projector and see what the DC input Voltage and Current requirements are so you know for sure.
It means that the transformer has the ability to provide an output of up to 12v DC @ 5 Amps to your device. Actual INPUT current is probably around 1.5 to 2 Amp at 120 VAC under a full 5 Amp DC Load.
"A inside" what? If you mean a device normally run off of a car's electrical system that you want to use indoors, then yes, as long as it draws 5A or less at 12VDC.
As long as the CB radio draws 5 amps or less @ 12 VDC, yes.
Hello Barbie, Thank you for your interest in our 5 AMP AC to DC adapter, in regards to your inquiry it would depend on how much power your Garmin device requires. As long as the device operates on 5 amps of power or less, it would work with this adapter.