A function key is a key on a computer or terminal keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions, a form of soft key. On some keyboards/computers, function keys may have default actions, accessible on power-on.
Surge definition, a strong, wavelike, forward movement, rush, or sweep: the onward surge of an angry mob. See more.
Quick Answer. Compressor surge occurs when the pressure of air delivered by the compressor is higher than the pressure that the compressor can maintain. A turbocharger is a centrifugal compressor that increases air flow, which produces more horsepower.