Final answer:
Gas turbines, spacecraft rock-breaking machinery, railway track, and military helmets are some major modes of RT equipment.
Step-by-step explanation:
Some major modes of RT (Radiographic Testing) equipment include gas turbines, spacecraft rock-breaking machinery, some railway track (e.g. points), and military helmets. Gas turbines, for example, use RT equipment to inspect the internal components for any defects or damage. Similarly, spacecraft rock-breaking machinery and railway track undergo RT inspection to ensure their structural integrity. Military helmets are also examined using RT equipment to identify any hidden defects or weak areas that may compromise the helmet's protective capabilities.