Final answer:
Excessive superheat is an indicator of a leak in a high pressure system because the refrigerant absorbs more heat due to reduced pressure from the leak, leading to higher superheat levels.
Step-by-step explanation:
An indicator of a leak in a high pressure system is excessive superheat (Answer C). This occurs because a leak in the system allows refrigerant to escape, which decreases the overall pressure inside the system. As a result, the remaining refrigerant absorbs more heat than usual trying to reach the set pressure, leading to higher superheat levels. Conversely, if there's no leak, the system maintains its designated pressure, and superheat levels remain within normal ranges.
The process of gas movement in systems follows the principle of moving from an area of high pressure to an area of low pressure (Answer D). A significant deviation from ideal gas behavior is typically experienced at low temperatures and very high pressures, which can result in changes to the gas's phase.
Furthermore, in the context of a turbine system, a leak can significantly reduce pressure, affecting the pressure difference required for effective operation, as stated in Challenge Problem 87.