Final answer:
a) Decreased system pressure. A consequence of a fixed restriction system operating with a refrigerant overcharge is decreased system pressure.
Step-by-step explanation:
A consequence of a fixed restriction system operating with a refrigerant overcharge is decreased system pressure. When there is an overcharge of refrigerant in the system, it can lead to increased pressure. This can cause damage to the system and decrease its efficiency.
The correct answer is option a) Decreased system pressure.