Question

technician a says that overheated catalysts cannot be restored and must be replaced. technician b says that overheated catalysts can be easily restored by driving the vehicle for an extended time under a moderate load. who is correct?
o a. technician a
o b. technician b
o c. both technician a and technician b
o d. neither technician a nor technician b

Explanation:

Overheated catalysts undergo physical and chemical changes that cannot be reversed by driving under moderate load. Once overheated, the catalyst's structure (e.g., pore size, active site availability) is altered irreversibly. So Technician A is correct as replacement is the only option for overheated catalysts, while Technician B's method won't restore an overheated catalyst.

Answer:

a. Technician A