Which statement is true regarding cast iron and chrome plated piston rings?

The statement asserting that both cast iron piston rings can be used in chrome plated cylinders and that chrome plated rings can only be used in chrome plated cylinders is accurate.

Cast iron piston rings are compatible with chrome plated cylinders because they can provide sufficient durability and wear resistance without causing damage to the chrome surface. This compatibility allows for effective sealing and optimal engine performance.

On the other hand, chrome plated piston rings are specifically designed to operate in chrome plated cylinders. The chrome plating on both the rings and the cylinders helps reduce friction and wear, leading to enhanced performance and longevity of the engine components. Using chrome plated rings with non-chrome plated cylinders may result in suboptimal sealing and increased wear, which is why their use is generally limited to environments that match their coating.

The ability of cast iron rings to effectively function in chrome plated cylinders alongside the necessity for chrome plated rings to be used in similarly treated surfaces supports the correctness of the combined statements.