FAA Powerplant Written Practice Test

Which of the following statements about piston rings in different cylinder types is true?

1. Cast iron rings can be used in chrome plated cylinders

2. Chrome plated rings can be used in plain steel cylinders

3. Both statements are true

4. Neither statement is true

The correct answer is: Both statements are true

The correct understanding regarding piston rings and cylinder types relates to their materials and compatibility. Cast iron rings are designed to function effectively in various cylinder types, including those that are chrome plated. These rings can withstand the harder surfaces of chrome plating, making them suitable for such applications. On the other hand, chrome plated rings are engineered for use in plain steel cylinders. The hard surface of a chrome plating can cause issues with adherence and wear if paired with rings not designed for that environment. However, in plain steel cylinders, these chrome plated rings are highly effective due to their durability and reduced friction characteristics. Both of these statements highlight the proper applications of the respective rings in their compatible cylinder types, confirming that the choice stating that both statements are true is accurate. Understanding these compatibility principles is crucial for ensuring the longevity and performance of the engine components.