Which of the following are types of seals?

Which of the following are types of seals?

• A. Ball bearings, roller bearings, main engine bearings
• B. Labyrinth seals, thread seals, carbon seals
• C. O-rings, gaskets, seals
• D. Labyrinth seals, o-rings, gaskets

Answer: (B)

Seals come in different types based on how they block leakage, using different methods or materials. Labyrinth seals work by guiding the fluid through a long, winding path, creating leakage resistance without relying on a tight metal-to-metal contact. Thread seals seal threaded connections by filling gaps in the threads with sealants or coatings, preventing leakage at joints. Carbon seals use carbon-based materials to form a durable, high-temperature seal, suitable for demanding environments. These three—labyrinth, thread, and carbon seals—represent distinct sealing approaches across mechanical systems, which is why they form a solid, representative set of seal types. The other options mix in bearings, which are not seals, or list a generic term, or omit common seal types, making them less accurate as a grouping of seal types.

Seals come in different types based on how they block leakage, using different methods or materials. Labyrinth seals work by guiding the fluid through a long, winding path, creating leakage resistance without relying on a tight metal-to-metal contact. Thread seals seal threaded connections by filling gaps in the threads with sealants or coatings, preventing leakage at joints. Carbon seals use carbon-based materials to form a durable, high-temperature seal, suitable for demanding environments.

These three—labyrinth, thread, and carbon seals—represent distinct sealing approaches across mechanical systems, which is why they form a solid, representative set of seal types. The other options mix in bearings, which are not seals, or list a generic term, or omit common seal types, making them less accurate as a grouping of seal types.