Question

11. Machines operating under high temperature and load are best lubricated by _____.
O Mineral oils
O Solid lubricants
O Grease
O Animal oil​

Answer 1

Answer:

Machines operating under high temperature and load are best lubricated by solid lubricants

Explanation:

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Answer 2

Machines operating under high temperature and load are best lubricated by mineral oils.

Explanation:

• The best lubricants are those that are non-solid, non-fluid, and non-greasy: mineral oils, solid lubricants, and grease.
• These materials are not fluids; they are solids at room temperature.
• They are not easily separated from the parts they're meant to help, so they are unlikely to migrate from places where they're needed to places where it would be best to avoid them.
• They also have high durability and longevity.
• Because high temperatures and high loads lead to excessive wear, most mechanical systems need some sort of lubricant.
• The lubricant helps reduce friction, thus allowing the metal surfaces to move more easily with respect to each other.