Oils are usually graded by their service...

Question 1 / 205eccefa2bacbc34ba4d478d7

Question 1 of 205eccefa2bacbc34ba4d478d7

Oils are usually graded by their service classification and __________.

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Question 1 of 20

5eccefa2bacbc34ba4d478d7

Oils are usually graded by their service classification and __________.

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🔍 Key Concepts

• Lubricating oil properties commonly used in machinery selection • The difference between safety-related properties (like fire/flash point) and performance-related properties • How oils are labeled on containers or in technical manuals (e.g., SAE 30, ISO 68)

💭 Think About

• Which of the choices is most directly related to how thick or thin the oil is during actual use in machinery? • Which properties are mainly used for safety/fire hazard assessment rather than everyday service classification? • When engineers or mechanics say an oil is "30-weight" or "ISO 68," which of these properties are they really talking about?

✅ Before You Answer

• Identify which option is the primary performance characteristic for matching oil to engine/bearing clearances • Separate fire safety properties (those involving ignition or burning) from normal grading properties • Think about what appears in manufacturer specs and oil grades on machinery nameplates and lube charts

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Question 1 of 20

Oils are usually graded by their service classification and __________.

fire point

flash point

neutralization number

viscosity

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