When Does Boundary Lubrication Occur

question 1

Multiple Choice

When does boundary lubrication occur?

• A) When distances between metal surfaces are wider.
• B) Only between two dissimilar metal surfaces.
• C) When distances between metal surfaces are narrow.
• D) When the primary function of the lubrication is cooling.

---

Definitions:

Convex Preferences

A set of consumer preferences that exhibit a specific property where mixtures of goods are preferred over singular extremes, displaying a curve outward towards the origin on a utility graph.

Weakly Convex

Describes a curve or set in geometry and mathematical functions that bulges outward less sharply than a perfectly convex shape, often applied in optimization problems.

Convex Preferences

A representation in economics of a consumer preference structure where a mix or combination of two goods is preferred over either of the two goods alone, indicating a desire for diversification.

Indifference Curves

A graphical representation of different bundles of goods between which a consumer is indifferent, showing the same level of satisfaction or utility for each point on the curve.