a) Fluid film theory
b) Boundary layer theory
c) Fluid film & Boundary layer theory
d) Thermosiphon theory
Answer: c
Explanation: According to fluid film theory, the lubricant is supposed to act like mass of globules, rolling in between two surfaces. It produces a rolling effect whereas according to boundary layer theory, the lubricant is soaked in rubbing surfaces and forms oily surface over it.
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