Practice Test Geeks(ITMC) Industrial Technology Maintenance Certification Practice Test
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Lubrication Flashcards

7 cards from real ITMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Lubrication flashcards as text

  1. What does the viscosity index (VI) of an oil indicate?

    Answer: How much the oil's viscosity changes with temperature

    Viscosity index measures how much an oil's viscosity changes with temperature — a higher VI means the viscosity stays more stable across temperature ranges.

  2. Which lubrication method continuously delivers oil to a bearing by using a wick or felt pad submerged in an oil reservoir?

    Answer: Wick-feed lubrication

    Wick-feed lubrication uses capillary action through a wick or felt pad to draw oil from a reservoir and deliver it continuously to a bearing surface.

  3. What is the primary purpose of an EP (extreme pressure) additive in a lubricant?

    Answer: To prevent metal-to-metal contact under high load conditions

    EP additives react chemically with metal surfaces under high pressure and temperature to form a sacrificial film that prevents metal-to-metal contact and welding.

  4. A grease with an NLGI grade of 2 is compared to one with an NLGI grade of 0. Which statement is correct?

    Answer: Grade 2 is stiffer and more commonly used in general bearing applications

    Higher NLGI numbers indicate stiffer grease; NLGI 2 is a medium-firm grease used widely in general-purpose bearing lubrication.

  5. During a routine oil analysis, the report shows a high level of silicon in the oil sample. What does this most likely indicate?

    Answer: Dirt or dust is entering the system through a failed seal or breather

    Silicon is a primary indicator of dirt or dust ingression, which typically occurs through failed seals, damaged breathers, or contaminated fill equipment.

  6. What is the function of a labyrinth seal on a lubricated bearing housing?

    Answer: To create a tortuous path that prevents contaminants from entering without contact friction

    Labyrinth seals use a series of grooves and channels to create a non-contact barrier that makes it difficult for contaminants to enter the bearing housing.

  7. Which property of a lubricant describes its ability to spread over and adhere to metal surfaces even under pressure?

    Answer: Film strength (oiliness)

    Film strength or oiliness refers to a lubricant's ability to maintain an adsorbed film on metal surfaces and resist being squeezed out under load.