Practice Test Geeks(CMRT) Certified Maintenance and Reliability Technician Practice Test
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CMRT Lubrication and Tribology Flashcards

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

Read the first 6 CMRT Lubrication and Tribology flashcards as text

  1. What does the term 'tribology' refer to in the context of maintenance?

    Answer: The study of friction, wear, and lubrication between interacting surfaces

    Tribology is the science that studies friction, wear, and lubrication of interacting surfaces in relative motion.

  2. Which lubrication regime occurs when the lubricant film fully separates the two mating surfaces?

    Answer: Hydrodynamic (full-film) lubrication

    Hydrodynamic (full-film) lubrication occurs when the lubricant film is thick enough to completely separate the mating surfaces, minimizing metal-to-metal contact.

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

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

    The viscosity index (VI) indicates how much an oil's viscosity changes with temperature; a higher VI means less viscosity change over a wide temperature range.

  4. Which type of grease thickener is most commonly used in industrial bearings due to its high temperature and water-resistance properties?

    Answer: Lithium soap

    Lithium soap is the most widely used grease thickener in industrial applications because it offers a good balance of high-temperature stability, water resistance, and mechanical stability.

  5. What does ISO VG 46 mean on a hydraulic oil label?

    Answer: The oil has a nominal kinematic viscosity of 46 cSt at 40°C

    ISO VG (Viscosity Grade) 46 means the oil has a nominal kinematic viscosity of 46 centistokes (cSt) at 40°C as defined by ISO 3448.

  6. What is the purpose of an oil analysis program in a reliability maintenance strategy?

    Answer: To detect contamination, wear metals, and degradation trends before failure occurs

    Oil analysis programs detect wear metals, contamination, and oil degradation trends, enabling condition-based oil changes and early warning of developing component failures.