II Practice Exam Questions And Correct

Machinery Lubrication Technician Level II Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which type of wear occurs when two surfaces slide against each other

under load?

• Adhesive
• Abrasive
• Corrosive
• Fatigue
• Abrasive

Abrasive wear occurs when hard particles or rough surfaces slide against a softer surface, causing material removal.

• Which property of a lubricant is primarily responsible for reducing

friction? 1 / 4

• Viscosity
• Oxidation stability
• Pour point
• Water content
• Viscosity

Viscosity forms a lubricating film that separates metal surfaces, reducing friction.

• What is the main cause of varnish formation in lubricating oils?
• Microbial contamination
• Oxidation of oil
• High water content
• Low viscosity
• Oxidation of oil

Varnish forms when lubricants oxidize under heat, creating sticky residues on surfaces.

• Which lubricant additive improves extreme pressure performance?
• Anti-foam agent
• Detergent
• EP additive
• Pour point depressant 2 / 4

• EP additive

Extreme Pressure (EP) additives chemically react with metal surfaces to prevent welding under high loads.

• Which instrument measures particle contamination in oil?
• Viscometer
• Ferrograph
• Spectrometer
• Particle counter
• Particle counter

Particle counters quantify contamination by counting and sizing particles in lubricating oils.

• What is the primary purpose of oil analysis?
• Reduce viscosity
• Detect early wear and contamination
• Increase flash point
• Improve pour point
• Detect early wear and contamination

Oil analysis identifies abnormal wear patterns, contamination, and lubricant degradation.

• Which type of wear is associated with rolling contact surfaces, such as

bearings?

• Adhesive 3 / 4

• Abrasive
• Fatigue
• Corrosive
• Fatigue

Rolling contact fatigue occurs when repeated stress causes surface pitting on bearings or gears.

• What does the Total Acid Number (TAN) indicate in lubricating oil?
• Water content
• Oxidation and acidic degradation
• Viscosity index
• Particle count
• Oxidation and acidic degradation

TAN measures acidity in oil, indicating oxidation and potential corrosion risk.

• Which method is best for removing solid contaminants from hydraulic

oil?

• Water washing
• Centrifugation
• Filtration
• Chemical treatment
• Filtration

Filtration removes solid particles, extending fluid and component life.

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