ICML MLA I CERTIFICATION EXAMINATION - 200 COMPLETE
EXAM QUESTIONS AND DETAILED SOLUTIONS (2026/2027
LATEST UPDATE)
1. Which of the following is the most significant contributor to
premature machine failure in an industrial facility?
A. Excessive preventive maintenance
B. Poor lubrication practices
C. Oversized bearings
D. Excessive oil changes
Answer: B
Rationale: Studies consistently show that a majority of premature
machine failures are directly linked to improper or inadequate
lubrication practices, including wrong lubricant selection,
contamination, and incorrect application methods.
2. Under hydrodynamic lubrication conditions, what separates the
two moving surfaces?
A. A solid lubricant film
B. A thin film of liquid lubricant
C. A layer of grease
D. A chemical boundary film
Answer: B
Rationale: Hydrodynamic lubrication occurs when a full fluid film of
lubricant completely separates the surfaces, preventing metal-to-metal
contact and minimizing friction and wear.
,3. Which type of lubrication regime is characterized by partial surface
contact and is commonly found in heavily loaded or slow-speed
applications?
A. Hydrodynamic
B. Elasto-hydrodynamic
C. Mixed-film
D. Full-film
Answer: C
Rationale: Mixed-film lubrication exists when the lubricant film is not
thick enough to completely separate the surfaces, resulting in
intermittent asperity contact.
4. What is the primary function of additives in a lubricating oil?
A. To increase the oil's viscosity
B. To enhance or impart specific performance properties
C. To reduce the oil's cost
D. To change the oil's color
Answer: B
Rationale: Additives are chemical compounds added to base oils to
improve properties such as oxidation resistance, anti-wear
performance, corrosion protection, and detergency.
5. Which viscosity measurement method is most commonly used for
industrial lubricating oils?
A. Saybolt Universal Seconds
,B. Kinematic Viscosity at 40°C (ASTM D445)
C. Engler Viscosity
D. Redwood Viscosity
Answer: B
Rationale: Kinematic viscosity at 40°C is the standard measurement for
industrial lubricating oils, providing a consistent basis for comparing and
selecting lubricants.
6. What does a high Viscosity Index (VI) indicate about a lubricant?
A. The lubricant has a high pour point
B. The lubricant's viscosity changes significantly with temperature
C. The lubricant's viscosity changes relatively little with temperature
D. The lubricant has poor oxidation stability
Answer: C
Rationale: A high VI indicates that the lubricant's viscosity is relatively
stable across a wide temperature range, which is desirable for many
applications.
7. Which of the following is NOT a common thickener type used in
lubricating greases?
A. Lithium
B. Calcium
C. Polyalphaolefin (PAO)
D. Aluminum complex
Answer: C
Rationale: Polyalphaolefin (PAO) is a synthetic base oil, not a thickener.
, Common grease thickeners include lithium, calcium, aluminum
complex, and polyurea.
8. When selecting a lubricant for a hydraulic system, which property is
most critical?
A. High viscosity index and good filterability
B. High pour point
C. High volatility
D. Low flash point
Answer: A
Rationale: Hydraulic systems require lubricants with a high viscosity
index for consistent performance across temperatures and good
filterability to maintain system cleanliness.
9. What is the primary purpose of a breather on a lubricant storage
tank?
A. To allow lubricant to be added
B. To prevent contamination from entering the tank while allowing air
to escape
C. To measure the lubricant level
D. To heat the lubricant
Answer: B
Rationale: Breathers prevent airborne contaminants such as dust and
moisture from entering the tank while allowing air to enter or escape as
the lubricant level changes.
EXAM QUESTIONS AND DETAILED SOLUTIONS (2026/2027
LATEST UPDATE)
1. Which of the following is the most significant contributor to
premature machine failure in an industrial facility?
A. Excessive preventive maintenance
B. Poor lubrication practices
C. Oversized bearings
D. Excessive oil changes
Answer: B
Rationale: Studies consistently show that a majority of premature
machine failures are directly linked to improper or inadequate
lubrication practices, including wrong lubricant selection,
contamination, and incorrect application methods.
2. Under hydrodynamic lubrication conditions, what separates the
two moving surfaces?
A. A solid lubricant film
B. A thin film of liquid lubricant
C. A layer of grease
D. A chemical boundary film
Answer: B
Rationale: Hydrodynamic lubrication occurs when a full fluid film of
lubricant completely separates the surfaces, preventing metal-to-metal
contact and minimizing friction and wear.
,3. Which type of lubrication regime is characterized by partial surface
contact and is commonly found in heavily loaded or slow-speed
applications?
A. Hydrodynamic
B. Elasto-hydrodynamic
C. Mixed-film
D. Full-film
Answer: C
Rationale: Mixed-film lubrication exists when the lubricant film is not
thick enough to completely separate the surfaces, resulting in
intermittent asperity contact.
4. What is the primary function of additives in a lubricating oil?
A. To increase the oil's viscosity
B. To enhance or impart specific performance properties
C. To reduce the oil's cost
D. To change the oil's color
Answer: B
Rationale: Additives are chemical compounds added to base oils to
improve properties such as oxidation resistance, anti-wear
performance, corrosion protection, and detergency.
5. Which viscosity measurement method is most commonly used for
industrial lubricating oils?
A. Saybolt Universal Seconds
,B. Kinematic Viscosity at 40°C (ASTM D445)
C. Engler Viscosity
D. Redwood Viscosity
Answer: B
Rationale: Kinematic viscosity at 40°C is the standard measurement for
industrial lubricating oils, providing a consistent basis for comparing and
selecting lubricants.
6. What does a high Viscosity Index (VI) indicate about a lubricant?
A. The lubricant has a high pour point
B. The lubricant's viscosity changes significantly with temperature
C. The lubricant's viscosity changes relatively little with temperature
D. The lubricant has poor oxidation stability
Answer: C
Rationale: A high VI indicates that the lubricant's viscosity is relatively
stable across a wide temperature range, which is desirable for many
applications.
7. Which of the following is NOT a common thickener type used in
lubricating greases?
A. Lithium
B. Calcium
C. Polyalphaolefin (PAO)
D. Aluminum complex
Answer: C
Rationale: Polyalphaolefin (PAO) is a synthetic base oil, not a thickener.
, Common grease thickeners include lithium, calcium, aluminum
complex, and polyurea.
8. When selecting a lubricant for a hydraulic system, which property is
most critical?
A. High viscosity index and good filterability
B. High pour point
C. High volatility
D. Low flash point
Answer: A
Rationale: Hydraulic systems require lubricants with a high viscosity
index for consistent performance across temperatures and good
filterability to maintain system cleanliness.
9. What is the primary purpose of a breather on a lubricant storage
tank?
A. To allow lubricant to be added
B. To prevent contamination from entering the tank while allowing air
to escape
C. To measure the lubricant level
D. To heat the lubricant
Answer: B
Rationale: Breathers prevent airborne contaminants such as dust and
moisture from entering the tank while allowing air to enter or escape as
the lubricant level changes.
