ICML MLA 1 CERTIFICATION EXAMINATION
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE
1. Which statement best explains the primary purpose of lubrication
in an industrial machine operating under normal conditions?
A. Increase friction between contacting surfaces
B. Reduce friction, wear, and heat generation between moving surfaces
C. Eliminate the need for equipment inspections
D. Increase the operating temperature of bearings
Answer: B
Rationale: Lubrication separates interacting surfaces, reducing friction
and wear while carrying heat away from critical machine components
during operation.
2. Why is selecting the correct lubricant viscosity particularly
important when lubricating a machine component under varying
operating conditions?
A. Viscosity determines lubricant color only
B. Viscosity affects the lubricant's ability to maintain an adequate
separating film
C. Viscosity eliminates contamination automatically
D. Viscosity determines the manufacturer's warranty period
Answer: B
,Rationale: Viscosity is the single most important property of a lubricant
because it directly controls the formation of the load-carrying film that
separates moving surfaces across different temperatures and speeds.
3. A lubrication technician notices that a bearing is running hotter
than normal after a recent grease change. Which of the following is
the most likely cause?
A. The grease used has a higher base oil viscosity than required
B. The bearing has been under-greased
C. The grease has a lower NLGI grade than required
D. The bearing speed has decreased
Answer: A
Rationale: Using a grease with a base oil viscosity that is too high for the
application can cause excessive churning and heat generation within the
bearing.
4. What is the primary function of an anti-wear (AW) additive in a
lubricating oil?
A. To increase the oil's viscosity index
B. To form a protective film on metal surfaces under boundary
lubrication conditions
C. To prevent water contamination from entering the oil
D. To improve the oil's color stability
Answer: B
,Rationale: Anti-wear additives chemically react with metal surfaces to
form a sacrificial film that protects against metal-to-metal contact when
the lubricant film is too thin to fully separate surfaces.
5. Which oil analysis test is used to measure the remaining useful life
of a lubricant by determining its resistance to oxidation?
A. Fourier Transform Infrared (FTIR) spectroscopy
B. Rotating Pressure Vessel Oxidation Test (RPVOT)
C. Atomic Emission Spectroscopy (AES)
D. Kinematic Viscosity (ASTM D445)
Answer: B
Rationale: The RPVOT measures a lubricant's oxidation stability by
subjecting it to high-pressure oxygen and heat, providing an indication
of remaining antioxidant capacity.
6. When taking an oil sample from a reservoir, why is it recommended
to sample from a consistent location and depth?
A. To reduce the cost of the sampling process
B. To ensure the sample is representative and trendable over time
C. To eliminate the need for bottle cleanliness
D. To increase the sample's viscosity
Answer: B
Rationale: Consistent sampling location and depth ensure that results
can be reliably compared over time, allowing accurate trending of
lubricant condition and machine wear.
, 7. What does the ISO 4406 cleanliness code 18/16/13 represent?
A. The oil's viscosity at 40°C, 100°C, and 150°C
B. The number of particles greater than 4, 6, and 14 microns per
milliliter of oil
C. The oil's acid number, base number, and water content
D. The oil's color, density, and flash point
Answer: B
Rationale: The ISO 4406 code reports particle counts at three size
thresholds: >4 µm, >6 µm, and >14 µm, with each number representing
the logarithmic scale of particle concentration.
8. Which of the following is the most appropriate action if an oil
sample shows a significant increase in the ISO cleanliness code?
A. Immediately drain and replace the oil
B. Investigate the source of contamination, such as a failed breather or
seal
C. Ignore the result as it is within normal variation
D. Increase the lubricant's viscosity
Answer: B
Rationale: An increase in particle count indicates contamination ingress
or generation; identifying and correcting the root cause is essential
before simply changing the oil.
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE
1. Which statement best explains the primary purpose of lubrication
in an industrial machine operating under normal conditions?
A. Increase friction between contacting surfaces
B. Reduce friction, wear, and heat generation between moving surfaces
C. Eliminate the need for equipment inspections
D. Increase the operating temperature of bearings
Answer: B
Rationale: Lubrication separates interacting surfaces, reducing friction
and wear while carrying heat away from critical machine components
during operation.
2. Why is selecting the correct lubricant viscosity particularly
important when lubricating a machine component under varying
operating conditions?
A. Viscosity determines lubricant color only
B. Viscosity affects the lubricant's ability to maintain an adequate
separating film
C. Viscosity eliminates contamination automatically
D. Viscosity determines the manufacturer's warranty period
Answer: B
,Rationale: Viscosity is the single most important property of a lubricant
because it directly controls the formation of the load-carrying film that
separates moving surfaces across different temperatures and speeds.
3. A lubrication technician notices that a bearing is running hotter
than normal after a recent grease change. Which of the following is
the most likely cause?
A. The grease used has a higher base oil viscosity than required
B. The bearing has been under-greased
C. The grease has a lower NLGI grade than required
D. The bearing speed has decreased
Answer: A
Rationale: Using a grease with a base oil viscosity that is too high for the
application can cause excessive churning and heat generation within the
bearing.
4. What is the primary function of an anti-wear (AW) additive in a
lubricating oil?
A. To increase the oil's viscosity index
B. To form a protective film on metal surfaces under boundary
lubrication conditions
C. To prevent water contamination from entering the oil
D. To improve the oil's color stability
Answer: B
,Rationale: Anti-wear additives chemically react with metal surfaces to
form a sacrificial film that protects against metal-to-metal contact when
the lubricant film is too thin to fully separate surfaces.
5. Which oil analysis test is used to measure the remaining useful life
of a lubricant by determining its resistance to oxidation?
A. Fourier Transform Infrared (FTIR) spectroscopy
B. Rotating Pressure Vessel Oxidation Test (RPVOT)
C. Atomic Emission Spectroscopy (AES)
D. Kinematic Viscosity (ASTM D445)
Answer: B
Rationale: The RPVOT measures a lubricant's oxidation stability by
subjecting it to high-pressure oxygen and heat, providing an indication
of remaining antioxidant capacity.
6. When taking an oil sample from a reservoir, why is it recommended
to sample from a consistent location and depth?
A. To reduce the cost of the sampling process
B. To ensure the sample is representative and trendable over time
C. To eliminate the need for bottle cleanliness
D. To increase the sample's viscosity
Answer: B
Rationale: Consistent sampling location and depth ensure that results
can be reliably compared over time, allowing accurate trending of
lubricant condition and machine wear.
, 7. What does the ISO 4406 cleanliness code 18/16/13 represent?
A. The oil's viscosity at 40°C, 100°C, and 150°C
B. The number of particles greater than 4, 6, and 14 microns per
milliliter of oil
C. The oil's acid number, base number, and water content
D. The oil's color, density, and flash point
Answer: B
Rationale: The ISO 4406 code reports particle counts at three size
thresholds: >4 µm, >6 µm, and >14 µm, with each number representing
the logarithmic scale of particle concentration.
8. Which of the following is the most appropriate action if an oil
sample shows a significant increase in the ISO cleanliness code?
A. Immediately drain and replace the oil
B. Investigate the source of contamination, such as a failed breather or
seal
C. Ignore the result as it is within normal variation
D. Increase the lubricant's viscosity
Answer: B
Rationale: An increase in particle count indicates contamination ingress
or generation; identifying and correcting the root cause is essential
before simply changing the oil.
