ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
1. A circulating oil system has shown stable viscosity, but sudden
foaming started after a recent oil top-up. Lab analysis shows no water.
What's the most probable cause?
A. Filter bypass valve stuck open
B. Mixing with an incompatible oil formulation
C. Bearing clearance increased
D. Depletion of antioxidants - ANSWERS-Answer: B
Explanation: A sudden onset of foaming without water often occurs
when different base oils or additive chemistries are mixed (e.g.,
incompatible defoamers). This leads to destabilized surface tension and
foaming
2. A lube analyst detects babbitt metal (tin + lead) particles in an oil
sample. Which component is the most likely source?
A. Rolling element bearing
B. Bronze gear
C. Plain journal bearing
D. Shaft key - ANSWERS-Answer: C
END OF
PAGE
1
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
Explanation: Babbitt metal is a soft alloy (tin/lead/antimony) commonly
used as a lining for plain journal bearings, especially in turbines and
large pumps. Its detection usually indicates bearing distress or wiping
3. Which of the following sampling methods is least reliable for trending
particle contamination?
A. Live zone sampling from a turbulent return line
B. Sampling from a dedicated sample port downstream of critical
components
C. Sampling from the top of a static reservoir when the machine is
offline
D. Sampling from a recirculation loop during operation - ANSWERS-
Answer: C
Explanation: Static reservoir sampling when offline is the least
representative, as particles settle and fluid conditions don't reflect actual
system cleanliness. Best practice is turbulent, live-zone sampling
4. An oil analysis report shows TBN ≈ TAN, where previously TBN was
higher. What does this typically indicate for an engine oil?
END OF
PAGE
2
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
A. Normal break-in wear
B. Oxidation reserve still adequate
C. Depletion of the base reserve → time for oil change
D. Viscosity index improver shear - ANSWERS-Answer: C
Explanation: For engine oils, TBN (base reserve) dropping to equal
TAN (acid number) is a classic condemnation limit: base is largely
consumed neutralizing acids, oxidation is advancing, and oil change is
due.
5. When changing from a mineral oil to a synthetic PAO-based oil in a
circulating system, which step is most important to prevent problems?
A. Adding extra antioxidant additive
B. Lowering the operating temperature
C. Performing a full flush and compatibility check before changeover
D. Doubling filter size - ANSWERS-Answer: C
Explanation: Different base oils (e.g., PAO vs Group I) can be
incompatible, causing sludge/varnish or additive fallout. ICML & KEW
stress flush + compatibility test as critical steps in oil conversions
END OF
PAGE
3
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
6. A new sample point is being installed. According to best practices,
where should the sampling valve be located in a circulating lube system?
A. On the drain line at the lowest point
B. At the reservoir vent
C. On a turbulent line, downstream of critical components but upstream
of filters
D. Upstream of the pump suction - ANSWERS-Answer: C
Explanation: The most representative sampling point is on a turbulent
line downstream of components (to catch generated contaminants) but
upstream of filters (so they're not removed before detection).
7. What is the main disadvantage of taking vacuum pump samples
directly from the reservoir surface?
A. Sample bottles may explode
B. Excessive air entrainment in the oil
C. It may pull settled debris or surface contaminants, giving a non-
representative, dirty sample
END OF
PAGE
4
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
1. A circulating oil system has shown stable viscosity, but sudden
foaming started after a recent oil top-up. Lab analysis shows no water.
What's the most probable cause?
A. Filter bypass valve stuck open
B. Mixing with an incompatible oil formulation
C. Bearing clearance increased
D. Depletion of antioxidants - ANSWERS-Answer: B
Explanation: A sudden onset of foaming without water often occurs
when different base oils or additive chemistries are mixed (e.g.,
incompatible defoamers). This leads to destabilized surface tension and
foaming
2. A lube analyst detects babbitt metal (tin + lead) particles in an oil
sample. Which component is the most likely source?
A. Rolling element bearing
B. Bronze gear
C. Plain journal bearing
D. Shaft key - ANSWERS-Answer: C
END OF
PAGE
1
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
Explanation: Babbitt metal is a soft alloy (tin/lead/antimony) commonly
used as a lining for plain journal bearings, especially in turbines and
large pumps. Its detection usually indicates bearing distress or wiping
3. Which of the following sampling methods is least reliable for trending
particle contamination?
A. Live zone sampling from a turbulent return line
B. Sampling from a dedicated sample port downstream of critical
components
C. Sampling from the top of a static reservoir when the machine is
offline
D. Sampling from a recirculation loop during operation - ANSWERS-
Answer: C
Explanation: Static reservoir sampling when offline is the least
representative, as particles settle and fluid conditions don't reflect actual
system cleanliness. Best practice is turbulent, live-zone sampling
4. An oil analysis report shows TBN ≈ TAN, where previously TBN was
higher. What does this typically indicate for an engine oil?
END OF
PAGE
2
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
A. Normal break-in wear
B. Oxidation reserve still adequate
C. Depletion of the base reserve → time for oil change
D. Viscosity index improver shear - ANSWERS-Answer: C
Explanation: For engine oils, TBN (base reserve) dropping to equal
TAN (acid number) is a classic condemnation limit: base is largely
consumed neutralizing acids, oxidation is advancing, and oil change is
due.
5. When changing from a mineral oil to a synthetic PAO-based oil in a
circulating system, which step is most important to prevent problems?
A. Adding extra antioxidant additive
B. Lowering the operating temperature
C. Performing a full flush and compatibility check before changeover
D. Doubling filter size - ANSWERS-Answer: C
Explanation: Different base oils (e.g., PAO vs Group I) can be
incompatible, causing sludge/varnish or additive fallout. ICML & KEW
stress flush + compatibility test as critical steps in oil conversions
END OF
PAGE
3
, ICML MLA 1 LATEST
CERTIFICATION EXAM
QUESTIONS AND
ANSWERS 2026 - 2027
6. A new sample point is being installed. According to best practices,
where should the sampling valve be located in a circulating lube system?
A. On the drain line at the lowest point
B. At the reservoir vent
C. On a turbulent line, downstream of critical components but upstream
of filters
D. Upstream of the pump suction - ANSWERS-Answer: C
Explanation: The most representative sampling point is on a turbulent
line downstream of components (to catch generated contaminants) but
upstream of filters (so they're not removed before detection).
7. What is the main disadvantage of taking vacuum pump samples
directly from the reservoir surface?
A. Sample bottles may explode
B. Excessive air entrainment in the oil
C. It may pull settled debris or surface contaminants, giving a non-
representative, dirty sample
END OF
PAGE
4
