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Level 1 MLT & MLA Exam practice questions.
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Level 1 MLT & MLA Exam practicequestions
Oil oxidation causes what type of wear ? - ANS-Corrosive wear. Oxidation produces
acids, which lead to corrosive wear.
The cost of wear is typically what ratio of the cost of energy ? - ANS-Two-thirds. It also
is estimated that between one-third and one-half of all energy produced is consumed by
friction.
What are the three particle sizes used to determine the ISO contamination code ? -
ANS-4,6 and 14 microns. The ISO 4406:99 code is assigned on the basis of the number
of particles per unit volume greater than 4, 6 and 14 micrometers. Range numbers
identify each increment in the particle population throughout the spectrum of levels.
What is the total amount of oil purchased in a year divided by the total amount of oil
held by a group of machines known as ? - ANS-The oil consumption ratio. The oil
consumption ratio is used as a KPI to measure the effectiveness of a lubrication
program.
What type of visual inspection should be performed when draining oil from a sump or
reservoir ? - ANS-Examination of the bottom sediment and water bowl(BS&W). The first
liter of oil removed should be collected to inspect for sediment, water , sludge and wear
debris.
Name three reasons for reducing (rationalize) the number of lubricants. -
ANS-Reduction of purchasing and storage problems, bulk purchasing, and reduced risk
of misapplication.
What lubrication failure conditions would you expect to find with tooth breakage in
gearbox ? - ANS-None. This failure condition is typically caused by misalignment or
overloading and is not a lubricant-related failure.
how much dirtier is an oil with a particle count of ISO 18/16/13 compared to an oil with a
particle count of ISO 17/15/12? - ANS-Twice as dirty. Per the ISO 4406:99 Solid
Contaminant Code, the quantity of particles doubles for each increase in code number
and drops by half for each decrease.
,Which type of maintenance is performed according to a fixed schedule involving the
routine repair and replacement of machine parts and components ? - ANS-Preventive
maintenance.
What lubrications could cause an electric motor to run at a high temperatures ? -
ANS-Overgreasing, Underlubrication excessive dirt on the housing and/or an incorrect
lubricant are among the possible causes.
If a plant's lubricant consumption ratio dropped by 25 %, what amount of reduced
lubricant purchases occurred ? - ANS-25%. The total amount of oil purchased in a year
is divided by the total amount of oil held by a group of machines.
Large circulating systems are more suitable for which type of oil change? -
ANS-Condition-based. Oil changes when the lubricant performance is deteriorating are
generally the best option, especially for larger systems where high costs and time are
factors.
which maintenance philosophy is defined as being ahead of the first initiation of failure?
- ANS-Proactive maintenance.
How are maintenance costs paid for ? - ANS-Out of company profits. Maintenance
costs reduce a company's profitability and directly impact the bottom line.
What is the Pareto Principle? - ANS-The 80:20 rule. 20% of the causes of failure are
responsible for 80% of the occurrences of failure. 20% of the machines causes 80% of
the downtime.
what contributes to failure in all departments? - ANS-Lack of training.
Which unit of measurement is sued with flash point and pour point? - ANS-Degrees (C
or F). Flash point is the temperature at which the fluid gives off enough vapor to
instantaneously ignite.
Which base oil has the highest unaided viscosity index(VI)? - ANS-PAO. Polyalphaolefin
(PAO) is a synthetic base oil with a naturally high VI.
When an SAE 20 oils is blended in equal parts with an SAE 40 oils, what will the
resulting SAE grade be ? - ANS-SAE 30.
, In the SAE OW-30 crankcase viscosity classification, what does the "W" stand for ? -
ANS-Winter.
Which oil property determines the level of seal shrinkage or swelling ? - ANS-Solvency.
The level of solvency is referred to as the aniline point and is a reference point for how
much it will cause seals to swell or shrink.
what does API stand for ? - ANS-American Petroleum Institute. API is one of the
governing bodies for oils in the U.S.
Which synthetic base oil would be considered a white oil? - ANS-Polyalphaolefin (PAO).
A white oil refers to a pharmaceutical-grade hydrocarbon fluid that has a water-like
appearance.
Which common synthetic base oil is fire resistant, biodegradable, and has excellent
wear resistance and scuffing protection? - ANS-Phosphate esters. These fluids are
used in power plants, factories, marine vessels, mining, aircraft and mobile equipment.
Which common synthetic base oil provides quality lubricity and high natural viscosity
index, has good temperature stability, is available in both water -soluble and insoluble
forms, and offers low volatility in high-temperature applications? - ANS-Polyalkylene
glycol(PAG). PAGs are commonly used as metalworking fluids, food-grade lubricants,
and in hydraulic and compressor equipment.
Which base oil category has the greatest concentration of aromatics and sulfur? -
ANS-API Group I. Group I oils are the least refined of the five API groups and therefore
contain impurities.
Which mineral base oil property describes the ability to dissolve additives ? -
ANS-Solubility. The solubility base oil is a measure of the oil to hold additives in
solution. the higher the solubility number, the better the oil is able to keep additives from
falling out.
What is the name of the lubrification regime where asperity contact is reduced, film
thickness is increased, and the coefficient of friction drops dramatically? -
ANS-Mixed-film lubrication.
what is the function of a defoamant additive ? - ANS-Defoamants are micro-globules
that enter the skin of a bubble and create a weak spot, increasing its ability to burst.
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