Level 1 MLT & MLA Practice Exam
questions with 100% complete
solutions
The primary reason that machinery is replaced is due to:
a) Erosion
b) Accidents
c) Obsolescence
d) Surface degradation of the metal
e) Corrosion - correct answer ✔✔Answer: "d"
Wear is the primary cause of machinery replacement Surface degradation of the metal includes
all types of wear such as abrasion, adhesion, erosion, corrosion, etc.
Which of the following is not a lubrication regime (mode / type)?
a) Boundary
b) Elastohydrodynamic
c) Boundarydynamic
d) Hydrodynamic
e) Mixed film - correct answer ✔✔Answer: "c"
• Boundary lubrication is defined as that regime of lubrication in which the load is carried by the
surface asperities rather than by the lubricant
• Elastohydrodynamic lubrication is a form of hydrodynamic lubrication (full film separation). It
is called elastohydrodynamic because the lubricated components deform elastically due to high
pressure as in antifriction bearings, gears and cams.
,• Hydrodynamic lubrication is also called full film lubrication in which the load is carried totally
by the lubricant. The hydrodynamic film is a result of the relative movement of surfaces and the
viscous resistance of the lubricant
• Mixed film lubrication is a combination of full film and boundary lubrication. In this type, the
lubricant is insufficient to carry the load and provide full film separation. Some points of contact
still occur between surfaces.
Which maintenance strategy is based strictly on tasks performed at specific time intervals?
a) Proactive
b) Predictive
c) Preventive
d) Percussive
e) Reactive - correct answer ✔✔Answer: "c"
Preventive maintenance is time-based. Generally, this type of maintenance is not cost-effective
because parts are changed prematurely and failures occur due to late or improper maintenance.
Condition-based maintenance:
a) is based on the condition of the equipment and the early detection of faults
b) is based on regular time-based overhauls
c) Is based on run to failure
d) is based on the condition of the oil and other root causes
e) Answers a and d - correct answer ✔✔Answer: "e"
Condition-based maintenance is often referred to as predictive maintenance (PdM) where the
ultimate goal is to perform maintenance activity based on early detection of problems using
periodic or continuous monitoring, Obviously, (e) is the correct answer, while (b) and (c)
represent preventive and reactive maintenance, respectively,
,The Pareto Principle (80/20 Rule) states:
a) The largest beneficial effect is obtained from a critical few maintenance tasks
b) The largest beneficial effect is obtained from the (random) many maintenance tasks
c) All machines die sometime
d) All bearings live forever
e) 80 percent of the people do 20 percent of the work - correct answer ✔✔Answer: "a"
In general, the Pareto Principle states that, for many events, roughly 80 percent of the effects
come from 20 percent of the causes, so the correct answer is (a).
Which of the following is not a function of the lubricant?
a) Cool surfaces
b) Separate surfaces
c) Prevent corrosion
d) Repair surfaces
e) Provide some scaling - correct answer ✔✔Answer: "d"
The functions of a lubricant include controlling friction and wear by separating surfaces in
addition to cooling, corrosion prevention, sealing and transmitting power in some applications
such as hydraulic systems. The correct answer is (d), as surface repair cannot be achieved using
lubricants.
Which type or form of lubrication is considered to provide a full fluid (oil) film?
a) Elastohydrodynamic
b) Solid Film
c) Boundary
d) Mixed - correct answer ✔✔Answer: "a"
, Elastohydrodynamic lubrication is a form of hydrodynamic lubrication (full film separation). It is
called elastohydrodynamic because the lubricated components deform clastically due to high
pressure.
Elastohydrodynamic lubrication (EHL) is considered to occur primarily in:
a) Piston rings and liners
b) Journal bearings
c) Rolling bearings, gears and cams
d) Slow-moving pins and bushings
c) Worm gears - correct answer ✔✔Answer: "c"
EHL occurs in systems where the contact area is small and the pressure is high, such as rolling
clement bearings. gears (at the pitch line) and cams. The mating surfaces deform elastically to
enlarge the contact area, which is why it is called clastohydrodynamic lubrication.
The oil film thickness (or dynamic operating clearance) in operating bearings:
a) Cannot be determined
b) Is about 10 microns for journal bearings (although can vary considerably)
c) Is about a micron for rolling bearings
d) Is not measurable
e) Answers b&c - correct answer ✔✔Answer: "e"
Generally, the film thickness in a journal bearing is approximately 10 microns, while in a rolling
element bearing it is about 1 micron. This is why rolling element bearings are more sensitive to
contaminants.
questions with 100% complete
solutions
The primary reason that machinery is replaced is due to:
a) Erosion
b) Accidents
c) Obsolescence
d) Surface degradation of the metal
e) Corrosion - correct answer ✔✔Answer: "d"
Wear is the primary cause of machinery replacement Surface degradation of the metal includes
all types of wear such as abrasion, adhesion, erosion, corrosion, etc.
Which of the following is not a lubrication regime (mode / type)?
a) Boundary
b) Elastohydrodynamic
c) Boundarydynamic
d) Hydrodynamic
e) Mixed film - correct answer ✔✔Answer: "c"
• Boundary lubrication is defined as that regime of lubrication in which the load is carried by the
surface asperities rather than by the lubricant
• Elastohydrodynamic lubrication is a form of hydrodynamic lubrication (full film separation). It
is called elastohydrodynamic because the lubricated components deform elastically due to high
pressure as in antifriction bearings, gears and cams.
,• Hydrodynamic lubrication is also called full film lubrication in which the load is carried totally
by the lubricant. The hydrodynamic film is a result of the relative movement of surfaces and the
viscous resistance of the lubricant
• Mixed film lubrication is a combination of full film and boundary lubrication. In this type, the
lubricant is insufficient to carry the load and provide full film separation. Some points of contact
still occur between surfaces.
Which maintenance strategy is based strictly on tasks performed at specific time intervals?
a) Proactive
b) Predictive
c) Preventive
d) Percussive
e) Reactive - correct answer ✔✔Answer: "c"
Preventive maintenance is time-based. Generally, this type of maintenance is not cost-effective
because parts are changed prematurely and failures occur due to late or improper maintenance.
Condition-based maintenance:
a) is based on the condition of the equipment and the early detection of faults
b) is based on regular time-based overhauls
c) Is based on run to failure
d) is based on the condition of the oil and other root causes
e) Answers a and d - correct answer ✔✔Answer: "e"
Condition-based maintenance is often referred to as predictive maintenance (PdM) where the
ultimate goal is to perform maintenance activity based on early detection of problems using
periodic or continuous monitoring, Obviously, (e) is the correct answer, while (b) and (c)
represent preventive and reactive maintenance, respectively,
,The Pareto Principle (80/20 Rule) states:
a) The largest beneficial effect is obtained from a critical few maintenance tasks
b) The largest beneficial effect is obtained from the (random) many maintenance tasks
c) All machines die sometime
d) All bearings live forever
e) 80 percent of the people do 20 percent of the work - correct answer ✔✔Answer: "a"
In general, the Pareto Principle states that, for many events, roughly 80 percent of the effects
come from 20 percent of the causes, so the correct answer is (a).
Which of the following is not a function of the lubricant?
a) Cool surfaces
b) Separate surfaces
c) Prevent corrosion
d) Repair surfaces
e) Provide some scaling - correct answer ✔✔Answer: "d"
The functions of a lubricant include controlling friction and wear by separating surfaces in
addition to cooling, corrosion prevention, sealing and transmitting power in some applications
such as hydraulic systems. The correct answer is (d), as surface repair cannot be achieved using
lubricants.
Which type or form of lubrication is considered to provide a full fluid (oil) film?
a) Elastohydrodynamic
b) Solid Film
c) Boundary
d) Mixed - correct answer ✔✔Answer: "a"
, Elastohydrodynamic lubrication is a form of hydrodynamic lubrication (full film separation). It is
called elastohydrodynamic because the lubricated components deform clastically due to high
pressure.
Elastohydrodynamic lubrication (EHL) is considered to occur primarily in:
a) Piston rings and liners
b) Journal bearings
c) Rolling bearings, gears and cams
d) Slow-moving pins and bushings
c) Worm gears - correct answer ✔✔Answer: "c"
EHL occurs in systems where the contact area is small and the pressure is high, such as rolling
clement bearings. gears (at the pitch line) and cams. The mating surfaces deform elastically to
enlarge the contact area, which is why it is called clastohydrodynamic lubrication.
The oil film thickness (or dynamic operating clearance) in operating bearings:
a) Cannot be determined
b) Is about 10 microns for journal bearings (although can vary considerably)
c) Is about a micron for rolling bearings
d) Is not measurable
e) Answers b&c - correct answer ✔✔Answer: "e"
Generally, the film thickness in a journal bearing is approximately 10 microns, while in a rolling
element bearing it is about 1 micron. This is why rolling element bearings are more sensitive to
contaminants.
