10/12/25, 9:14 AM Power engineer class 4 part B Exam (2025) UPDATE Verified Questions And Answers | With 100% Correct Answers graded A+ G…
Power engineer class 4 part B Exam (2025)
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100% Correct Answers graded A+ Guaranteed
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Terms in this set (350)
Most important purposes Friction reduction, wear reduction and corrosion
of lubrication are: reduction
The separation of Lubrication
contacting surfaces is
achieved by:
Friction can be described a resistance to motion
as :
reduce friction
reduce wear
corrosion reduction
lubrication principle
control the Temp
purposes:
shock absorber
provide sealing
* major purpose reduce friction and wear.
Semi solid lubricants pr petroleum oil with a thickening agent.
greases are made by
combining a liquid
lubricant usually:
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The fact that grease has a Textile and food industires
thick, stiff consistency
means that it can be used
under conditions where oil
could leak or drain away,
leaving the bearing dry.
Also grease is less likely to
drip or splash from
bearings. Therefore, it has
a wide application in the:
Grease is suitable for: Ball bearings and roller bearings
Heat must be continually carried away from the
Grease is not suitable
bearing. under these conditions, a liquid lubricant
where large amounts of:
would be used.
Mineral oils thickened with soil lubricants such as
Specialty greases are mad
graphite, mica, and talc. They are used for heavily
of:
operated machinery that operate at slow speeds.
Liquid lubricants are 1 mineral oils
divided into 3 general 2. fixed oils
classes: 3. synthetic oils
Mineral oils are produced crude petroleum
from:
Mineral oils are the most: commonly used class of lubricants.
Cooling for oil lubricated, A separate oil cooler
heavily loaded bearings
can be:
Lubricants act as a: cushion to absorb shock( gear teeth)
Mineral oils constitute the lubricants from crude petroleum
majority of all:
Greases are a : Mixture of mineral oil and thickening agents.
Viscosity is a measure of Liquid to internal deformation or shear. it indicates the
the resistance of a : liquids ability to flow.
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-ability of an oil to a support a load
Viscosity indicates the: - Power required to overcome internal friction
- amount of heat produced due to internal friction
Oil viscosity is greatly Its temperature
affected by:
as temperature increases thinner and less viscous (viscosity will be reduced)
in viscosity oil will
become:
as temperature decreases Thicker and more viscous (viscosity will be increased)
in oil viscosity will be
A commonly used method Saybolt viscometer
to measure viscosity of oil
is:
in a saybolt viscometer, Saybolt Seconds Universal (SSU)
the units are expressed in:
Measuremnt of how much the viscosity of a certain oil
the viscosity index is a:
changes with a temperature change.
The pour point of oil is the: Lowest tempt which a certain oil will flow.
Oils used in cold climates Low pour point
must have a
The flash point of a oil is temp at which it will give off sufficient vapour to ignite
the
the temp at which it gives off enough vapour to burn
the fire point of an oil is
continuously
-anti oxidants
-detergent- dispersants
Some lubricating oil -viscostiy index improvers
additives are: -antifoam additives
-pour point depressants
- corrosion inhibitors
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Lubrication can be 1. boundary lubrication
generally divided into 2 2. FLuid film lubrication
categories:
only a microscopic film of lubricant separates the
boundary lubrication:
surfaces.
Fluid film lubrication Is also called flood lubrication
Friction between 2 resistance to motion (or attempted motion)
surfaces can be defined
quite simply as:
The purpose of lubricants reduce the friction and wear
is to
other then friction and Corrosion, absorb shock, seal and provide temp
wear lubricants control: control
-improper viscosity of oil
-improper bearing design (oil groove, chamfer,
clearance)
Causes of sleeve bearing -misalignment of shaft and bearing
failure: -loss of bearing metal due to corrosion or metal
fatigue
-loss of oil supply
-temp of oil to high
extreme bearing temps water cooled
could lead to trouble. to
prevent this from
happening these bearings
are usually :
a non water cooled eductor horn
bearing may be cooled by
directing a flow of cooling
air to the bearing, via
electric fan or:
if cooling is required not suitable
grease is :
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Power engineer class 4 part B Exam (2025)
UPDATE Verified Questions And Answers | With
100% Correct Answers graded A+ Guaranteed
Success!!
Save
Terms in this set (350)
Most important purposes Friction reduction, wear reduction and corrosion
of lubrication are: reduction
The separation of Lubrication
contacting surfaces is
achieved by:
Friction can be described a resistance to motion
as :
reduce friction
reduce wear
corrosion reduction
lubrication principle
control the Temp
purposes:
shock absorber
provide sealing
* major purpose reduce friction and wear.
Semi solid lubricants pr petroleum oil with a thickening agent.
greases are made by
combining a liquid
lubricant usually:
https://quizlet.com/1091305391/power-engineer-class-4-part-b-exam-2025-update-verified-questions-and-answers-with-100-correct-answers-graded-… 1/40
,10/12/25, 9:14 AM Power engineer class 4 part B Exam (2025) UPDATE Verified Questions And Answers | With 100% Correct Answers graded A+ G…
The fact that grease has a Textile and food industires
thick, stiff consistency
means that it can be used
under conditions where oil
could leak or drain away,
leaving the bearing dry.
Also grease is less likely to
drip or splash from
bearings. Therefore, it has
a wide application in the:
Grease is suitable for: Ball bearings and roller bearings
Heat must be continually carried away from the
Grease is not suitable
bearing. under these conditions, a liquid lubricant
where large amounts of:
would be used.
Mineral oils thickened with soil lubricants such as
Specialty greases are mad
graphite, mica, and talc. They are used for heavily
of:
operated machinery that operate at slow speeds.
Liquid lubricants are 1 mineral oils
divided into 3 general 2. fixed oils
classes: 3. synthetic oils
Mineral oils are produced crude petroleum
from:
Mineral oils are the most: commonly used class of lubricants.
Cooling for oil lubricated, A separate oil cooler
heavily loaded bearings
can be:
Lubricants act as a: cushion to absorb shock( gear teeth)
Mineral oils constitute the lubricants from crude petroleum
majority of all:
Greases are a : Mixture of mineral oil and thickening agents.
Viscosity is a measure of Liquid to internal deformation or shear. it indicates the
the resistance of a : liquids ability to flow.
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,10/12/25, 9:14 AM Power engineer class 4 part B Exam (2025) UPDATE Verified Questions And Answers | With 100% Correct Answers graded A+ G…
-ability of an oil to a support a load
Viscosity indicates the: - Power required to overcome internal friction
- amount of heat produced due to internal friction
Oil viscosity is greatly Its temperature
affected by:
as temperature increases thinner and less viscous (viscosity will be reduced)
in viscosity oil will
become:
as temperature decreases Thicker and more viscous (viscosity will be increased)
in oil viscosity will be
A commonly used method Saybolt viscometer
to measure viscosity of oil
is:
in a saybolt viscometer, Saybolt Seconds Universal (SSU)
the units are expressed in:
Measuremnt of how much the viscosity of a certain oil
the viscosity index is a:
changes with a temperature change.
The pour point of oil is the: Lowest tempt which a certain oil will flow.
Oils used in cold climates Low pour point
must have a
The flash point of a oil is temp at which it will give off sufficient vapour to ignite
the
the temp at which it gives off enough vapour to burn
the fire point of an oil is
continuously
-anti oxidants
-detergent- dispersants
Some lubricating oil -viscostiy index improvers
additives are: -antifoam additives
-pour point depressants
- corrosion inhibitors
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, 10/12/25, 9:14 AM Power engineer class 4 part B Exam (2025) UPDATE Verified Questions And Answers | With 100% Correct Answers graded A+ G…
Lubrication can be 1. boundary lubrication
generally divided into 2 2. FLuid film lubrication
categories:
only a microscopic film of lubricant separates the
boundary lubrication:
surfaces.
Fluid film lubrication Is also called flood lubrication
Friction between 2 resistance to motion (or attempted motion)
surfaces can be defined
quite simply as:
The purpose of lubricants reduce the friction and wear
is to
other then friction and Corrosion, absorb shock, seal and provide temp
wear lubricants control: control
-improper viscosity of oil
-improper bearing design (oil groove, chamfer,
clearance)
Causes of sleeve bearing -misalignment of shaft and bearing
failure: -loss of bearing metal due to corrosion or metal
fatigue
-loss of oil supply
-temp of oil to high
extreme bearing temps water cooled
could lead to trouble. to
prevent this from
happening these bearings
are usually :
a non water cooled eductor horn
bearing may be cooled by
directing a flow of cooling
air to the bearing, via
electric fan or:
if cooling is required not suitable
grease is :
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