and CORRECT Answers
The intermeshing of gear teeth D
is a place where:
A) temperature control is very
important
B) friction reduction is very
important
C) sealing is very important
D) shock absorption is very
important
The separation of two surfaces, A
which is brought about by an
interposing liquid, is called:
A) lubrication
B) viscosity index
C) floc point
D) oil flooding
Wear between two surfaces: A
A) is sometimes beneficial
B) must always be eliminated
C) can always be eliminated
D) is sped up with lubrication
When exposed to air, oil will: B
A) be fine
B) oxidize
C) lose viscosity
D) become thicker
,Besides physically removing D
heat from a component, how
does oil reduce the heat in, say,
a bearing?
A) it reduces the specific heat of
the air in the bearing housing
B) it reduces wear
C) it increases the heat transfer
D) it reduces friction
A material, which is commonly D
used as a solid lubricant, is:
A) tallow
B) wax
C) lime
D) molybdenum disulphide
Which type of grease is the D
cheapest and most commonly
used?
A) lithium based grease
B) teflon based grease
C) paraffin based grease
D) calcium (lime) based grease
The type of grease used for B
heavily loaded machinery
operating at slow speeds is:
A) sodium base grease
B) specialty grease
C) mixed base grease
D) calcium base grease
A semi-solid lubricant: C
A) is best suited for heat
removal
B) has a low viscosity
C) is less likely to drip or splash
from bearings
D) has a low pour point
The characteristics of a good A
grease are largely determined
by:
A) its thickening agent
B) its consistency
C) the type of oil used in the
grease
D) its protective coating
, If a piece of machinery were C
particularly difficult to reach and
service, what type of lubricant
would be useful?
A) an oil
B) a grease
C) a solid lubricant
D) a grease stick
The most common and A
cheapest greases are not
suitable for:
A) temperatures above 70°C
B) sealing dirt from bearings
C) applications where they must
stay in place
D) applications where the
components are infrequently
lubricated
A disadvantage of sodium based B
greases is:
A) they are not suitable of
temperatures above 70°C
B) they are not suitable for use
in wet locations
C) they have a tendency to drip
D) they are not efficient at heat
removal
Aluminum based greases can't C
be used in high speed
applications because:
A) they remove too much heat
B) they tend to soften and melt
C) they have high internal
friction
D) they don't stick well to
components
Which class of liquid lubricant is D
most commonly used?
A) plant-based oils
B) multi-purpose greases
C) animal-based oils
D) mineral oils
Fixed oils are also known as: B
A) synthetic oils
B) fatty oils
C) mineral oils
D) rock oils