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VIU PWR ENG Part B > Lubrication and Bearings > Flashcards

Lubrication and Bearings Flashcards

1
Q 
The majority of lubricants are:
Select one:
a. Animal fats
b. Synthetic oils
c. Mineral oils
d. Greases
A

c. Mineral oils

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2
Q

A large journal bearing which is running hotter than normal can be cooled by:
Select one:
a. Direct application of cool water
b. Loosening the bearing caps
c. Decreasing the viscosity of the oil by cooling it
d. pumping additional grease into it

A

b. Loosening the bearing caps

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3
Q 
A normal anti-friction bearing temperature operating range is:
Select one:
a. 150°C to 160°C
b. 20°C to 50°C
c. 65°C to 70°C
d. 80°C to 120°C
A

c. 65°C to 70°C

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4
Q 
The point at which oil will give off enough vapour to ignite and burn continuously is known as the \_\_\_\_\_ point.
Select one:
a. Flash
b. Ignition
c. Fire
d. Vaporization
A

c. Fire

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5
Q 
If ambient air temperatures are very low, the preferred lubricant is a:
Select one:
a. Solid
b. Semi-solid
c. Fixed oil
d. Liquid
A

a. Solid

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6
Q 
Lubricants used for high-output steam turbines should:
Select one:
a. Have a very high viscosity
b. Be fire resistant
c. Have a low pour point
d. Mix well with water
A

b. Be fire resistant

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7
Q 
The property of oil that indicates its ability to support a load is:
Select one:
a. Viscosity
b. Viscosity index
c. Pour point
d. Floc point
A

a. Viscosity

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8
Q 
The ability of an oil to lift and support heavy loads depends upon:
Select one:
a. kinetic energy
b. Hydraulic pressure
c. acceleration
d. Pour point
A

b. Hydraulic pressure

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9
Q

Large journal or sleeve bearings have grooves:
Select one:
a. In the high pressure area of the bearing babbit
b. Cut into the bearing housing
c. For distributing lubricant evenly just after the pressure area
d. In the non-pressure area

A

d. In the non-pressure area

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10
Q 
Where gear teeth inter-mesh, a lubricant must provide
Select one:
a. Corrosion prevention
b. Sealing 
c. Shock absorption 
d. Temperature control
A

c. Shock absorption

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11
Q 
A shell type bearing:
Select one:
a. Is used for axial thrust
b. Is an anti-friction bearing
c. Consists of ball bearings in a shell
d. Is used for heavy loads
A

d. Is used for heavy loads

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12
Q 
Air compressor oil should:
Select one:
a. Have a very low viscosity
b. Have low carbon residue
c. Have a low flash point
d. Not contain anti-oxidants
A

b. Have low carbon residue

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13
Q 
Which of the following has the greatest effect on the viscosity of lubrication oil?
Select one:
a. Pressure
b. Load
c. Temperature
d. Speed
A

c. Temperature

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14
Q 
A journal bearing:
Select one:
a. Controls thrust movement
b. Does not require lubrication
c. require cooling water
d. Supports a shaft
A

d. Supports a shaft

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15
Q 
When inspecting a dismantled bearing, the first indication of a failing bearing is:
Select one:
a. Cracked balls
b. Roughness
c. Discoloration
d. Rusting or corrosion
e. Tapered rollers
A

b. Roughness

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16
Q 
Fluid film lubrication:
Select one:
a. eliminates all bearing friction
b. Is different from flood lubrication
c. Supports heavy loads
d. Prevents wear during start-up
A

c. Supports heavy loads

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17
Q

When replacing or removing an anti-friction ball bearing, the applied force should:
Select one:
a. Not be transmitted through the bearing balls
b. Always be against the inner race
c. Always be against the outer race
d. Be made only after heating the bearing

A

a. Not be transmitted through the bearing balls

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18
Q 
When grease is used in an antifriction bearing after cleaning, the bearing housing should not be filled \_\_\_\_\_ full.
Select one:
a. more than 1/3
b. more than 1/2
c. more than 3/4
d. less than completely
A

a. more than 1/3

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19
Q 
The groove that is cut in the top half in the lining of a shell bearing should not extend closer to the ends than:
Select one:
a. 3 mm
b. 10 mm
c. 1.25 cm
d. 1.7 cm
A

c. 1.25 cm

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20
Q 
If an oil must flow at a very low temperature, it must have the following additive:
Select one:
a. Viscosity index improver
b. Pour point depressant
c. Dispersant
d. Floc point improver
A

b. Pour point depressant

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21
Q 
A type of anti-friction bearing is the \_\_\_\_\_ .
Select one:
a. Kingsbury
b. Ball bearing 
c. Sleeve bearing
d. Journal bearing
A

b. Ball bearing

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22
Q 
A thrust bearing which does not utilize the oil wedge principle of lubrication is the:
Select one:
a. Michell type
b. Collar type 
c. Radial type
d. Kingsbury type
A

b. Collar type

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23
Q 
The resistance of a liquid to internal deformation or shear is known as:
Select one:
a. Pour point
b. Viscosity index
c. Flash point
d. Viscosity
A

d. Viscosity

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24
Q 
The instrument that measures the viscosity of an oil at a certain temperature as it flows through a small diameter tube, is called:
Select one:
a. An orifice plate
b. A Saybolt viscometer 
c. An oil meter
d. A vena contracta
A

b. A Saybolt viscometer

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25
Q 
A form of lubrication that requires continual motion of a shaft or surface is:
Select one:
a. Boundary lubrication
b. Continuous lubrication
c. Forced lubrication
d. Fluid film lubrication
A

d. Fluid film lubrication

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26
Q 
A common cause of antifriction bearing failure is:
Select one:
a. High RPM service
b. Extreme cold temperature cracking
c. Drive motor overload
d. Shaft misalignment
A

d. Shaft misalignment

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27
Q 
The \_\_\_\_\_ number of oil indicates the acidity of oil.
Select one:
a. Acidity
b. Alkalinity
c. Neutralization 
d. Viscosity index
A

c. Neutralization

28
Q 
The characteristics of a grease are determined by:
Select one:
a. Its thickening agent or “soap” 
b. Its consistency
c. The type of oil used in the grease
d. Its protective coating
A

a. Its thickening agent or “soap”

29
Q

Using pressurized air to blow out a cleaned bearing:
Select one:
a. Should only be done in well-ventilated areas
b. Must be done only while the bearing is hot
c. Will cause the bearing to become “pitted”
d. should be done at an angle so the bearing can spin

A

c. Will cause the bearing to become “pitted”

30
Q

The lubricant for an anti-friction bearing:
Select one:
a. Will separate the moving parts completely
b. Must be cooled
c. Could be a semi-solid lubricant
d. Should have a high viscosity

A

c. Could be a semi-solid lubricant

31
Q

Grease:
Select one:
a. Is a semi-liquid
b. Is an excellent high-speed, low load lubricant
c. Attracts dirt and water to bearings, leading to premature failure
d. Can be used under conditions where oil may leak away and leave the bearing dry

A

d. Can be used under conditions where oil may leak away and leave the bearing dry

32
Q 
The oil for a refrigeration compressor must:
Select one:
a. Have a low pour point 
b. Have a high flash point
c. Have a high fire point
d. Be a multi-grade type
A

a. Have a low pour point

33
Q 
The kind of grease used for heavily loaded machinery operating at slow speeds is the:
Select one:
a. Sodium base grease
b. Specialty grease 
c. Calcium base grease
d. Aluminum base grease
A

b. Specialty grease

34
Q 
All semi-solid lubricants:
Select one:
a. Have a low viscosity
b. Are capable of sealing out dirt and water from bearings 
c. Contain graphite
d. Resist moisture
A

b. Are capable of sealing out dirt and water from bearings

35
Q 
The proper way to store a bearing after cleaning is to dip it in \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ and wrap it in grease-proof paper.
Select one:
a. a desiccant such as rice 
b. Wax
c. Solvent
d. A rust preventative
A

d. A rust preventative

36
Q 
Applying installation forces through the balls of a bearing can cause:
Select one:
a. Bearing misalignment
b. too large an air gap
c. Cracking or breaking of the balls
d. Brinelling
A

d. Brinelling

37
Q

Grease is not a suitable lubricant:
Select one:
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. If a large amount of cooling is desired

A

d. If a large amount of cooling is desired

38
Q 
The cheapest and most commonly used grease is:
Select one:
a. Potassium base
b. Chlorine base
c. Lime base 
d. Sulphate base
A

c. Lime base

39
Q 
Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil
b. Low viscosity oil
c. Synthetic oils 
d. Fixed oils
A

a. High viscosity oil

40
Q

With antifriction bearings using grease, the bearings:
Select one:
a. Must be cleaned twice as often as oil-lubricated bearings
b. can be cleaned by adding solvent to the grease cartridge
c. Are cleaned less often than oil-lubricated bearings
d. Never require cleaning

A

c. Are cleaned less often than oil-lubricated bearings

41
Q 
A collar thrust bearing:
Select one:
a. Can support more load than a Michell thrust bearing
b. Is an anti-friction type bearing
c. Is used with steam turbines only
d. Has boundary lubrication
A

d. Has boundary lubrication

42
Q 
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
c. Molybdenum disulfide 
d. Sodium carbonate
A

c. Molybdenum disulfide

43
Q

When replacing or removing an anti-friction ball bearing, the applied force should:
Select one:
a. Not be transmitted through the bearing balls
b. Always be against the inner race
c. Always be against the outer race
d. Be made only after heating the bearing

A

a. Not be transmitted through the bearing balls

44
Q 
If an oil’s viscosity changes a lot with very little temperature change, it will have a:
Select one:
a. Low viscosity index 
b. High pour point
c. High viscosity index
d. Low pour point
A

a. Low viscosity index

45
Q 
An anti-friction bearing:
Select one:
a. Is constructed with white metal alloy
b. Wears to a smooth, low-friction surface
c. Has rolling friction 
d. Is a sleeve bearing
A

c. Has rolling friction

46
Q 
The oil for a refrigeration compressor must:
Select one:
a. Have a low pour point 
b. Have a high flash point
c. Have a high fire point
d. Be a multi-grade type
A

a. Have a low pour point

47
Q 
Air compressor oil should:
Select one:
a. Have a very low viscosity
b. Have low carbon residue 
c. Have a low flash point
d. Not contain anti-oxidants
A

b. Have low carbon residue

48
Q 
A type of anti-friction bearing is the \_\_\_\_\_ .
Select one:
a. Kingsbury
b. Ball bearing 
c. Sleeve bearing
d. Journal bearing
A

b. Ball bearing

49
Q 
If an oil’s viscosity changes a lot with very little temperature change, it will have a:
Select one:
a. Low viscosity index 
b. High pour point
c. High viscosity index
d. Low pour point
A

a. Low viscosity index

50
Q 
The majority of lubricants are:
Select one:
a. Animal fats
b. Synthetic oils
c. Mineral oils 
d. Greases
A

c. Mineral oils

51
Q 
The \_\_\_\_\_ number of oil indicates the acidity of oil.
Select one:
a. Acidity
b. Alkalinity
c. Neutralization 
d. Viscosity index
A

c. Neutralization

52
Q 
The property of oil that indicates its ability to support a load is:
Select one:
a. Viscosity
b. Viscosity index 
c. Pour point
d. Floc point
A

a. Viscosity

53
Q 
Which type of oil produces higher fluid friction?
Select one:
a. High viscosity oil 
b. Low viscosity oil
c. Synthetic oils
d. Fixed oils
A

a. High viscosity oil

54
Q

The lubricant for an anti-friction bearing:
Select one:
a. Will separate the moving parts completely
b. Must be cooled
c. Could be a semi-solid lubricant
d. Should have a high viscosity

A

c. Could be a semi-solid lubricant

55
Q 
Which of the following has the greatest effect on the viscosity of lubrication oil?
Select one:
a. Pressure
b. Load
c. Temperature 
d. Speed
A

c. Temperature

56
Q 
A common cause of antifriction bearing failure is:
Select one:
a. High RPM service
b. Extreme cold temperature cracking
c. Drive motor overload
d. Shaft misalignment
A

d. Shaft misalignment

57
Q 
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
c. Molybdenum disulfide 
d. Sodium carbonate
A

c. Molybdenum disulfide

58
Q 
A thrust bearing which does not utilize the oil wedge principle of lubrication is the:
Select one:
a. Michell type
b. Collar type 
c. Radial type
d. Kingsbury type
A

b. Collar type

59
Q

Grease is not a suitable lubricant:
Select one:
a. If the atmosphere contains a lot of moisture
b. When the atmosphere is dusty
c. If corrosion protection is desired during downtime
d. If a large amount of cooling is desired

A

d. If a large amount of cooling is desired

60
Q 
A collar thrust bearing:
Select one:
a. Can support more load than a Michell thrust bearing
b. Is an anti-friction type bearing 
c. Is used with steam turbines only
d. Has boundary lubrication
A

d. Has boundary lubrication

61
Q 
An anti-friction bearing:
Select one:
a. Is constructed with white metal alloy
b. Wears to a smooth, low-friction surface
c. Has rolling friction 
d. Is a sleeve bearing
A

c. Has rolling friction

62
Q

Large journal or sleeve bearings have grooves:
Select one:
a. In the high pressure area of the bearing babbit
b. Cut into the bearing housing
c. For distributing lubricant evenly just after the pressure area
d. In the non-pressure area

A

d. In the non-pressure area

63
Q

With antifriction bearings using grease, the bearings:
Select one:
a. Must be cleaned twice as often as oil-lubricated bearings
b. can be cleaned by adding solvent to the grease cartridge
c. Are cleaned less often than oil-lubricated bearings
d. Never require cleaning

A

c. Are cleaned less often than oil-lubricated bearings

64
Q 
When grease is used in an antifriction bearing after cleaning, the bearing housing should not be filled \_\_\_\_\_ full.
Select one:
a. more than 1/3 
b. more than 1/2
c. more than 3/4
d. less than completely
A

a. more than 1/3

65
Q

Using pressurized air to blow out a cleaned bearing:
Select one:
a. Should only be done in well-ventilated areas
b. Must be done only while the bearing is hot
c. Will cause the bearing to become “pitted”
d. should be done at an angle so the bearing can spin

A

c. Will cause the bearing to become “pitted”

VIU PWR ENG Part B (18 decks)

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