Unit 1 Lubrication and bearings Flashcards
(80 cards)
1
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
2
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”
3
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
4
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
5
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
6
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
7
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
8
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
9
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
10
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
11
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
12
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
13
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
14
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
15
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
16
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
17
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
18
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
19
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
20
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
21
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
22
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”
23
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
24
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
25
```
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
```
d. Is used for heavy loads
26
```
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. Low viscosity index
27
```
A journal(Shaft) bearing:
Select one:
a. Controls thrust movement
b. Does not require lubrication
c. require cooling water
d. Supports a shaft
```
d. Supports a shaft
28
```
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
```
b. Have low carbon residue
29
```
Where gear teeth inter-mesh, a lubricant must provide
Select one:
a. Corrosion prevention
b. Sealing
c. Shock absorption
d. Temperature control
```
c. Shock absorption
30
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. Not be transmitted through the bearing balls
31
```
The majority of lubricants are:
Select one:
a. Animal fats
b. Synthetic oils
c. Mineral oils
d. Greases
```
c. Mineral oils
32
```
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
```
d. Viscosity
33
```
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
```
c. 1.25 cm
34
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
d. If a large amount of cooling is desired
35
```
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
```
b. Specialty grease
36
```
The cheapest and most commonly used grease is:
Select one:
a. Potassium base
b. Chlorine base
c. Lime base
d. Sulphate base
```
c. Lime base
37
```
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
```
c. Has rolling friction
38
```
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
```
b. Be fire resistant
39
```
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
```
d. Brinelling
40
```
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
```
b. Pour point depressant
41
```
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
```
d. Viscosity
42
```
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
```
b. Collar type
43
```
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
```
b. Pour point depressant
44
```
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
```
d. Fluid film lubrication
45
```
A material that is commonly used as a solid lubricant is:
Select one:
a. Tallow
b. Lime
c. Molybdenum disulfide
d. Sodium carbonate
```
c. Molybdenum disulfide
46
```
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. Solid
47
```
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
```
c. Supports heavy loads
48
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
d. Can be used under conditions where oil may leak away and leave the bearing dry
49
```
Which of the following has the greatest effect on the viscosity of lubrication oil?
Select one:
a. Pressure
b. Load
c. Temperature
d. Speed
```
c. Temperature
50
```
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
```
b. Have low carbon residue
51
```
The _____ number of oil indicates the acidity of oil.
Select one:
a. Acidity
b. Alkalinity
c. Neutralization
d. Viscosity index
```
c. Neutralization
52
```
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. Viscosity
53
```
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
```
d. Brinelling
54
```
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. High viscosity oil
55
```
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
```
b. Specialty grease
56
```
The majority of lubricants are:
Select one:
a. Animal fats
b. Synthetic oils
c. Mineral oils
d. Greases
```
c. Mineral oils
57
```
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
```
c. 1.25 cm
58
```
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
```
b. Be fire resistant
59
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
c. Are cleaned less often than oil-lubricated bearings
60
```
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. Have a low pour point
61
```
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
```
c. 65°C to 70°C
62
```
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
```
d. Shaft misalignment
63
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
c. Will cause the bearing to become “pitted”
64
```
Where gear teeth inter-mesh, a lubricant must provide
Select one:
a. Corrosion prevention
b. Sealing
c. Shock absorption
d. Temperature control
```
c. Shock absorption
65
```
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. Low viscosity index
66
```
A type of anti-friction bearing is the _____ .
Select one:
a. Kingsbury
b. Ball bearing
c. Sleeve bearing
d. Journal bearing
```
b. Ball bearing
67
```
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
```
b. Hydraulic pressure
68
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
d. If a large amount of cooling is desired
69
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
b. Loosening the bearing caps
70
```
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. Its thickening agent or “soap”
71
```
A journal bearing:
Select one:
a. Controls thrust movement
b. Does not require lubrication
c. require cooling water
d. Supports a shaft
```
d. Supports a shaft
72
```
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
```
b. Are capable of sealing out dirt and water from bearings
73
```
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
```
d. A rust preventative
74
```
Which of the following has the greatest effect on the viscosity of lubrication oil?
Select one:
a. Pressure
b. Load
c. Temperature
d. Speed
```
c. Temperature
75
```
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
```
d. Has boundary lubrication
76
```
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
```
d. Fluid film lubrication
77
```
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
```
b. A Saybolt viscometer
78
```
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
```
d. Is used for heavy loads
79
```
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
```
b. Roughness
80
```
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
```
c. Fire
