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Test Review > Bearing and Seals > Flashcards

Bearing and Seals Flashcards

1
Q

With friction bearings, the area of contact is relatively large and the pressure on the material is usually low compared to anti friction bearings.

True or false

A

True

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2
Q

Friction bearings have 3 types of radial loads, which one shifts thru an arc less than 180 degrees?

A

Oscillating

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3
Q

The choice of friction bearing and housing depends on load, rotational speed, support design and _______

A

Direction of pull

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4
Q

A split joint design that can give up to 270 degrees of bearing load (pull from sides and above split) is the ________

A

Gib joint

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5
Q

Journal bearings can either be split or one piece and have metallic liners made of?

A

Babbit and brass

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6
Q

Plastic bearings such as nylon will have?

A thermal expansion rate of 10 times that of metal

A fully saturated water expansion rate of .0256 per inch of material

The ability to run without lubrication

All of the above

A

All of the above

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7
Q

2 of the common babbit bearing alloys are?

A

Tin and lead

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8
Q

A thick walled split bearing with a spherical seat will?

A

Self align its bore with the sag in the shaft decreasing edge loading of the bearing.

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9
Q

Babbit completely melts at _______ degrees C, pours at _______ degrees C, and completely solidifies at _______ degrees C

A

280

370

250

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10
Q

When dealing with Babbit you should NOT?

Have water on the ground or around the pour site

Over heat the Babbit

Use lead unless are is properly ventilated and wearing proper PPE

All of the above

A

All of the above

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11
Q

When fitting a poured Babbitt bearing, you will relieve the corners of the bottom half of the bearing and add an oil groove to the__________?

A

Unloaded area of the bearing

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12
Q

To adjust clearance in the split bearing you would?

A

Take out shims to decrease the clearance

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13
Q

For clearance in a friction bearing the general rule of thumb is .001” clearance per inch of shaft.

True or false

A

True

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14
Q

When using plastic age you must choose the diameter about equal to the bearing clearance, lay it down on the shaft, add cap and once it has been torqued down and then the cap removed, you will measure the___________?

A

The width with a plastigage chart

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15
Q

Crush and spread are built into the liner to help with lubrication? True or false

A

False crush is to set the clearance

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16
Q

Small bushings will have to be ________ to bring the bore to proper diameter?

A

Reamed

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17
Q

When removing plain bearings from a housing, the housing halves should be match marked. True or false

A

True

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18
Q

Use a stone to remove any burrs from the journal and polish it with?

A

Crocus cloth

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19
Q

Always check journal out of round and taper with ________ around the journal and 3 other measurements

A

6 measurements at 60 degrees

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20
Q

A housing fit check is done by adding .005” shims under the bearing cap and using a .006” lead wire on top of the bearing insert. You then replace cap and torque. Then remove cap and measure the lead wire. Wire should measure _________?

A

Same as the shim thickness

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21
Q

Using a hole or telescoping gauge to measure the bore diameter, use a ________ to transfer the measurements to a readable number?

A

Vernier micrometer

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22
Q

When driving a bushing, you should first slightly chamfer the inside and outside edges and then use an adapter with driver, the adapter helps prevent __________ of the bushing?

Improper alignment

Collapsing

Distortion

All of the above

A

All of the above

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23
Q

An ideal area of contact of a plain bearing after scraping would be spots about _______ over an area of _________ the surface?

A

1/8”

85%

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24
Q

End float is controlled by the use of a ________?

A

Thrust bearing

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25
Q

Hydrodynamic bearings need a designated __________ for a given ________ for full film support?

A

Minimum speed

Load

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26
Q

A plain bearing with an unsteady load at high speeds will develop oil whirl.

True or false

A

True

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27
Q

Hydrostatic bearings are found on equipment that operates ___________

A

At a slow speed to form an oil wedge

And with shock loads

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28
Q

Thrust bearings can use direct lubrication and tilting pads to help form the oil wedge.

True or false

A

True

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29
Q

Embedablilty of a bearing material is it’s?

A

Ability to hand contaminants

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30
Q

Lift check is used to check _________ clearance?

A

Radial

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31
Q

Internal and self aligning bearings are used when?

Alignment is impractical

To accommodate angular misalignment when mounting

There are small amounts of shaft wobble

All of the above

A

All of the above

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32
Q

Anti friction bearing cages

Prevent rolling elements from rubbing

Push the rolling elements thru the loaded area

Guide the rolling elements

All of the above

A

All of the above

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33
Q

To load the balls into a Conrad bearing you need to squash the outer ring diameter slightly.

True or false

A

True

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34
Q

When using angular contact bearings in pairs, use the ________ configuration for axial loads in one direction?

A

Tandem

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35
Q

Cylindrical bearings can handle radial loads only.

True or false

A

True

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36
Q

Tapered bearing will need to be _______ to help the rolling elements turn?

A

Preloaded

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37
Q

Carb bearings are used in situations that have some misalignment and axial float.

True or false

A

True

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38
Q

If you had a series 6 bearing it would be a ________?

A

Deep groove ball bearing

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39
Q

If you had a 22208 bearing it would be a __________ and have a bore of__________

A

Double spherical roller bearing

40 mm bore (8x5)

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40
Q

If you had a 6208 K RS bearing the clearance would be _______ ?

A

6 = single row deep groove (bearing style)

2 = light (toughness)

08 = 40mm (bore size. X5 after 03)

K = taper

RS = single rubber seal (seal code)

No bearing clearance designation means normal

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41
Q

A bearing ring subject to a stationary load will have a ______ to allow for creep?

A

Push fit

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42
Q

When inspecting a bearing you find discolouration, that is a sign of?

A

Over heating

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43
Q

Of a bearing being mounted has seals, you would hear it up to _______ degrees c if not sealed you heat it up to _______ degrees C

A

80

120

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44
Q

Mounting separable cylindrical bore bearings and needle bearings with no no inner ring, you will need to use _______ to aid in installation?

A

Guide Mandrels

Guide sleeves

Slight chamfers on shafts

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45
Q

To find the clearance on spherical roller bearings you can use feeler gauges.

True or false

A

True

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46
Q

Residual clearance is measured when

A

After it is mounted

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47
Q

When using the turning angle for axial drive up of tapered bore bearings with adapter sleeves, the large the shaft the larger __________

A

Turning angle

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48
Q

When using oil injection to dismount a tapered bot bearing, you should back off the retaining nut but not remove it.

True or false

A

True

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49
Q

Welding is done on bearings outer ring (when in a housing) to _________ to help in the removal of the ring.

A

Shrink the ring

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50
Q

If a bearing runs at a temperature above 55 degrees C, ___________ will occur

A

Rapid oxidation

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51
Q

If shaft runout is more than .001” or bearing seat wear exceeds .005” they need to be straightened fixed or replaced.

True or false

A

True

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52
Q

Brinelling is?

A

Impact denting

53
Q

Imbalance and misalignment are the two main causes of vibration in bearings.

True or false

A

True

54
Q

Fatigue in bearings will result in?

A

Micro cracks in or under surfaces

Pitting of surfaces

Flaking of surfaces

55
Q

Improper selection of a bearing will include wrong clearances, material or type.

True or false

A

True

56
Q

Hydrostatic lubrication uses pressure instead of speed to force the oil or film into the loaded area of the bearing.

True or false

A

True

57
Q

One advantage of grease over oil is?

A

Better sealing capabilities

58
Q

If you have excess grease or oil in a bearing you will get an increase in temperature of the bearing when running.

True or false

A

True

59
Q

When removing a withdrawal sleeve, you will tighten a withdrawal nut that fastens to the sleeve and pushes against the?

A

Bearing inner ring

60
Q

How many fixed bearings are on a line shaft? Where are they located?

A

1

At the drive unit

61
Q

If you mounted tandem angular contact bearings backward, the load would __________ supported in the direction intended?

A

Not be

62
Q

When replacing bearings on a reduction unit, it is important to make sure the bearing cover is properly orientated to allow proper oil drainage.

True or false

A

True

63
Q

When installing a seal on a bearing housing, this would be called a ?

A

External seal

64
Q

A static seal seals between?

A

2 stationary parts

65
Q

A seal that controls leakage is call a non positive seal.

True or false

A

True

66
Q

A lip seal uses _______ and ________ to help seal before start up and ________ after startup.

A

Garter spring and resilience of lip material

Lubricant and gas pressure

67
Q

A V-ring seal is?

Attached to the shaft

Seals against contamination with a Flinger action

Seals agains a smooth surface on the housing

All of the above

A

All of the above

68
Q

An external non rubbing seal that uses a tongue and groove design and a torturous path to help keep contaminants out is the _________ seal?

A

Labyrinth

69
Q

To help pillow block bearings maintain there position, you would use key stock welded to the ends and/or slides of the pillow block, depending on the action of the load.

True or false

A

True

70
Q

Compression packing is squeezed in a confined space by the ______?

A

Gland follower

71
Q

Automatic packing?

Is cup packing

Has an interference fit on the cylinder walls

Has system pressure to help aid in sealing

All of the above?

A

All of the above

72
Q

Most of the wear on shafts from compression packing is located?

A

At the outer two rings of packing

73
Q

Radial wound packing is wrapped around the shaft until it’s OD just fits into the stuffing box?

True or false

A

True

74
Q

Spiral wound packing is installed to shaft rotation.

True or false

A

True

75
Q

When the lantern ring is used for cooling and sealing out harmful chemicals from the pumping medium, the lantern ring would be located under the seal water (at 10-15 psi above the pump) connection and at the?

A

Bottom of the stuffing box

76
Q

Once the packing is installed in the stuffing box and has been seated and allowed to expand, you will _________ nuts, start pump and allow packing to leak freely, than gradually tighten gland nuts until you get a controlled leakage of________ per minute?

A

Finger tighten nuts

And 60 drops per minute

77
Q

Mechanical seals are located there the leakage of the dangerous product cannot be tolerated.

True or false

A

True

78
Q

Mechanical seals are made up of 4 basic components. Which of the following is not one of them?

Primary seals

Secondary seals

Shaft packing or insert mounts

Saturated

A

Saturat

79
Q

The primary seal of a mechanical seal is aided by product pressure and?

Springs

Bellows

Lubrication between mating faces

All of the above

A

All of the above

80
Q

If you saw spiral grooves on one of its faces it would be?

A

Gas lubricated seal

81
Q

The primary sealing point of a mechanical seal is between the?

A

Rotating and the stationary seal mating faces

82
Q

o-rings are used in both static and dynamic applications in mechanical seals are?

A

Secondary seals

83
Q

A pusher seal uses _______ to help aid sealing?

Single spring

Multiple string

Bellows

Both A and B are correct

A

Both A and B are correct

84
Q

There are two ways to drive the rotating ring on mechanical seals. They are Are?

A

Mechanical

And

Friction

85
Q

Gland jackets come with connections for internally or externally supplied fluid for _______

Flushing

Quenching

Lubricating

Alll off above

A

All of the above

86
Q

Bypass flushing is when________,

A

The pumping medium is used to remove heat

87
Q

Barrier systems uses a barrier fluid admitted between the 2 seals of a double seal, the pressure is?

A

Higher then the pumping medium

88
Q

The main difference between balanced and unbalanced seals?

A

Face loading is minimized on balanced

89
Q

When rotational speeds exceed 4500/min, you will need a rotating seal with a?

A

Stationary seal

90
Q

If the pumpuge comes in contact with the springs and collars and the O.D of single seals is exposed to the pumpage?

A

Inside mounted seal

91
Q

On double mechanical seals, if you used a buffer fluid instead of a barrier fluid, it would be called a?

A

Tandem seal

92
Q

On back to back dual seals, the 2 rotating seals face away from each other to keep out the pumping medium, also the barrier fluid:

Should be 10% higher than the stuffing box

Should be compatible with the pumping fluid

Needs to lubricate the seals

All of the above

A

All of the above

93
Q

To help simplify mechanical seal installation, cartridge seals are used.

True or false

A

True

94
Q

Do not lubricant the seal faces and avoid touching them.

True or false

A

True

95
Q

When installing a mechanical seal you will first scribe a line on the shaft to indicate the seal housing face, than from the seal housing face line, measure and scribe the seal setting point, which is where the seal locking devices will be locked to the shaft to give the seal faces their required loading.

True or false

A

True

96
Q

When inspecting and troubleshooting mechanical seals, if the wear pattern on the stationary seal is wider than the diameter and width of the rotation seal face, it is an indication that there is?

A

Pump misalignment

97
Q

If the seal faces have chips, it is a sign of?

A

The liquid flashing of vapours

98
Q

On a lip seal, if the lip is sealing out contamination the lip faces in or out?

A

Out

99
Q

When dealing with gaskets and piping, it is a must to make sure that all pumps and piping are:

A

Locked out

Purged

Blinded

100
Q

Gaskets are used to seal between 2 surfaces and need to __________ to positively seal?

A

Fill voids and irregularities

Be under more pressure than the sealed fluid

Handle internal and hydrostatic end force

101
Q

Solid metal ring gaskets of the delta, oval and octagonal design do NOT need high bolt loading to seal.

True or false

A

True

102
Q

Gasket thickness is critical because internal alignment and clearances can be changed.

True or false

A

True

103
Q

The advantage of a flat ring gasket over full face gasket?

A

Easier removal from the flange

104
Q

Spiral wound gaskets are used for high pressure and temperature applications.

True or false

A

True

105
Q

When making gaskets, you need to know the:

A

O.D

I.D

Bolt hole spacing

Bolt circle diameter

106
Q

When using the angle method of finding the bolt hole spacing, you divide 360 degrees by the number of spaces needed to match the bolt holes in the ________?

A

Flange

107
Q

When making the bolt holes in the gasket, they should be?

A

Slightly larger than the bolt diameter

108
Q

When cutting gaskets, you should use a softer material such as wood under the gasket when punching holes.

True or false

A

True

109
Q

If you find a gasket that is breaking into pieces, it would be a sign of?

A

Gasket was the wrong type

Or

Installation procedure was wrong

110
Q

To help transfer the flange shape to the gasket material you can use Persian blue.

True or false

A

True

111
Q

When scraping a gasket, make sure to scrape away from you and do NOT damage the sealing surfaces.

True or false

A

True

112
Q

When making a gasket with a hammer and housing l, avoid damaging the flange edges and bolt hole edges.

True or false

A

True

113
Q

When torquing the bolts down on the flange, it is more efficient to take 2 or 3 passes around the bolt sequence to get the full clamping pressure required.

True or false

A

True

114
Q

O-rings require 10% of crush for static applications.

True or false

A

True

115
Q

Hardening sealants are:

Flexible

Ridged

All of the above

A

All of the above

116
Q

If you see a stuffing box code that reads 4-L2-G, this means what?

A

4 rings of packing

Lantern ring

2 rings of packing

Gland

117
Q

When cutting packing use a wooden mandrel of the same diameter as the shaft. Wrap packing around it then cut it off with a butt or diagonal cut.

True or false

A
118
Q

When installing packing it is the utmost importance to use a s-twist to put on a rigid packing. Stagger the joints 90degrees and if stuffing is bulged use a roller gently to flatten out the packing

True or false

A

True

119
Q

V ring packing in on a double acting cylinder should oppose each other.

True or false

A

True

120
Q

Cup packing is considered an unbalanced packing and should have a rigid separator between the two cups when used on double acting pistons.

True or false

A

True

121
Q

Back up Rings for O-rings help stop extrusion of the O-ring into the gap when exposed to high pressure.

True or false

A

True

122
Q

When installing o-rings onto a shaft, protect the o-ring by adding a shaft sleeve and rolling the o-ring into place.

True or false

A

True

123
Q

Floating packing is allowed to move in a groove and seal by the means of spring tension.

True or false

A

True

124
Q

Lip seals are used in low pressure 2-10psi and need lubrication on the lip to seal.

True or false

A

True

125
Q

In an emergency (for lip seals), you can _________ to accommodate to shaft wear under the lip of the seal?

A

Change the seal to a wider one

Reverse the seal

Install a spacer behind the seal

Install a thin sleeve over the worn part

126
Q

Wipers are used to?

A

Clean the shaft of foreign materials

Expel foreign materials away from the seals

Allow lubricants from the equipment to remain on the rod

127
Q

If the wear pattern on the mechanical seal is limited to .005” in depth you can use a course diamond impregnated plate to remove the patter using a back and forth motion.

True or false

A

True

128
Q

When doing a final step of polishing, use a 6 micron diamond impregnated plate and figure 8 pattern when moving seals on the surface.

True or false

A

True

129
Q

If the light band patterns on the seal surfaces have straight lines this means the surfaces are flat.

True or false

A

True

Test Review (17 decks)

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