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millwright level 2 test questions from teacher > bearings and seals / packing test > Flashcards

bearings and seals / packing test Flashcards

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1
Q

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

true

False

A

true

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2
Q

friction bearings have 3 types of radial loads. which on shifts thru an arc less than 180 degrees

stationary

ocillating

reciprocating

alternating

A

oscillating

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3
Q

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

direction of pull

rubbing speed

shaft size

bearing material

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_______

angle

4 bolt split

flat joint

gib joint

A

gib joint

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5
Q

journal bearings can be either split or one piece (bushing) and have metallic liner materials made of

babbitt

brass

nylon

phenol laminates

both the 1st and 2nd answers are correct

all the above

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 steel

a fully staurated water expansion rate of 0.0256” per inch of material

the ability to run without lubrication

all the above

A

all of the above

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7
Q

2 of the common babbit bearing alloys are

tin, brass

bronze, lead

tin, lead

aluminium, antimony

A

tin and lead

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8
Q

a thick walled construction split bearing with a spherical seat will

self align its bore with the sag in the shaft decreasing the bearings load capacities

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

be used on light load applications

be made of sintered bronze

A

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

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9
Q

babbitt completely melts at ______degrees C, pours at __________degrees C, completely solidifies at ________ degrees C.

280, 370, 250

370, 450, 350

280, 370, 340

180, 250, 220

A

babit melts at 280
pours at 370
solidifies at 250

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10
Q

when dealing with babbitt, you should not

have water on or around the area where the pour is taking place

over heat the babbitt

use lead unless area is properly vented and wearing proper PPE

all the above

A

all 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 sides

to the top

to the unloaded area of the bearing

to the loaded area of the bearing

A

to the unloaded side

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12
Q

for cleance in friction bearings, a general rule of thumb is - 0.001” clearance per inch of shaft diameter

true

False

A

true

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13
Q

to adjust the clearance in a split plain bearing, you would

add shims to the joint to decrease the clearance

take out shims to decrease the clearance

scrape bearing in loaded section

scrape bearing in unloaded section

A

take out shims to decrease the clearance

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14
Q

when using plastigage, 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

thickness with a micrometer

width with a vernier caliper

the thickness with a plastigage chart

the width with a plastigage chart

A

the width of the plastic gauge chart

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15
Q

crush and spread are built into the bearing shell to help lubricate the bearing liner

true

False

A

false

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16
Q

when removing plain bearings from a housing, the housing halves should be match marked for proper installation

true

False

A

true

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16
Q

small bushings will have to be ______ to bring the bore to the proper diameter

drilled

machined

reamed

none of the above

A

reamed

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17
Q

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

emery cloth

crocus cloth

sand paper

draw filing

A

crocus cloth

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18
Q

always check the shaft straightness and the journal for out of round and taper. to do this, you would take _______measurements________ degrees apart around the journal. you would make these measurements at ____ different points along the journals length

3, 120, 3

6, 60, 3

3, 120, 6

3, 60, 3

A

3,120,3

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19
Q

a housing fit check is done by adding 0.005” shims under the bearing cap and using a 0.006” lead wire on top of the bearing insert. you then replace cap and torque. when cap is removed the lead wire should measure_________

the same clearance as in the bearing

1 or 2 mils

the same as the shim thickness

any of the above

A

the same as the shim thickness

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20
Q

use a hole or telescoping gauge to measure bore diameters. use a ___________ to transfer the measurements to a readable number

vernier caliper

tape measure

inside caliper

vernier micrometer

A

vernier micrometer

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21
Q

when driving in a bushing, you should first slightly chamfer the inside and outside edges and then use an adapter with adriver. the adapter helps prevent _________ of the bushing

improper alignment

collapsing

distortion

all the above

A

all the above

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22
Q

an ideal area of contact of a plain bearing after scraping would be spots about ____ over an area of ____ of the surface

1/16”, 50 %

1/8”, 50 %

1/8”, 85 %

1’\/16”, 85%

A

1/8th ,85%

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23
Q

end float is controlled by the use of a

radial plain bearing

thrust bearing

bushing without a collar

all the above

A

thrust bearing

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24
Q

hyrodynamic bearings need a designated________ for a given _____ for full film support

minimum speed, load

maximum speed, load

minimum speed, shaft size

maximum speed, shaft size

A

minimum speed, load

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25
Q

a plain bearing with an unsteady load at high speed will develope oil whirl

true

false

A

true

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26
Q

hydrostatic bearings are found on equipment tht operates ___________

at to slow a speed to form an oil wedge

with shock loads

at high speeds

the 1st and 2nd answers are correct

A

at to low a speed to form an oil wedge and with shock loads

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27
Q

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

true

False

A

true

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28
Q

embedability of a bearing material is its

resistance to cracking

ability to support shaft loads

ability to retain a film of lubrication

ability to handle contaminants

A

ability to handle contaminants

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28
Q

a lift check is used to check___________clearance

axial

radial

initial

A

radial

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29
Q

internal and external self-aligning bearings are used when

alignment is impratical or impossible to maintain

to accommodate angular misalignment when mounting

the are small amounts of shaft wobble

all the above

A

all the above

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30
Q

to load the balls into a conrad bearing you need to squash the outer rings diameter slightly

true

false

A

true

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31
Q

antifriction bearings have cages that ______________

prevent the rolling elements from rubbing

push the rolling elements thru the unloaded zone

guide the rolling elements

all the above

A

all the above

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32
Q

when using angular contact bearings in pairs, use the______________ configuration for axial loads in one direction

face to face

back to back

tandem

A

tandem

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33
Q

cylindrical roller bearings can handle radial loads only

true

false

A

true

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34
Q

tapered roller bearings will need to be ______________ to help the rolling elements turn

clearance

a shrink fit

force fit

preloaded

A

pre loaded

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35
Q

carb bearings are used in situations that have some mislaignment and axial float

true

False

A

true

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35
Q

if you had a bearing number of 6208 K RS, the clearance would be

C-2

less than standard

standard

more than standard

A

standard

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36
Q

if you had a series 6 bearing, it would be a ____________ bearing

tapered roller

ball thrust

deep groove ball

spherical roller

A

deep grove ball

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37
Q

if you had a 22208 bearing, it would be a ________ and have a bore of _______

double spherical roller, 40 mm

double ball, 8 mm

single cylindrical, 40 mm

single deep groove, 8 mm

A

double spherical roller 40 mm

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38
Q

a bearing ring subject to a stationary load will have a/an__________ to allow for creep

interference fit

press fit

push fit

force fit

A

push fit

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39
Q

if a bearing being mounted has seals, you would heat it up to _____ or if not sealed, heat to_______

120 c, 80 c

120 c, 120 c

80 c, 120 c

175 c, 250 c

A

80c for seals
120 if not sealed

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40
Q

when inspecting bearings, you find discoloration, this is a sign of

contamination

overloading

overheating

fatigue

A

over heating

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41
Q

residual clearance is measured

before it is mounted

after it is mounted

after it is running

any of the above

A

after its been mounted

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42
Q

mounting separable cylindrical bore bearings and needle bearings with no inner ring, you will use________to aid in installation

guide mandrels

guide sleeves

slight chamfers on shafts

all the above

A

guid mandrels
guide sleeves
slight chamfer on shaft

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43
Q

to find the internal clearance on a spherical roller bearing, you can use feeler gauges

true

false

A

true

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44
Q

when using the turning angle for axial drive up of tapered bore bearings with adapter sleeves, the larger the shaft will have

the smaller the turning angle

the larger the turning angle

the turning angle should be the same for all sized bearings

smaller than the bearing

A

the larger turning angle

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45
Q

when using oil injection to dismount a tapered bore bearing, you should back off the retaining nut (do not remove it)

true

False

A

true

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46
Q

if shaft runout is more than 0.001” or bearing seat wear exceeds 0.0005”, they need to be straightened, fixed or replaced

true

False

A

true

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46
Q

welding is done on a bearings outer ring (when in a housing) to _______________to help in the removal of the ring

expand the ring

to shrink the ring

melt the ring

none of the above

A

shrink the ring

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47
Q

if a bearing runs at a temperature higher than 55 degrees C, __________ will occur

rapid oxidation

temperatures will decrease

longer bearing life

full film strength

A

rapid oxidation

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48
Q

brinelling is

impact denting

spalling

fretting

fatigue

A

impact denting

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49
Q

imbalance and misalignment are the 2 main causes of vibration in bearings

true

false

A

true

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49
Q

improper selection of a bearing will include, wrong clearance, material or type

true

false

A

true

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50
Q

fatigue in bearings will result in

micro cracks in or under surfaces

Option 2pitting of surfaces

flaking of surfaces

all the above

A

all the above

51
Q

if you have excess grease or oil in a bearing housing you will get a increase in temperature of the bearing when running

true

False

A

true

51
Q

hydrostatic lubrication uses pressure instead of speed to force the oil film into the loaded area of the bearing

true

false

A

true

52
Q

one advantage that grease has over oil is

faster running speeds

lower running temperatures

better sealing capabilities

removes contaminants

A

better sealing capabilities

53
Q

when removing a withdrawal sleeve from a bearing, you will need a withdrawal nut that fastens to the sleeve and pushes against the_____________________

bearing outer ring

bearing inner ring

both the inner and outer ring

the withdrawal nut fits onto the shaft and pushes on the withdrawal sleeve

A

the withdraw nut fits onto the shaft and pushes on the withdrawal sleeve

54
Q

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

true

false

A

true

54
Q

how many fixed bearings are on a line shaft and where would it/they be located.

1, any where

2, one, each end

1, at the drive end

2, at the drive end and by a sprocket

A

1 at the drive end

55
Q

if you mounted tandem angular contact bearings backward, the load would ___________supported in the direction intended

not be

be

would stay the same as there is no difference the way they are mounte

A

not be

56
Q

when installing a seal on a bearing housing, this would be called a

shield

integral seal

external seal

contact

A

external seal

56
Q

a static seal seals between

2 moving parts

1 moving part and 1 stationary part

2 stationary parts

both the 2nd and 3rd answers are correct

A

2 stationary parts

56
Q

a seal that controls leakage is called a non-positive seal

true

false

A

true

56
Q

a lip seal uses a _____ to help seal before startup and ___________after startup

garter spring, retaining ring

garter spring, resilience of the lip material

garter spring, resilience of the lip material, whirling lubricant and gas pressure

none of the above

A

garter spring resilience of the lip material , whirling lubricant and gas pressure

57
Q

a v-ring seal

is attached to the shaft

seals against contaminants with a flinger action

seals against a smooth surface on the housing

all the above

A

all the above

58
Q

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

single lip seal

shield seal

labyrinth seal

felt seal

A

labyrinth seal

59
Q

to help pillow block bearings maintain thier position, you would use keystock welded to the ends and/or sides of the pillow block, depending on the action of the load(s)

true

false

A

true

60
Q

compression packing is squeezed in a confined space by the

water pressure

expansion of the packing

gland follower

centrifugal force

A

gland follower

60
Q

automatic packing

is cup packing

has an interference fit on the shaft or cylinder walls

has system pressure help aid in sealing

all the above

A
61
Q

most of the wear on shafts from compression packing is located

at the inner 2 rings of packing

at the outer 2 rings of packing

equal on all rings of the packing

next to the pump

A

the outer 2 rings of packing

62
Q

radial wound packing is wrapped around the shaft until it’s O.D. just fits into the stuffing box

true

False

A

true

63
Q

when th 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 a pressure 10-15 psi above the pump) connection and at the

top of the stuffing box

bottom of the stuffing box

in the middle of the stuffing box

it does not matter, it will work equally as well in any spot

A

bottom of stuffing box

63
Q

spiral wound packing is installed so it will correspond to shaft rotation

true

False

A

true

64
Q

mechanical seals are used where leakage of the dangerous product cannot be tolerated

true

False

A

true

64
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 till you get a controlled leakage of_________drops per minute

finger tighten, 100 to 200

fully tighten, 40-60

finger tighten, 40-60

fully tighten, 100-200

A

finger tighten 40-60 drops per minute

65
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

saturant

A

saturant

66
Q

the primary sealing point of mechanical seals is between the

shaft and sleeve

rotating and stationary seal mating faces

rotating seal and shaft

stationary seal and the housing

A

rooting and stationary seal mating face

67
Q

the primary seal of the mechanical seal is aided by product pressure and

springs

bellows

lubrication between mating faces

all the above

A

all the above

68
Q

if you saw a mechanical seal with spiral grooves on one of its faces, it would be

would be a water lubricated seal

gas lubricated seal

you would not see a seal like this

none of the above

A

gas lubricated seal

69
Q

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

primary seals

secondary seals

complimentary seals

all the above

A

secondary seals

70
Q

a pusher seal uses ______________ to help aid sealing

a single spring

multiple springs

bellows

the 1st and 2nd answers are correct

A

a single spring and multiple springs

70
Q

there are 2 ways to drive the rotating ring on a mechanical seal. they are

mechanical, friction

mechanical, pins

friction, o-rings

clamping, friction

A

mechanical and friction

70
Q

gland jackets come with connections for internally or externally supplied fluid for

flushing

quenching

lubricating

all the above

A

all the above

71
Q

bypass flushing is when

an outside source of fluid is used

the pumping medium is used to remove heat

an external source fluid has a higher pressure than the seal chamber

the pumping medium is kept out of the chamber

A

the pumping medium is used to remove heat

72
Q

barrier systems use a barrier fluid admitted between the 2 seals of a double seal. the pressure is

higher than the pumping medium

lower than the pumping medium

the same pressure of the pumping medium

none of the above

A

higher than the pumping medium

72
Q

the main difference between balanced and unbalanced mechanical seals is

face loading is minimized on unbalanced

face loading is minimized on balanced

leakage is greater on unbalanced

leakage is less on balanced

A

face loading is minimized on balanced

73
Q

when rotational speeds exceed 4500ft/min, you will replace a rotating seal with a

unbalance seal

balanced seal

stationary seal

compression packing

A

stationary seal

74
Q

when if the pumpage comes in contact with the springs and collars and the O.D of single seals is exposed to the pumpage it is classified as a/an

outside mounted seal

inside mounted seal

double lip seal

v-ring seal

A

inside mounted seal

74
Q

to help simplify mechanical seal installation, cartridge seals are used

true

False

A

true

74
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 pressure

should be compatible with the pumping fluid

needs to lubricate the seals

all the above
Correct

A

all the above

75
Q

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

dual seal

tamdem seal

modified double seal

any of the above

A

tandem seal

75
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

false

A

true

76
Q

do not lubricate the seal faces and avoid touchung the seal faces

true

false

A

true

77
Q

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

locked out

purged

blinded

all the above

A

all the above

77
Q

when inspecting and troubleshooting mechanical seals, if the wear pattern on the stationary seal is wider than the diameter and width of the rotating seal face, it is an indiction that

all is well with the sealing faces

there is pump misalignment

shock loading

there are high temperatures

A

pump misalignment

78
Q

if the seal faces have chips, this is a sign of

high temperatures

pump missalignment

the liquid flashing to vapour

o-rings swelling

A

liquid flashing to vapour

79
Q

on a lip seal, if the lip is sealing out contamination, the lip faces

in

out

does not matter

A

out

80
Q

solid metal ring gaskets of the delta, oval and octagonal ring design do not need high bolt loading to seal

true

False

A

true

81
Q

gaskets are used to seal between 2 surfaces and need to ______________to positively seal

fill voids and irregularities

be under more pressure than the sealed fluid

handle internal and hydrostatic end force

all the above

A

all the above

82
Q

gasket thickness is critical because internal alignment and clearances can be change

true

false

A

true

83
Q

the advantage of flat ring gaskets over full face gaskets

better sealing

easier removal from the flange

more flexible

a larger O.D.

A

easier removal from the flange

84
Q

spiral wound gaskets are used for high pressure and temperature applications

true

false

A

true

85
Q

when making a gasket you need to know the

the O.D.

I.D.

bolt hole spacing and bolt circle diameter

all the above

A

all the above

85
Q

when using the angle method of finding the bolt hole spacing, you would divide 360 degrees by the number of spaces needed to match the bolt holes in the _________________

flange

flange plus 1

flange minus 1

none of the above

A

flange

86
Q

when making the bolt holes in the gasket, they should be

sightly smaller than the bolt diameter

slightly larger than the bolt diameter

size on size of the bolt diameter

A

slightly larger than the bolt diameter

87
Q

if you find a gasket, that is being replace, breakin into pieces, this would be a sign

the gasket was the wrong type

the installation procedure was wrong

both the first and 2nd answers are correct

A

wrong gasket wrong installation procedure

87
Q

when cutting gaskets, you would use a softer material such as wood under the gasket when puching holes

true

false

A

true

88
Q

to help transfer the flange shape to the gasket material, you can use prussian blue

true

false

A

true

89
Q

when scraping a gasket, make sure to scrape away from you and do not damage the sealing surfaces

true

false

A

true

89
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 to the full clamping pressure required

true

false

A

true

90
Q

o-rings for static applications require a crush amount equal to 10 % of thier diameter

true

false

A

true

91
Q

hardening sealants are

flexible

rigid

all of the above

A

all the above

92
Q

packing installed in the stationary unit is called inside packed

true

False

A

true

93
Q

if you see a stuffing box code that reads 4-L 2-G, this means

4 rings of packing, lantern ring than 2 rings of packing and than the gland

2 rings of packing, lantern ring, 4 rings of packing and than the gland

4 rings of packing, lubrication, 2 rings of packing than the gland

A

4 rings of packing, lantern ring than 2 rings of packing and than the gland

94
Q

when cutting packing use a wooden mandrel of the same size as the shaft and wrap packing around it and then cut it either with a butt cut or diagonal cut

true

false

A

true

95
Q

when installing packing it is of the utmost importance to use a s-twist to put on rigid packin, stagger the joints 90 degrees and if stuffing is bulged, use a roller to flatten packing slightly

true

False

A

true

96
Q

v-ring packing sets used on double acting cylinders should face each other

true

false

A

true

97
Q

cup packing is considered an unbalanced packing and should have a rigid separator between the 2 cups when used on double acting pistons

true

False

A

true

98
Q

lip seals are used in low pressure areas (2 to 10 psi) and do not need lubrication on the lip to seal

true

false

A

false

98
Q

back-up rings for o-rings help stop extrusion of the 0-ring into the gap when exposed to high pressures

true

false

A

true

99
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

false

A

true

99
Q

floating packing is allowed to move in a groove and seal by means of spring tension

true

False

A

true

100
Q

wipers are used to

clean the shaft or foreign materials

expel foreign materials away from the seals

allows lubricant from the equipment to remain on the rod

all the above

A

all the above

100
Q

in an emergency, (for lip seals) you can ________________ to accomadate for shaft wear under the lip of the seal

change the seal to a wider seal

reverse the seal

install a spacer behind the seal

install a thin sleeve over the worn spot

all the above

A

all the above

101
Q

if the wear pattern on the mechanical seal is limited to 0.005” in depth you can use a course, diamond impregnated plate to remove the pattern using a back and forth motion

true

false

A

true

102
Q

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

true

False

A

true

103
Q

what type of bearing is this

A

plain split thin shell

104
Q

if the light band patterns on the seal surfaces have straight lines, this means the seal faces are not flat

true

False

A

false

105
Q

what type of bearing is this

spherical roller

cylindrical roller

tapered roller

cylindrical thrust

A

tapered roller bearing

106
Q

what type of bearing is this

needle

tapered roller

needle thrust

none of the above

A
107
Q

what type of bearing is this

pillow block

flanged eccentric locked

cartridge

flanged set screw locked

A

flanged set screw locked

108
Q

what type of bearing is this

deep groove ball bearing

loading slot ball bearing

angular contact ball bearing

brass cage roller bearing

A

anger contact bearing

109
Q
A

millwright level 2 test questions from teacher (6 decks)

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