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millwright level 2 > bearings test teacher questions > Flashcards

bearings test teacher questions Flashcards

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1
Q

This type of bearing is used for drives where the load is applied, parallel to or slightly above the horizontal

A

angle bearing

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2
Q

Name two basic types of bearings used

A

Friction and anti-friction bearings

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3
Q

Friction bearings are also referred to as?

A

plain bearings sleeve bearings and journal bearings

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4
Q

Anti-friction bearings have a rolling contact between the shaft and bearing using?

A

Balls, needles or rollers

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5
Q

bearing housings are made from what materials ?

A

cast iron - general use light-medium loads
cast steel- general use light-heavy loads
fabricated steel- special jobs

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6
Q

This type of bearing is used for drives were the load is applied parallel to or slightly above horizontal

A

angle bearing

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7
Q

This bearing combines the rigidity of a solid block with the advantage of split construction and a suitable for sideloading

A

gib joint bearing

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8
Q

I have the liner materials available for bearings to the millwright. What is the only one that can be handled from start to finish without requiring machine shop preparation?

A

babbit

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9
Q

What type of Berean uses a shaft itself as a bearing in a ring

A

needle bearings

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10
Q

What type of antifriction bearing is generally suited to high-speed applications

A

ball bearing

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11
Q

Bearings may have either a straight or tapered for standard taper, has a ratio of?

A

1:12
k 30 means 1:30 ( very large bearings)

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12
Q

Variance having a tapered board, will have their code number with what letter

A

K indicates a tapered bore

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12
Q

What type of bearing would be used by the lubricant in a bearing is to be kept in the Bearing

A

sealed bearing

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13
Q

The space left in the bearing after installing it on the shaft or in a housing or the space left in a taper bore bearing that has been forced up to taper is called?

A

installed clearance

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14
Q

The term Babbitt includes several all the ways that contain various propositions of

A

tin
copper
lead

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15
Q

Depending on the Alloy , when pouring a bearing, the temperature of Babbitt should be between

A

650 f-700f

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16
Q

In a Babbitt, bearing what prevents the bad it from, turning, and holds it firmly against the casting?

A

keys

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16
Q

A short smooth piece of dummy shaft is used to take up the space of the original shaft in the machine during the Babbitt poor what is the dummy shaft called?

A

mandrel

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16
Q

Do not pour Babbitt into a bearing assembly that has not been heated first to remove any free water or surface, moisture, free, water, or or moisture will cause

A

blow back

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17
Q

In the Babbitt, bearing the corners of the bottom, half of the Bearing must be?

A

relieved

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18
Q

What material is used with checking a Babbitt bearing for contact

A

Prussian blue

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19
Q

When cutting oil or grease grooves in a babbit bearing, where should they be located?

A

bearing cap (unloaded section)

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20
Q

To firmly attach a thin skin of babbit material to a metallic backing you must perform this operation

A

tinning

21
Q

When Bearing shells are first install, they frequently extend past the face of the bearing buy a small amount, which is known as

A

crush

22
Q

Rust control, and friction variance is obtained by bearing design or

A

shaft collar

22
Q

What force does the Kingsbury thrust bearing depend on for complete lubrication?

A

centrifugal force

23
Q

This occurrence in and antifriction bearing changes the contact area on the raceway and extends the service life of the Bearing

A

creep

24
Q

The recommended maximum temperature for heating a bearing varies the usual temperature range is

A

no more than 250f

25
Q

On a shaft that has four antifriction bearings how many bearings are floating?

A

3

26
Q

When an antifriction bearing is to be fixed on a shaft, the method of holding the bearing is with

A

lock nuts

27
Q

When locating a floating Bearing placement of the bearing is always

A

in the centre

28
Q

To mount a bearing with a tapered bore on standard shaft in you would use

A

adapter sleeve

29
Q

A rule of thumb for seven diametral clearance, when no tables are available is to reduce the initial clearance by roughly

A

50%

30
Q

The best way to remove a bearing with a minimum amount of damage to the Bearing and shaft is with a set of pullers or press all strains must be applied to

A

inner race

31
Q

When applying Greece to an anti-fiction bearing before installation, how much grease is put in the case

A

1/3 to 1/2

31
Q

When tightening a locknut to install a bearing , the slots in the lock nut do not line up with the tabs in the lock washer. What would you do?

A

continue forward to the next tab

31
Q

What is the most common cause of a bearing failure?

A

contamination

32
Q

What basic functions do bearings provide?

A

support moving shafts and slides
reduce friction
confine moving components

33
Q

a bearing is selected for an application on the basis of?

A

equipment requirements

33
Q

What kind of shaft motion is controlled by a journal Bearing

A

radial

34
Q

In addition to supporting the gear shaft and carrying a load, what other functions do bearings perform?

A

maintain shaft alignment

35
Q

Which of the following best describes the hardness of a plane bearing relative to the hardness of the components they guide and support

A

softer

36
Q

A dark coloured bearing indicates

A

over heating

36
Q

Hasty, bearing installation frequently results in

A

early bearing failure

37
Q

Compared to antifriction bearings plane journal bearings have definite advantages, which of the following is not an advantage

A

less axial space required

38
Q

One of the most common causes of plain journal bearing failure is

A

improper lubrication

39
Q

A journal bearings lubricant groove should be located in the area of

A

least pressure (unloaded area)

40
Q

Compared to bearing wall thickness how deep should a lubricant groove be cut?

A

1/3 wall thickness

41
Q

Properly lubricated and aligned plane, journal bearings are especially suited to which of the following applications

A

heavy duty low speed

42
Q

Internal wear in a bearing may be detected by

A

metal particles in oil

43
Q

The principal limitation of antifriction bearings is their lack of resistance to

A

contaminating particles

44
Q

Which of the following roller bearings is designed to carry combined radio and Rust loads

A

tapered roller

45
Q

Size for size which roller bearing has the greatest load carrying capacity

A

needle roller

46
Q

The operating temperature of a bearing should not exceed

A

250 deg f

47
Q

Running clearance in a fraction, Bearing is measured between the

A

shaft od and the bearing bore

48
Q

Where do you check for a diametral clearance on a antifriction Bearing

A

between the outer raceway and the rolling element

49
Q

What is the most common cause of Bearing failure immediately after installation?

A

over lubrication

millwright level 2 (17 decks)

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