bearings test teacher questions Flashcards
This type of bearing is used for drives where the load is applied, parallel to or slightly above the horizontal
angle bearing
Name two basic types of bearings used
Friction and anti-friction bearings
Friction bearings are also referred to as?
plain bearings sleeve bearings and journal bearings
Anti-friction bearings have a rolling contact between the shaft and bearing using?
Balls, needles or rollers
bearing housings are made from what materials ?
cast iron - general use light-medium loads
cast steel- general use light-heavy loads
fabricated steel- special jobs
This type of bearing is used for drives were the load is applied parallel to or slightly above horizontal
angle bearing
This bearing combines the rigidity of a solid block with the advantage of split construction and a suitable for sideloading
gib joint bearing
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?
babbit
What type of Berean uses a shaft itself as a bearing in a ring
needle bearings
What type of antifriction bearing is generally suited to high-speed applications
ball bearing
Bearings may have either a straight or tapered for standard taper, has a ratio of?
1:12
k 30 means 1:30 ( very large bearings)
Variance having a tapered board, will have their code number with what letter
K indicates a tapered bore
What type of bearing would be used by the lubricant in a bearing is to be kept in the Bearing
sealed bearing
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?
installed clearance
The term Babbitt includes several all the ways that contain various propositions of
tin
copper
lead
Depending on the Alloy , when pouring a bearing, the temperature of Babbitt should be between
650 f-700f
In a Babbitt, bearing what prevents the bad it from, turning, and holds it firmly against the casting?
keys
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?
mandrel
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
blow back
In the Babbitt, bearing the corners of the bottom, half of the Bearing must be?
relieved
What material is used with checking a Babbitt bearing for contact
Prussian blue
When cutting oil or grease grooves in a babbit bearing, where should they be located?
bearing cap (unloaded section)
To firmly attach a thin skin of babbit material to a metallic backing you must perform this operation
tinning
When Bearing shells are first install, they frequently extend past the face of the bearing buy a small amount, which is known as
crush
Rust control, and friction variance is obtained by bearing design or
shaft collar
What force does the Kingsbury thrust bearing depend on for complete lubrication?
centrifugal force
This occurrence in and antifriction bearing changes the contact area on the raceway and extends the service life of the Bearing
creep
The recommended maximum temperature for heating a bearing varies the usual temperature range is
no more than 250f
On a shaft that has four antifriction bearings how many bearings are floating?
3
When an antifriction bearing is to be fixed on a shaft, the method of holding the bearing is with
lock nuts
When locating a floating Bearing placement of the bearing is always
in the centre
To mount a bearing with a tapered bore on standard shaft in you would use
adapter sleeve
A rule of thumb for seven diametral clearance, when no tables are available is to reduce the initial clearance by roughly
50%
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
inner race
When applying Greece to an anti-fiction bearing before installation, how much grease is put in the case
1/3 to 1/2
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?
continue forward to the next tab
What is the most common cause of a bearing failure?
contamination
What basic functions do bearings provide?
support moving shafts and slides
reduce friction
confine moving components
a bearing is selected for an application on the basis of?
equipment requirements
What kind of shaft motion is controlled by a journal Bearing
radial
In addition to supporting the gear shaft and carrying a load, what other functions do bearings perform?
maintain shaft alignment
Which of the following best describes the hardness of a plane bearing relative to the hardness of the components they guide and support
softer
A dark coloured bearing indicates
over heating
Hasty, bearing installation frequently results in
early bearing failure
Compared to antifriction bearings plane journal bearings have definite advantages, which of the following is not an advantage
less axial space required
One of the most common causes of plain journal bearing failure is
improper lubrication
A journal bearings lubricant groove should be located in the area of
least pressure (unloaded area)
Compared to bearing wall thickness how deep should a lubricant groove be cut?
1/3 wall thickness
Properly lubricated and aligned plane, journal bearings are especially suited to which of the following applications
heavy duty low speed
Internal wear in a bearing may be detected by
metal particles in oil
The principal limitation of antifriction bearings is their lack of resistance to
contaminating particles
Which of the following roller bearings is designed to carry combined radio and Rust loads
tapered roller
Size for size which roller bearing has the greatest load carrying capacity
needle roller
The operating temperature of a bearing should not exceed
250 deg f
Running clearance in a fraction, Bearing is measured between the
shaft od and the bearing bore
Where do you check for a diametral clearance on a antifriction Bearing
between the outer raceway and the rolling element
What is the most common cause of Bearing failure immediately after installation?
over lubrication
