USPS 955 Practice Questions with 100%
Correct Answers
Which one of the following CANNOT be used as self-lubricating bushings?
Sleeved bushings consist of metal, plastic, or reinforced fibers composites sleeves that reduce
noise and vibrations by reducing the friction between moving mechanical parts.
Oil (lubricants) foaming in gear mechanism is caused by:
Contamination of lubricants with water
Which are the three main factors to consider when choosing a lubricant?
Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are:
Low vibrations, low noise, and higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped
rollers.
staggered
When pressing a bearing into the housing, you should press against _________.
the outer race only
The purpose of a cylindrical roller bearing is to _________.
Contain redial motion of the shaft
The three basic shapes of roller bearings are:
cylindrical, barrel, and tapered
, The purpose of a thrust bearing is to:
Contain axial motion of the shaft
_____________ cause overheating in the bearing and reduces the bearing life.
insufficient lubrication and speed
In order to remove a bearing from a steel shaft, ___________ can be used without
damaging the bearing or the shaft.
Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation.
Axial
Which of the following statements is true?
Zero-film are sliding bearing which are lubrication-free
The characteristic number of the bearing is given by:
Z=absolute viscosity of the lubricant, N= speed of journal, p=bearing pressure
ZN/p
Also called eccentrically loaded bearing is:
Offset bearing
Reducing noise from sprockets and chain can be done by:
Choosing sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing?
Correct Answers
Which one of the following CANNOT be used as self-lubricating bushings?
Sleeved bushings consist of metal, plastic, or reinforced fibers composites sleeves that reduce
noise and vibrations by reducing the friction between moving mechanical parts.
Oil (lubricants) foaming in gear mechanism is caused by:
Contamination of lubricants with water
Which are the three main factors to consider when choosing a lubricant?
Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are:
Low vibrations, low noise, and higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped
rollers.
staggered
When pressing a bearing into the housing, you should press against _________.
the outer race only
The purpose of a cylindrical roller bearing is to _________.
Contain redial motion of the shaft
The three basic shapes of roller bearings are:
cylindrical, barrel, and tapered
, The purpose of a thrust bearing is to:
Contain axial motion of the shaft
_____________ cause overheating in the bearing and reduces the bearing life.
insufficient lubrication and speed
In order to remove a bearing from a steel shaft, ___________ can be used without
damaging the bearing or the shaft.
Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation.
Axial
Which of the following statements is true?
Zero-film are sliding bearing which are lubrication-free
The characteristic number of the bearing is given by:
Z=absolute viscosity of the lubricant, N= speed of journal, p=bearing pressure
ZN/p
Also called eccentrically loaded bearing is:
Offset bearing
Reducing noise from sprockets and chain can be done by:
Choosing sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing?
