USPS 955 Exam Questions with
Complete Solutions7
Which one of the following CANNOT be used as self-lubricating bushings? - ANSWERS-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: - ANSWERS-Contamination of
lubricants with water
Which are the three main factors to consider when choosing a lubricant? - ANSWERS-
Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are: - ANSWERS-Low vibrations, low noise, and
higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped rollers. -
ANSWERS-staggered
When pressing a bearing into the housing, you should press against _________. - ANSWERS-the
outer race only
The purpose of a cylindrical roller bearing is to _________. - ANSWERS-Contain redial motion of
the shaft
The three basic shapes of roller bearings are: - ANSWERS-cylindrical, barrel, and tapered
, The purpose of a thrust bearing is to: - ANSWERS-Contain axial motion of the shaft
_____________ cause overheating in the bearing and reduces the bearing life. - ANSWERS-
insufficient lubrication and speed
In order to remove a bearing from a steel shaft, ___________ can be used without damaging
the bearing or the shaft. - ANSWERS-Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation. - ANSWERS-Axial
Which of the following statements is true? - ANSWERS-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 - ANSWERS-ZN/p
Also called eccentrically loaded bearing is: - ANSWERS-Offset bearing
Reducing noise from sprockets and chain can be done by: - ANSWERS-Choosing sprockets with
more teeth, using a lighter chain, lubricating the bottom of the sprocket tooth
What is the advantage of bushing? - ANSWERS-Self-lubricating, less noise, less vibration
Which of the following lubrication system is used in two stroke engines? - ANSWERS-Mist
system
Thrust ball bearing are used to __________. - ANSWERS-Counteract axial force
Complete Solutions7
Which one of the following CANNOT be used as self-lubricating bushings? - ANSWERS-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: - ANSWERS-Contamination of
lubricants with water
Which are the three main factors to consider when choosing a lubricant? - ANSWERS-
Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are: - ANSWERS-Low vibrations, low noise, and
higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped rollers. -
ANSWERS-staggered
When pressing a bearing into the housing, you should press against _________. - ANSWERS-the
outer race only
The purpose of a cylindrical roller bearing is to _________. - ANSWERS-Contain redial motion of
the shaft
The three basic shapes of roller bearings are: - ANSWERS-cylindrical, barrel, and tapered
, The purpose of a thrust bearing is to: - ANSWERS-Contain axial motion of the shaft
_____________ cause overheating in the bearing and reduces the bearing life. - ANSWERS-
insufficient lubrication and speed
In order to remove a bearing from a steel shaft, ___________ can be used without damaging
the bearing or the shaft. - ANSWERS-Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation. - ANSWERS-Axial
Which of the following statements is true? - ANSWERS-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 - ANSWERS-ZN/p
Also called eccentrically loaded bearing is: - ANSWERS-Offset bearing
Reducing noise from sprockets and chain can be done by: - ANSWERS-Choosing sprockets with
more teeth, using a lighter chain, lubricating the bottom of the sprocket tooth
What is the advantage of bushing? - ANSWERS-Self-lubricating, less noise, less vibration
Which of the following lubrication system is used in two stroke engines? - ANSWERS-Mist
system
Thrust ball bearing are used to __________. - ANSWERS-Counteract axial force
