USPS 955 Exam Questions And
Answers Verified 100% Correct!!
Which one of the following CANNOT be used as self-lubricating bushings? CORRECT
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: CORRECT ANSWERS
Contamination of lubricants with water
Which are the three main factors to consider when choosing a lubricant? CORRECT
ANSWERS Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are: CORRECT ANSWERS Low vibrations,
low noise, and higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped
rollers. CORRECT ANSWERS staggered
When pressing a bearing into the housing, you should press against _________.
CORRECT ANSWERS the outer race only
The purpose of a cylindrical roller bearing is to _________. CORRECT ANSWERS
Contain redial motion of the shaft
The three basic shapes of roller bearings are: CORRECT ANSWERS cylindrical, barrel,
and tapered
The purpose of a thrust bearing is to: CORRECT ANSWERS Contain axial motion of
the shaft
_____________ cause overheating in the bearing and reduces the bearing life.
CORRECT 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. CORRECT ANSWERS Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation. CORRECT
ANSWERS Axial
Which of the following statements is true? CORRECT 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
CORRECT ANSWERS ZN/p
Also called eccentrically loaded bearing is: CORRECT ANSWERS Offset bearing
Reducing noise from sprockets and chain can be done by: CORRECT ANSWERS
Choosing sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing? CORRECT ANSWERS Self-lubricating, less noise,
less vibration
Which of the following lubrication system is used in two stroke engines? CORRECT
ANSWERS Mist system
Thrust ball bearing are used to __________. CORRECT ANSWERS Counteract axial
force
Which one of the following CANNOT be used as self-lubricating bushings? CORRECT
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.
The throwout bearing and the spring diaphragm in a clutch are connected: CORRECT
ANSWERS When the clutch pedal is pressed
Bearing failure in motors can be caused due to wrong selection of bearings. A motor
mounted horizontally or vertically needs _____________ types of bearings. CORRECT
ANSWERS different
For a journal bearing design, the clearance ratio ("clearance") should be approximately
considered as: CORRECT ANSWERS 0.0010
Select a bearing to sustain axial as well as radial loads: CORRECT ANSWERS
Tapered roller bearing
Which of the following can provide bi-directional thrust load? CORRECT ANSWERS
Thrust ball bearings
Hydrostatic bearing usually use __________ as lubricant. CORRECT ANSWERS Oil
Oil whirl in journal bearing can be prevented by ________ CORRECT ANSWERS
Providing an obstacle to the whirling fluid or providing the stabilized loading are used to
avoid whirls
Answers Verified 100% Correct!!
Which one of the following CANNOT be used as self-lubricating bushings? CORRECT
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: CORRECT ANSWERS
Contamination of lubricants with water
Which are the three main factors to consider when choosing a lubricant? CORRECT
ANSWERS Temperature, workload, speed of moving parts
The benefit/benefits of dynamic balancing are: CORRECT ANSWERS Low vibrations,
low noise, and higher bearing life
____________ roller bearings are available in cylindrical, barrel and taper shaped
rollers. CORRECT ANSWERS staggered
When pressing a bearing into the housing, you should press against _________.
CORRECT ANSWERS the outer race only
The purpose of a cylindrical roller bearing is to _________. CORRECT ANSWERS
Contain redial motion of the shaft
The three basic shapes of roller bearings are: CORRECT ANSWERS cylindrical, barrel,
and tapered
The purpose of a thrust bearing is to: CORRECT ANSWERS Contain axial motion of
the shaft
_____________ cause overheating in the bearing and reduces the bearing life.
CORRECT 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. CORRECT ANSWERS Dry ice and liquid nitrogen
____________ load is acting on the plane of the bearings' axis of rotation. CORRECT
ANSWERS Axial
Which of the following statements is true? CORRECT 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
CORRECT ANSWERS ZN/p
Also called eccentrically loaded bearing is: CORRECT ANSWERS Offset bearing
Reducing noise from sprockets and chain can be done by: CORRECT ANSWERS
Choosing sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing? CORRECT ANSWERS Self-lubricating, less noise,
less vibration
Which of the following lubrication system is used in two stroke engines? CORRECT
ANSWERS Mist system
Thrust ball bearing are used to __________. CORRECT ANSWERS Counteract axial
force
Which one of the following CANNOT be used as self-lubricating bushings? CORRECT
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.
The throwout bearing and the spring diaphragm in a clutch are connected: CORRECT
ANSWERS When the clutch pedal is pressed
Bearing failure in motors can be caused due to wrong selection of bearings. A motor
mounted horizontally or vertically needs _____________ types of bearings. CORRECT
ANSWERS different
For a journal bearing design, the clearance ratio ("clearance") should be approximately
considered as: CORRECT ANSWERS 0.0010
Select a bearing to sustain axial as well as radial loads: CORRECT ANSWERS
Tapered roller bearing
Which of the following can provide bi-directional thrust load? CORRECT ANSWERS
Thrust ball bearings
Hydrostatic bearing usually use __________ as lubricant. CORRECT ANSWERS Oil
Oil whirl in journal bearing can be prevented by ________ CORRECT ANSWERS
Providing an obstacle to the whirling fluid or providing the stabilized loading are used to
avoid whirls
