USPS 955 Exam Questions and
Answers
Reducing noise from sprockets and chain can be done by: - ANSWER-Choosing
sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing? - ANSWER-Self-lubricating, less noise, less
vibration
Which of the following lubrication system is used in two stroke engines? - ANSWER-
Mist system
Thrust ball bearing are used to __________. - ANSWER-Counteract axial force
Which one of the following CANNOT be used as self-lubricating bushings? -
ANSWER-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: -
ANSWER-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. -
ANSWER-different
For a journal bearing design, the clearance ratio ("clearance") should be
approximately considered as: - ANSWER-0.0010
Select a bearing to sustain axial as well as radial loads: - ANSWER-Tapered roller
bearing
Which of the following can provide bi-directional thrust load? - ANSWER-Thrust ball
bearings
Hydrostatic bearing usually use __________ as lubricant. - ANSWER-Oil
Oil whirl in journal bearing can be prevented by ________ - ANSWER-Providing an
obstacle to the whirling fluid or providing the stabilized loading are used to avoid
whirls
Which of the following wear type occurs the least in a bearing when used in a
turbine? - ANSWER-Corrosion
, V-belts are superior to flat belts because ________. - ANSWER-The belt does not
slip away and slip off from the pulley
A v-belt drive has just had its belts replaced. What must be checked/done as a first
precaution before running the drive? - ANSWER-The belts are placed over the
sheaves and in the grooves without forcing
Which one is NOT true for under tension belts: - ANSWER-Reduce bearing and belt
life
Which of the following is NOT a procedure for surface and edge wear inspection of a
belt? - ANSWER-Confirm that belt can be moved laterally of the drive/idle shaft
Considering the power transmission through V-belt, which one is not correct?
V-belts are
used at the high-speed end.
used at the low-speed end.
of standard lengths.
of standardized angles. - ANSWER-2
The cause of creep in belts is due to: - ANSWER-Unequal tension in tight and slack
side of the belt
The inner diameter (ID) and the outer diameter (OD) of a clutch plate pair are 100
mm and 200 mm respectively. The operating force of the clutch is 23.6 kN. Calculate
the permissible intensity of pressure (N/mm2). - ANSWER-1.5
In a two-sprocket chain mechanism, to achieve 150 rpm at the smaller sprocket
when the bigger sprocket (50 teeth) rotates at 50 rpm, what should be the number of
teeth of the smaller sprocket? - ANSWER-16
The X gear has 5 teeth and is connected to the motor. The Y gear has 20 teeth and
is an intermediate idler gear. The Z gear has 30 teeth and is connected to the roller.
If the roller's required speed is 50 rpm, what should be the motor's rotating speed? -
ANSWER-300
Gear A has 30 teeth and rotates at 30 rpm. Gear B has 15 teeth. How many rpm will
gear B rotate when driven by the same driving gear? - ANSWER-60
The distance between two sprocket teeth is called _______. - ANSWER-Pitch
What is the output speed of the gearbox shaft if the input speed is 200 revolutions
per second?
The gear ratio is 10. - ANSWER-33.33 rpm
Before the piston is removed, we must remove the: - ANSWER-Piston ring
Answers
Reducing noise from sprockets and chain can be done by: - ANSWER-Choosing
sprockets with more teeth, using a lighter chain, lubricating the bottom of the
sprocket tooth
What is the advantage of bushing? - ANSWER-Self-lubricating, less noise, less
vibration
Which of the following lubrication system is used in two stroke engines? - ANSWER-
Mist system
Thrust ball bearing are used to __________. - ANSWER-Counteract axial force
Which one of the following CANNOT be used as self-lubricating bushings? -
ANSWER-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: -
ANSWER-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. -
ANSWER-different
For a journal bearing design, the clearance ratio ("clearance") should be
approximately considered as: - ANSWER-0.0010
Select a bearing to sustain axial as well as radial loads: - ANSWER-Tapered roller
bearing
Which of the following can provide bi-directional thrust load? - ANSWER-Thrust ball
bearings
Hydrostatic bearing usually use __________ as lubricant. - ANSWER-Oil
Oil whirl in journal bearing can be prevented by ________ - ANSWER-Providing an
obstacle to the whirling fluid or providing the stabilized loading are used to avoid
whirls
Which of the following wear type occurs the least in a bearing when used in a
turbine? - ANSWER-Corrosion
, V-belts are superior to flat belts because ________. - ANSWER-The belt does not
slip away and slip off from the pulley
A v-belt drive has just had its belts replaced. What must be checked/done as a first
precaution before running the drive? - ANSWER-The belts are placed over the
sheaves and in the grooves without forcing
Which one is NOT true for under tension belts: - ANSWER-Reduce bearing and belt
life
Which of the following is NOT a procedure for surface and edge wear inspection of a
belt? - ANSWER-Confirm that belt can be moved laterally of the drive/idle shaft
Considering the power transmission through V-belt, which one is not correct?
V-belts are
used at the high-speed end.
used at the low-speed end.
of standard lengths.
of standardized angles. - ANSWER-2
The cause of creep in belts is due to: - ANSWER-Unequal tension in tight and slack
side of the belt
The inner diameter (ID) and the outer diameter (OD) of a clutch plate pair are 100
mm and 200 mm respectively. The operating force of the clutch is 23.6 kN. Calculate
the permissible intensity of pressure (N/mm2). - ANSWER-1.5
In a two-sprocket chain mechanism, to achieve 150 rpm at the smaller sprocket
when the bigger sprocket (50 teeth) rotates at 50 rpm, what should be the number of
teeth of the smaller sprocket? - ANSWER-16
The X gear has 5 teeth and is connected to the motor. The Y gear has 20 teeth and
is an intermediate idler gear. The Z gear has 30 teeth and is connected to the roller.
If the roller's required speed is 50 rpm, what should be the motor's rotating speed? -
ANSWER-300
Gear A has 30 teeth and rotates at 30 rpm. Gear B has 15 teeth. How many rpm will
gear B rotate when driven by the same driving gear? - ANSWER-60
The distance between two sprocket teeth is called _______. - ANSWER-Pitch
What is the output speed of the gearbox shaft if the input speed is 200 revolutions
per second?
The gear ratio is 10. - ANSWER-33.33 rpm
Before the piston is removed, we must remove the: - ANSWER-Piston ring
