Millwright - 2nd Year - Bearing Maintenance:
Part A Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
What are symptoms of bearing 1. Temperature
failure? 2. Vibration
3. High Amperage Readings
4. Dirty Oil
5. Noise
What factors affect bearing 1. Friction
temperature? 2. Rate of heat dissapation
3. Heat transfer from outside sources
What affect on lubrication do high Results in rapid oxidization and inadequate
temperatures have (above 55 lubrication
degrees Celcius)?
What is the estimated temperature Housing is at least 60 degrees Celcius and
of the
a housing and bearing if you bearing is at least 80 degrees Celcius
cannot
hold your hand on it for more than
1
second?
,On a bearing that has been the rollers and raceways are deterioration
running and
satisfactorily, what can the generating more friction
assumed
cause of a temperature increase
be?
After a bearing has been installed 15 degrees celcius
and relubricated, to what will the
temperature rise for a few hours
before it returning to its normal
operating temperature?
What does a rise in temperature, Faulty installation or wrong type of bearing
more than the standard 15
degrees
Celcius for a few hours, after a
bearing has been installed or
relubricated indicate?
Unsealed bearing temperature is 125 degrees Celcius (257 degrees F)
too
high when it exceeds
______________ for
all bearings.
Sealed bearing temperature is too 80 degrees Celcius (176 degrees F)
high when it exceeds
___________________.
, What figures are added to the For rolling elements, add 20 degrees
bearing housing temperature to Celcius to the
estimate the rolling elements and housing temperature. For inner ring
inner ring temperature? temperature,
add 10 degrees Celcius to the rolling
element
temperature (30 degrees to the houssing
temperature).
What is vibration? Movement due to unbalanced forces
moving a
rotor back and forth.
How can a bearing create its own Rolling elements rolling over the
vibration? roughened
surface of the raceway
What causes high amperage Abnormal lopads on a machine
readings on a machine?
How are high amperage readings By reading the ammeter on the machine
checked? panel or
by checking at the electric motor junction
box
How do you check used oil for With a magnet
metal
particles?
Part A Exam Questions and Answers with
Verified Solutions | Latest Updated 2026
What are symptoms of bearing 1. Temperature
failure? 2. Vibration
3. High Amperage Readings
4. Dirty Oil
5. Noise
What factors affect bearing 1. Friction
temperature? 2. Rate of heat dissapation
3. Heat transfer from outside sources
What affect on lubrication do high Results in rapid oxidization and inadequate
temperatures have (above 55 lubrication
degrees Celcius)?
What is the estimated temperature Housing is at least 60 degrees Celcius and
of the
a housing and bearing if you bearing is at least 80 degrees Celcius
cannot
hold your hand on it for more than
1
second?
,On a bearing that has been the rollers and raceways are deterioration
running and
satisfactorily, what can the generating more friction
assumed
cause of a temperature increase
be?
After a bearing has been installed 15 degrees celcius
and relubricated, to what will the
temperature rise for a few hours
before it returning to its normal
operating temperature?
What does a rise in temperature, Faulty installation or wrong type of bearing
more than the standard 15
degrees
Celcius for a few hours, after a
bearing has been installed or
relubricated indicate?
Unsealed bearing temperature is 125 degrees Celcius (257 degrees F)
too
high when it exceeds
______________ for
all bearings.
Sealed bearing temperature is too 80 degrees Celcius (176 degrees F)
high when it exceeds
___________________.
, What figures are added to the For rolling elements, add 20 degrees
bearing housing temperature to Celcius to the
estimate the rolling elements and housing temperature. For inner ring
inner ring temperature? temperature,
add 10 degrees Celcius to the rolling
element
temperature (30 degrees to the houssing
temperature).
What is vibration? Movement due to unbalanced forces
moving a
rotor back and forth.
How can a bearing create its own Rolling elements rolling over the
vibration? roughened
surface of the raceway
What causes high amperage Abnormal lopads on a machine
readings on a machine?
How are high amperage readings By reading the ammeter on the machine
checked? panel or
by checking at the electric motor junction
box
How do you check used oil for With a magnet
metal
particles?
