Millwright - 2nd Year - Plain Bearings Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
How do plain bearings differ from Plain bearings have no rolling elements
anti-friction bearings?
What are the 2 types of plain 1. Journal Bearings
bearings? 2. Thrust Bearings
What type of load does a journal Radial
bearing support?
What type of load does a thrust Axial
bearing support?
What is the "Journal"? The part of the shaft in contact wiht the
bearing
usually machined to closer tolerances than
the rest
of the shaft.
What are the 2 main functions of a 1. Hold a joural in its required location
journal bearing? 2. Support the intended radial load
What are the 3 most common 1. Stationary load
radial 2. Oscillating load
loads? 3. Reciprocating load
,In a stationary load, how many One direction. The load-supporting
directions does the load generally lubricant films
act on? stays in one area of the bearing.
With oscillating loads, the load less than 180 degrees.
shifts
through an arc
_________________.
What does the load-supporting film It shifts around the loaded area as it
do in an oscillating load? oscillates.
How does the load-supporting film The fluid film is much thinner, but stronger
in an oscillating load compare to a
stationary load?
Why is surface finish of bearings Becasue the lubricant film is so thin.
and
journals and cleanliness of the oil
are
more critical than on journals with
steady rotation?
How does the load shift in a It shift 180 degrees from one side of the
reciprocating load? bearing to
the other.
What are the 2 types of Journal 1. Split Bearing
bearings? 2. Bushing
, What is the most common material Babbit
for overlay on a thin shell split
bearing?
What does the shell of a thin shell A thin overlay (usually babbit) on a steel
split bearing consist of? backing.
Some intermediate layers of material (like
copper)
may be used to bond the overlay to the
backing.
What are the main applications of They were developed for automotive
a engines and
thin shell split bearing? are now used in large industrial machines
What are the advantages of a thin 1. High load capacity
shell split bearings? 2. Allow more compact housing
3. Relatively inexpensive to replace
4. Quick to change out
5. Available in oversizes and undersizes,
which
allows grinding of the journal for reuse
6. They have consistent quality for
dimensions and
strength of bonding to the backing
7. A wide range of materials can be used
in there
construction
What applications are thick-walled Gearboxes, trubines, fans and dynamic
split bearings usually found in? compressors
Questions and Answers with Verified
Solutions | Latest Updated 2026
How do plain bearings differ from Plain bearings have no rolling elements
anti-friction bearings?
What are the 2 types of plain 1. Journal Bearings
bearings? 2. Thrust Bearings
What type of load does a journal Radial
bearing support?
What type of load does a thrust Axial
bearing support?
What is the "Journal"? The part of the shaft in contact wiht the
bearing
usually machined to closer tolerances than
the rest
of the shaft.
What are the 2 main functions of a 1. Hold a joural in its required location
journal bearing? 2. Support the intended radial load
What are the 3 most common 1. Stationary load
radial 2. Oscillating load
loads? 3. Reciprocating load
,In a stationary load, how many One direction. The load-supporting
directions does the load generally lubricant films
act on? stays in one area of the bearing.
With oscillating loads, the load less than 180 degrees.
shifts
through an arc
_________________.
What does the load-supporting film It shifts around the loaded area as it
do in an oscillating load? oscillates.
How does the load-supporting film The fluid film is much thinner, but stronger
in an oscillating load compare to a
stationary load?
Why is surface finish of bearings Becasue the lubricant film is so thin.
and
journals and cleanliness of the oil
are
more critical than on journals with
steady rotation?
How does the load shift in a It shift 180 degrees from one side of the
reciprocating load? bearing to
the other.
What are the 2 types of Journal 1. Split Bearing
bearings? 2. Bushing
, What is the most common material Babbit
for overlay on a thin shell split
bearing?
What does the shell of a thin shell A thin overlay (usually babbit) on a steel
split bearing consist of? backing.
Some intermediate layers of material (like
copper)
may be used to bond the overlay to the
backing.
What are the main applications of They were developed for automotive
a engines and
thin shell split bearing? are now used in large industrial machines
What are the advantages of a thin 1. High load capacity
shell split bearings? 2. Allow more compact housing
3. Relatively inexpensive to replace
4. Quick to change out
5. Available in oversizes and undersizes,
which
allows grinding of the journal for reuse
6. They have consistent quality for
dimensions and
strength of bonding to the backing
7. A wide range of materials can be used
in there
construction
What applications are thick-walled Gearboxes, trubines, fans and dynamic
split bearings usually found in? compressors
