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Millwright Level 2 - Bearings FINAL Exam 2026-2027 BANK
QUESTIONS WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% Latest Already
Graded A+
QUESTION 1
Which type of bearing is designed to support loads perpendicular to the
shaft axis?
A) Thrust bearing
B) Radial bearing
C) Angular contact bearing
D) Tapered roller bearing
Answer: B) Radial bearing
Explanation: Radial bearings are specifically engineered to support
loads that act at right angles to the shaft axis. Thrust bearings handle
axial loads, while angular contact and tapered roller bearings can
accommodate both radial and thrust loads in combination.
QUESTION 2
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The coefficient of friction in a properly lubricated hydrodynamic journal
bearing typically falls within which range?
A) 0.001 to 0.010
B) 0.010 to 0.050
C) 0.050 to 0.100
D) 0.100 to 0.500
Answer: A) 0.001 to 0.010
Explanation: Hydrodynamic bearings operating with a full fluid film
achieve coefficients of friction between 0.001 and 0.010. This extremely
low friction results from complete separation of the shaft and bearing
surfaces by an oil film, eliminating metal-to-metal contact.
QUESTION 3
What is the primary purpose of bearing preload?
A) To increase bearing speed capacity
B) To eliminate internal clearance and increase rigidity
C) To reduce lubrication requirements
D) To make installation easier
Answer: B) To eliminate internal clearance and increase rigidity
Explanation: Bearing preload applies an initial load to remove all
internal clearance within the bearing assembly. This increases the
bearing's rigidity, reduces deflection under load, improves load
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distribution among rolling elements, and minimizes vibration and noise
in high-precision applications.
QUESTION 4
Which bearing material is most commonly used for high-temperature
applications exceeding 300 degrees Fahrenheit?
A) Babbitt
B) Bronze
C) Aluminum alloy
D) Silver-plated steel
Answer: C) Aluminum alloy
Explanation: Aluminum alloy bearings maintain their mechanical
properties and dimensional stability at temperatures above 300 degrees
Fahrenheit, unlike Babbitt which softens. Bronze can be used but
aluminum alloys offer superior high-temperature performance and
corrosion resistance in many industrial applications.
QUESTION 5
The angle of contact in a deep groove ball bearing is:
A) 0 degrees
B) 15 degrees
C) 30 degrees
D) 45 degrees
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Answer: A) 0 degrees
Explanation: Deep groove ball bearings have a nominal contact angle of
0 degrees, meaning the load is transmitted radially through the balls
perpendicular to the shaft axis. While they can accommodate some
axial load, their primary design is for radial loading with minimal
internal clearance.
QUESTION 6
What does the term "L10 life" represent in bearing specification?
A) The average life of all bearings in a population
B) The life at which 10 percent of bearings fail
C) The maximum possible bearing life
D) The life at which 90 percent of bearings survive
Answer: D) The life at which 90 percent of bearings survive
Explanation: L10 life, also called rated life or B10 life, is the number of
revolutions or operating hours that 90 percent of a group of identical
bearings will survive before the first signs of fatigue failure appear. It
represents a statistical measure used for bearing selection and
reliability calculations.
QUESTION 7
Which lubrication method delivers oil directly to the bearing through
pressurized lines?
Millwright Level 2 - Bearings FINAL Exam 2026-2027 BANK
QUESTIONS WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% Latest Already
Graded A+
QUESTION 1
Which type of bearing is designed to support loads perpendicular to the
shaft axis?
A) Thrust bearing
B) Radial bearing
C) Angular contact bearing
D) Tapered roller bearing
Answer: B) Radial bearing
Explanation: Radial bearings are specifically engineered to support
loads that act at right angles to the shaft axis. Thrust bearings handle
axial loads, while angular contact and tapered roller bearings can
accommodate both radial and thrust loads in combination.
QUESTION 2
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The coefficient of friction in a properly lubricated hydrodynamic journal
bearing typically falls within which range?
A) 0.001 to 0.010
B) 0.010 to 0.050
C) 0.050 to 0.100
D) 0.100 to 0.500
Answer: A) 0.001 to 0.010
Explanation: Hydrodynamic bearings operating with a full fluid film
achieve coefficients of friction between 0.001 and 0.010. This extremely
low friction results from complete separation of the shaft and bearing
surfaces by an oil film, eliminating metal-to-metal contact.
QUESTION 3
What is the primary purpose of bearing preload?
A) To increase bearing speed capacity
B) To eliminate internal clearance and increase rigidity
C) To reduce lubrication requirements
D) To make installation easier
Answer: B) To eliminate internal clearance and increase rigidity
Explanation: Bearing preload applies an initial load to remove all
internal clearance within the bearing assembly. This increases the
bearing's rigidity, reduces deflection under load, improves load
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distribution among rolling elements, and minimizes vibration and noise
in high-precision applications.
QUESTION 4
Which bearing material is most commonly used for high-temperature
applications exceeding 300 degrees Fahrenheit?
A) Babbitt
B) Bronze
C) Aluminum alloy
D) Silver-plated steel
Answer: C) Aluminum alloy
Explanation: Aluminum alloy bearings maintain their mechanical
properties and dimensional stability at temperatures above 300 degrees
Fahrenheit, unlike Babbitt which softens. Bronze can be used but
aluminum alloys offer superior high-temperature performance and
corrosion resistance in many industrial applications.
QUESTION 5
The angle of contact in a deep groove ball bearing is:
A) 0 degrees
B) 15 degrees
C) 30 degrees
D) 45 degrees
, 4|Page
Answer: A) 0 degrees
Explanation: Deep groove ball bearings have a nominal contact angle of
0 degrees, meaning the load is transmitted radially through the balls
perpendicular to the shaft axis. While they can accommodate some
axial load, their primary design is for radial loading with minimal
internal clearance.
QUESTION 6
What does the term "L10 life" represent in bearing specification?
A) The average life of all bearings in a population
B) The life at which 10 percent of bearings fail
C) The maximum possible bearing life
D) The life at which 90 percent of bearings survive
Answer: D) The life at which 90 percent of bearings survive
Explanation: L10 life, also called rated life or B10 life, is the number of
revolutions or operating hours that 90 percent of a group of identical
bearings will survive before the first signs of fatigue failure appear. It
represents a statistical measure used for bearing selection and
reliability calculations.
QUESTION 7
Which lubrication method delivers oil directly to the bearing through
pressurized lines?
