Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What are the two basic methods of sealing fluids in a closed
system? -
correct answer ✅Mechanical seals and compression packing.
What is the main difference between compression packing and
mechanical seals? -
correct answer ✅Packing must leak to lubricate and/or seal shafts,
while mechanical seals are designed not to leak or to minimize
leakage.
What is the primary use of mechanical seals? -
correct answer ✅Rotating shafts of pumps or compressors.
What is the equivalent of a leakage rate of 60 drops per minute? -
correct answer ✅3600 drops per hour, 1.5 gallons per day, and
550.0 gallons per year.
What is the leakage rate of mechanical seals? -
correct answer ✅Approximately 5 drops per hour, 120 drops per
day, and 0.8 gallons per year.
,Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What are some costs associated with compression packing? -
correct answer ✅Shaft/sleeve replacement, maintenance costs,
downtime, housekeeping, environmental considerations, and
energy consumption.
How can using mechanical seals reduce costs? -
correct answer ✅By reducing the costs associated with
compression packing.
What are some potential drawbacks of using mechanical seals? -
correct answer ✅Higher level of training, higher initial installation
costs, and potential need for special/unique designs.
What is the purpose of the caution mentioned in the notes? -
correct answer ✅To alert the reader to potential hazards or risks
associated with the topic being discussed.
Why are mechanical seals prohibited in pumps used for fire safety?
-
correct answer ✅Mechanical seals fail completely when they fail
to seal.
,Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What is the focus of this module? -
correct answer ✅Application of mechanical seals for pumps.
What is the objective of the module? -
correct answer ✅To describe the working principles and
components of mechanical seals.
How are mechanical seals classified? -
correct answer ✅By design or arrangement.
What are the four basic types of components in mechanical seals? -
correct answer ✅Primary sealing faces, mechanism for holding the
faces together, secondary seals, and metal components.
What are the five seal points in mechanical seals? -
correct answer ✅Primary sealing point and four secondary sealing
points.
, Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What are the different types of secondary seals? -
correct answer ✅Square/gasket packing, V-packing, U-cups, PTFE
wedges, Delta rings, and O-rings.
What is secondary sealing? -
correct answer ✅Sealing at rotating element
What is the point of contact between gland and pump? -
correct answer ✅Another sealing point
What is used to seal the point between shaft and sleeve? -
correct answer ✅Dynamic seal
What is primary sealing? -
correct answer ✅Sealing at primary faces
What is the mechanism that pushes the two faces together? -
correct answer ✅Axial force from closing mechanism
Seals Exam Questions and Answers
100% score Latest update 2026
What are the two basic methods of sealing fluids in a closed
system? -
correct answer ✅Mechanical seals and compression packing.
What is the main difference between compression packing and
mechanical seals? -
correct answer ✅Packing must leak to lubricate and/or seal shafts,
while mechanical seals are designed not to leak or to minimize
leakage.
What is the primary use of mechanical seals? -
correct answer ✅Rotating shafts of pumps or compressors.
What is the equivalent of a leakage rate of 60 drops per minute? -
correct answer ✅3600 drops per hour, 1.5 gallons per day, and
550.0 gallons per year.
What is the leakage rate of mechanical seals? -
correct answer ✅Approximately 5 drops per hour, 120 drops per
day, and 0.8 gallons per year.
,Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What are some costs associated with compression packing? -
correct answer ✅Shaft/sleeve replacement, maintenance costs,
downtime, housekeeping, environmental considerations, and
energy consumption.
How can using mechanical seals reduce costs? -
correct answer ✅By reducing the costs associated with
compression packing.
What are some potential drawbacks of using mechanical seals? -
correct answer ✅Higher level of training, higher initial installation
costs, and potential need for special/unique designs.
What is the purpose of the caution mentioned in the notes? -
correct answer ✅To alert the reader to potential hazards or risks
associated with the topic being discussed.
Why are mechanical seals prohibited in pumps used for fire safety?
-
correct answer ✅Mechanical seals fail completely when they fail
to seal.
,Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What is the focus of this module? -
correct answer ✅Application of mechanical seals for pumps.
What is the objective of the module? -
correct answer ✅To describe the working principles and
components of mechanical seals.
How are mechanical seals classified? -
correct answer ✅By design or arrangement.
What are the four basic types of components in mechanical seals? -
correct answer ✅Primary sealing faces, mechanism for holding the
faces together, secondary seals, and metal components.
What are the five seal points in mechanical seals? -
correct answer ✅Primary sealing point and four secondary sealing
points.
, Millwright - 2nd Year: Mechanical
Seals Exam Questions and Answers
100% score Latest update 2026
What are the different types of secondary seals? -
correct answer ✅Square/gasket packing, V-packing, U-cups, PTFE
wedges, Delta rings, and O-rings.
What is secondary sealing? -
correct answer ✅Sealing at rotating element
What is the point of contact between gland and pump? -
correct answer ✅Another sealing point
What is used to seal the point between shaft and sleeve? -
correct answer ✅Dynamic seal
What is primary sealing? -
correct answer ✅Sealing at primary faces
What is the mechanism that pushes the two faces together? -
correct answer ✅Axial force from closing mechanism
