Question 1

Which of the following seals should never be run when it is dry?&#10;A) mechanical seal&#10;C) packing seal&#10;B) O-ring&#10;D) radial lip seal

Accepted Answer

Mechanical seals are designed to operate with a small amount of lubrication fluid, and running them dry can cause them to quickly overheat and fail, leading to costly repairs. The other seals listed (O-ring, packing seal, radial lip seal) can typically handle running dry for short periods without significant damage.

Question 2

Which of the following is not a part of a stuffing box seal?&#10;A) the packing chamber&#10;C) the packing rings&#10;B) the packing slot&#10;D) the stuffing glands

Accepted Answer

The packing slot is not a part of a stuffing box seal. A stuffing box typically includes a packing chamber, packing rings, and stuffing glands to seal around a rotating or reciprocating shaft to prevent leakage.

Question 3

The three types of seals are the packing seal, the radial lip seal, and the ____ seal.&#10;A) O-ring&#10;C) compression&#10;B) mechanical&#10;D) lantern ring

Accepted Answer

The packing seal and the radial lip seal are both types of mechanical seals, so the missing option would also need to be a mechanical seal. The O-ring and the lantern ring are both specific types of mechanical seals, while the compression seal is not commonly used in this context. Therefore, B - mechanical - is the best choice.

Question 4

When placing the packing rings in the stuffing box seal, the cuts on the rings must be ____ to avoid excessive leaking.&#10;A) alternated&#10;C) glued&#10;B) spliced&#10;D) closed

Accepted Answer

Alternating the cuts on the packing rings will create a more effective seal by allowing the rings to overlap and compress against each other, reducing the risk of excessive leaking. Splicing or gluing the rings together is not typically recommended as it can compromise the integrity of the packing and reduce its effectiveness. Closing the cuts entirely would prevent the rings from compressing and would likely result in excessive leaking.

Question 5

What is a seal used for?

Accepted Answer

The answer of What is a seal used for?...

Question 6

An O-ring is referred to as what type of seal packing?&#10;A) mechanical&#10;C) squeeze&#10;B) rubber&#10;D) compression

Accepted Answer

The answer of An O-ring is referred to as what...

Question 7

Which of the following is not a type of packing?&#10;A) twisted fiber packing&#10;C) braid-over-braid&#10;B) square-braided packing&#10;D) intertwisting

Accepted Answer

Intertwisting is not a type of packing. Twisted fiber packing, square-braided packing, and braid-over-braid are all types of packing used in sealing applications.

Question 8

What is commonly referred to as an oil seal?&#10;A) O-ring&#10;C) radial lip seal&#10;B) packing seal&#10;D) mechanical seal

Accepted Answer

A radial lip seal is commonly referred to as an oil seal. O-rings are circular seals and packing seals are used to prevent leaks in pipes and other equipment. Mechanical seals are used in rotating machinery to prevent leakage between two surfaces.

Question 9

Compression packing is mostly made of various types of fibers. These fibers may include vegetable fibers, mineral fibers, animal fibers, and ____.&#10;A) polycarbonate fibers&#10;C) recycled fibers&#10;B) cotton fibers&#10;D) synthetic fibers

Accepted Answer

Synthetic fibers are commonly used in compression packing due to their high resistance to heat, chemicals, and wear. They also have a longer lifespan compared to other types of fibers.

Question 10

When a packing material is covered with graphite, it is said to be ____.&#10;A) lubricated&#10;C) sealed&#10;B) graphited&#10;D) indestructible

Accepted Answer

When a packing material is covered with graphite, it is said to be graphited.

Question 11

The ____ is a seal in which the rotating mating ring is internally mounted in the stuffing box.&#10;A) outside seal&#10;C) inside seal&#10;B) O-ring&#10;D) double seal

Accepted Answer

The answer of The ____ is a seal in which...

Question 12

Which of the following is not a type of radial lip seal?&#10;A) pressed&#10;C) cased&#10;B) bonded&#10;D) dual-element

Accepted Answer

The answer of Which of the following is not a...

Question 13

The ____ is a mechanical seal in which the rotating mating surface is mounted externally from the stuffing box.&#10;A) radial lip seal&#10;C) double seal&#10;B) outside seal&#10;D) inside seal

Accepted Answer

The answer of The ____ is a mechanical seal in...

Question 14

A(n) ____ is basically two inside seals that are in a back-to-back orientation.&#10;A) outside seal&#10;C) double seal&#10;B) packing seal&#10;D) inside seal

Accepted Answer

The answer of A(n) ____ is basically two inside seals...

Question 15

Which of the following types of packing is the strongest?&#10;A) twisted braid&#10;C) braid-over-braid&#10;B) square braid&#10;D) interlocking

Accepted Answer

The answer of Which of the following types of packing...

Question 16

Of the seals that are listed, which will provide both retention and exclusion?&#10;A) pressed radial lip seal&#10;C) cased radial lip seal&#10;B) bonded radial lip seal&#10;D) dual-element radial lip seal

Accepted Answer

The answer of Of the seals that are listed, which...

Deck 10: Seals and Packing