seals test teacher questions

Question 1

Compression packing in a pump. Stuffing box is an example of.?
positive external seal
non positive seal
positive internal seal
static seal

Answer 1

static seal

Question 2

automatic packing are special profiled rings with interference fir on the shaft , it seals in what direction?

Answer 2

seals in only one direction

Question 3

O-rings can be used as what type of seals?

Answer 3

made from synthetic rubber can be used as a dynamic or static seal

Question 4

Dynamic seals may be positive or?

Answer 4

non postive

Question 5

Compression packing in a pump. Stuffing box is an example of.
A- positive external seal
b-postive interal seal
c-non positive seal
d-static seal

Answer 5

non positive

Question 6

Seals between moving and stationary surface frequently helped by system. Pressures are called ?

Answer 6

dynamic seal

Question 7

Seals between two surfaces which have no relative motion are called

Answer 7

static seal

Question 8

This type of packing is called unbalanced, and it seals only one diameter

Answer 8

cup packing

Question 8

O-ring used in conjunction with anti-extrusion rings or back up washers can withstand pressures up to

Answer 8

3000 psi

Question 9

How much larger than the O-ring is the groove in which it sits

Answer 9

150%

Question 10

Standard O-rings are related to____ psi?

Answer 10

1500 psi

Question 10

What percent of O-ring diameter should diametral squeeze, be held

Answer 10

10%

Question 11

This type of parking is used in sets of three or more rings, depending on working pressure

Answer 11

v packing (chevron packing)

Question 12

This type of packing must be used with shaped male and female, adaptor rings

Answer 12

v packing

Question 13

This type of packing normally does not steal until the heel diameter has been expanded

Answer 13

cup packing

Question 14

This type of packing uses an adjustable gland follower, as well as spring force to adjust the compressive force on the packing

Answer 14

v ring packing

Question 15

Seals use for Pistons win. Rapid travel, and frequent cycling are needed or called.

Answer 15

piston rings

Question 16

This type of cell is a low pressure seal used, mainly with rotating shafts

Answer 16

lip seal

Question 17

The pressure on the lip seals will be at a maximum pressure of

Answer 17

min 2psi
max 10 psi

Question 18

When replacing gasket material between machine parts, it is important that the material be

Answer 18

original thickness

Question 19

This component distributes sealing liquid under pressure to the packing and prevents air filtration into the pump casing

Answer 19

lantern ring

Question 19

When packing seals on both the ID and OD, it is referred to as

Answer 19

balanced seal

Question 20

When installing lips sealed the position of the lip is very important in which direction should the lip be facing in a contaminated environment?

Answer 20

facing the environment

Question 21

This seal is an extremely efficient axle seal, being more effective than any other, dynamic seal, preventing leakage

Answer 21

mechanical seal