3-55.
You are reassembling a vital
component which uses a copper
sealing ring and discover there
is not a new replacement ring.
Which, if any, of the following
steps should you take?
1.
Reinstall the old ring after
inspecting it for damage
2.
Install an O-ring that is
compatible with the fluid
used in the system
3.
Reinstall the old ring after
it has been annealed
4.
None of the above
3-56.
Although it has many of the
characteristics required in an
effective seal , which of the
following materials is not used
as packing material in a system
in which petroleum-base fluid is
used?
1.
Cork
2.
Asbestos
3.
Natural rubber
4.
Synthetic rubber
3-59.
3-60.
3-61.
3-62.
Learning Objective:
Recognize
functions,
identification
procedures, inspection and
installation techniques, and
characteristics of various types
of seals.
3-63.
3-57. Which of the following statements
is NOT true of T-seals?
1.
T-seals provide a positive
seal at low pressure
2.
There is no military standard
part numbering system to
identify T-seals
3.
The dash (-) numbers used to
identify the size of T-seals
are part of a preliminary
numbering system
4.
The Navy has created a
numbering system to identify
T-seals for hydraulic
actuators
3-50.
To obtain the correct squeeze or
clearance on V-ring packing,
shims or spacers are used to
adjust the packing gland depth.
1.
True
2.
False
3-64.
Regardless of its condition, an
O-ring must be discarded if it
cannot be positively identified.
1.
True
2.
False
Which of the following items can
be used to identify replacement
O-rings?
1.
Allowance parts lists (APLs)
2.
Technical manuals
3.
System drawings
4.
All of the above
What is the basis for computing
the age of an O-ring?
1.
Service life
2.
The cure date
3.
Replacement schedule
4.
Operational conditions
What is the expiration date of an
O-ring which was cured on 13 July
1990 and has a 4-year shelf life?
1.
30 September 1994
2.
31 August 1994
3.
31 July 1994
4.
13 July 1994
Which of the following materials
should NOT be used to fabricate
tools for use in removing and
installing O-ring and backup
rings?
1.
Wood
2.
Steel
3.
Brass
4.
Phenolic rod
Why are O-rings sometimes rolled
on a cone or dowel?
1.
To expose the manufacturers
identification code
2.
To expose and stretch the
inner diameter surface for
inspection
3.
To determine their breaking
point
4.
To condition them before
installation
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