Assignment 2
Textbook Assignment:
Hydraulic Fluids, chapter 3, pages 3-6 through 3-11;
Pumps, chapter 4; and Fluid Lines and Fittings, chapter 5,
pages 5-1 through 5-11.
2 - 5.
Compatibility of hydraulic liquid
Learning Objective:
Identify
types, characteristic,
origin,
control, and checks for various
hydraulic system contaminants.
2-1. Trouble develops in a hydraulic
system when the fluid becomes
contaminated as the result of
1.
system component
deterioration
2.
friction at hotspots
3.
abrasive wear
4.
any action that places
foreign matter in the fluid
2-2. By which of the following ways
2-6.
may air enter into a hydraulic
system?
1. Through improper maintenance
2.
Past leaky seals in gas-
pressurized accumulators
3.
Past actuator piston rod
seals
2-7.
4.
Each of the above
2-3. Water contamination of a
hydraulic system is NOT a major
concern since its presence aids
in reducing the flammability of
the fluid.
1.
True
2.
False
2-8.
2-4. Chemical contamination of
hydraulic liquid by oxidation is
indicated when the liquid
contains which of the following
materials?
1.
Sludge
2.
Asphaitine particles
3.
Organic acids
with the seals and hoses in a
system prevents which of the
following problems from
occurring?
1.
Gum formation around the
seals and within the hoses
2.
Deposits
of contaminants on
the seals and within the
hoses
3.
Condensation of moisture
within the system
4.
Chemical reaction between the
liquid acid the seal or hose
material and consequent
breakdown of these parts
All of the following contaminants
are abrasive EXCEPT
1.
lint
2.
rust
3.
sludge
4.
sand particles
Whenever drained or used
hydraulic fluid is returned to a
system, straining is necessary
only if the cleanliness of the
storage container is
questionable.
1.
True
2.
False
Which of the following agents
should parts of a hydraulic
component be cleaned with prior
to being assembled?
1.
An approved dry-cleaning
solvent
2.
Trichlorotrifluoroethane
3.
Chlorinated solvents
4.
Trichlorofluoromethane
4.
Each cf the above
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