1-54.
Which of the following statements
is NOT a true statement of fluid
viscosity?
1.
An ideal fluid viscosity
remains constant throughout
temperature changes
2.
The average hydraulic fluid
has a relatively low
viscosity
3.
There is a large choice of
liquids available for the
viscosity range required
4.
Liquids derived from the same
source have equal resistance
to heat
1-55.
The film strength and lubricating
qualities of a liquid are
directly related to the liquids
physical properties.
1.
True
2.
False
1-56.
Which statement about a hydraulic
liquid that is continuously
subjected to high temperature
conditions is true?
1.
It accumulates moisture
2.
It changes unfavorably in
composition
3.
Its life is unaffected by the
hours of use
4.
The carbon and sludge formed
in it are of little concern
if the reservoir temperature
remains normal
IN QUESTIONS 1-57 THROUGH 1-59, SELECT
FROM COLUMN B THE DEFINITION OF EACH
PROPERTY OF LIQUIDS LISTED IN COLUMN A.
A. Properties
B. Definitions
1-57.
Fluidity
1.
1-58.
Viscosity
1-59.
Chemical
stability
2.
3.
4.
The internal
resistance
that tends
to prevent
liquids from.
flowing
The quality,
state, or
degree of
liquids
being
poisonous
The physical
property
that enables
liquids to
flow
The ability
of liquids
to resist
oxidation
and
deteriora-
tion for
long periods
1-60.
The desirable flashpoint of a
hydraulic liquid is one which
provides a
1.
low degree of evaporation and
good resistance to combustion
2.
high degree of evaporation
and poor resistance to
combustion
3.
low degree of evaporation and
low resistance to combustion
4.
high degree of evaporation
and high resistance to
combustion
1-61.
Hydraulic liquid must possess
which of the following
properties?
1.
Chemical stability and
freedom from acidity
2.
Lubricating ability and
proper viscosity
3.
Minimum toxicity and high
flashpoint
4.
All of the above
7