1-47.
Refer to figure 2-18 in your
textbook.
If this were a
practical situation, the pressure
in chamber A would be greater
than that in chamber B by the
amount of pressure required to
1.
absorb inertia
2.
prevent the fluid from moving
3.
overcome friction
4.
raise the pressure at an
intermediate point
Learning Objective:
Recognize
similarities and differences
between pneumatic and hydraulic
fluid power systems, and indicate
operating characteristics and
component functions of basic
fluid power systems.
1-48.
The similarity between hydraulic
and pneumatic fluid power systems
is correctly indicated by which
of the following statements?
1.
The basic components of the
systems are essentially the
same
2.
Both systems depend upon
internal lubrication by the
system fluid
3.
Both 1 and 2 above correctly
indicate the similarity
4.
The
basic components of the
systems are identical and
interchangeable
1-49.
Which component of a hydraulic
fluid power system performs the
same function as the receiver in
a pneumatic fluid power system?
1.
Reservoir
2.
Compressor
3.
Actuator
4.
Selector valve
Learning Objective:
Identify the
characteristic of liquid that
makes it desirable for use in
hydraulic systems and properties
and characteristics that must be
considered in selecting a
hydraulic liquid for a particular
system, including related data.
1-50.
Liquids rather than gases are
used in hydraulic systems because
liquids are
1.
more compressible
2.
less compressible
3.
more expensive
4.
less corrosive to system
components
1-51.
A liquid that is satisfactory for
use in a hydraulic system
provides
1.
a low viscosity index, good
sealing quality, and
lubricity
2.
a high viscosity index, good
sealing quality, and a low
flashpoint
3.
good lubrication and sealing
qualities, and a viscosity
that does not result in an
increase in flow resistance
in system piping
4.
good lubrication and a
viscosity that decreases as
temperature increases
1-52.
The viscosity reading of a liquid
is expressed as Saybolt universal
seconds (SUS), which represents
the time, in seconds, it takes
for 60 cubic centimeters of the
liquid at a specified temperature
to pass through an orifice of
given diameter.
1.
True
2.
False
1-53.
A low V.I. indicates that a
liquid will
1.
maintain a constant viscosity
over a wide temperature range
2.
vary greatly in viscosity
with changes in temperature
3.
vary only slightly in
viscosity with changes in
temperature
4.
have a response to
temperature changes very much
like the response of
paraffinic oil
6