4-16.
Which of the following factors
must be considered In determining
the reservoir capacity of a
hydraulic system?
1.
The thermal expansion of the
fluid
2.
Whether the system is fixed
or mobile
3.
The volume of fluid required
by the system
4.
All of the above
4-17.
Why must the reservoir of an
aircraft designed for high-
altitude operations be
pressurized?
1.
To maintain a net positive
suction head to the pump
2.
To use atmospheric pressure
to assist fluid flow
3.
To prevent the fluid from
congealing at high altitudes
4.
To vent the system during
periods of high fluid demand
4-18.
A pressurized reservoir may be
Instead at a level below the pump
suction and still maintain a
positive flow of fluid to the
pump.
1.
True
2.
False
Learning Objective:
Identify
operating principles and
applications of accumulators.
4-19.
Hydraulic systems are equipped
with one or more accumulators
that serve to perform which of
the following functions?
1.
To provide pressure for
emergency operation of the
system in the event of system
failure
2.
To act as a buffer and absorb
surges and shock pressures
that might damage pipes and
other components of the
system
3.
To equalize and readjust for
any pressure losses in the
system due to small leaks and
thermal reaction of the fluid
4.
All of the above
4-20.
Which of the following statements
best describe(s) the advantage a
vented tailrod accumulator has
over a floating piston
accumulator?
1.
2.
3.
4.
The tailrod allows the
accumulator to be used as a
hydraulic actuator, thus
eliminating the number of
system components requiring
maintenance
The vented tailrod
accumulator has the space
between the piston seals
vented to the atmosphere,
causing air or oil leakage
past the seals to be apparent
Both 1 and 2 above
The vented tailrod
accumulator has a gauge that
provides a quick indication
of the amount of fluid in the
accumulator
4-21
Why does a bladder-type, air-
operated accumulator have a very
high volumetric efficiency?
1.
The bladder is larger
bottom and the rubber
thinner at the top
2.
The bladder is larger
top and the rubber is
at the bottom
3.
The bladder is larger
top and the rubber is
at the top
4.
The bladder is larger
bottom and the rubber
thinner at the bottom
at the
is
at the
thinner
at the
thinner
at the
is
4-22.
Which of the following statements
describe(s) how an excessive
amount of gas is prevented from
being entrained In direct-
contact accumulators?
1.
Safety fluids are used in
this type of accumulator
2.
The fluid port is located at
the bottom of the accumulator
3.
These accumulators are
generally not used for
pressures over 1200 psi
4.
All of the above
4-23.
Both the bladder-type accumulator
and the diaphragm accumulator
operate in a similar manner.
1.
True
2.
False
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