Module 3 Flashcards
a tank for accumulating and storing a supply of hydraulic fluid at atmospheric pressure
Fluid reservoir
a device in the reservoir tank that helps circulate returning fluid
Baffle
a unit that stores hydraulic fluid under pressure until the system needs it
Accumulator
Contaminants suspended in hydraulic fluid settle to the bottom of the reservoir to form _____.
Sludge
The bottom of a reservoir should be sloped toward one end or have a low spot called the _____.
Sump
In order to help circulate treurning fluid around the inside of the tank, a reservoir may contain a(n) _____.
Baffle
Fluid lines carrying large amounts of air as they return to the reservoir should discharge onto a(n) _____.
Splash Plate
Hydraulic fluid temperatures should be maintained at about _____ F.
100 to 120
One of the easiest ways to cool the reservoir is to use _____.
Compressed Air
In most liquid-cooled heat exchangers, the heat transfer occurs between two fluids that flow in the _____ direction.
Opposite
If only a small amount of cooling is required, a(n) _____ tube can be installed in the return line.
Finned
The function of an accumulator is to _____ hydraulic fluid for the system under pressure.
Store
The fluid capacity of a weight-loaded accumulator generally is not much more than _____ gallon(s).
1
The use of spring-loaded accumulators is limited to _____-pressure applications.
Low
Nonseparated-gas accumulators are not recommended for use in high-pressure applications. Why?
Because the gas is absorbed by the fluid
A bladder accumulator has a fluid capacity of approximately _____ gallon(s).
20
Diaphragm accumulators should not be used for high-pressure applications because the diaphragm _____ during operation.
Flexes
Gas-charged piston accumulators are not as effective as bladder accumulators in removing _____ from the system.
Pulsations
A differential piston accumulator can also abe used as a pressure _____ or fluid _____.
Booster; Intensifier
In order to separate contaminants from hydraulic fluid in the reservoir, the fluid must be
a. air-entrained
b. moved rapidly
c. moved slowly
d. swirled
c. moved slowly.
The bottom of a hydraulic fluid reservoir should not be
a. equipped with a drain
b. flat
c. sloped
d. V-chaped
b. flat.
A hydraulic reservoir relies on an interior baffle to
a. help heat transfer
b. reduce fluid surface area
c. strengthen the reservoir walls
d. support interior piping
a. help heat transfer.
What method is not used to maintain the temperature of hydraulic fluid at an acceptable level?
a. Reducing pipe friction
b. Reducing pump work
c. Using a reservoir with large surface area
d. Using a reservoir with thick side walls
d. Using a reservoir with thick side walls.
Most liquid-cooled heat exchangers transfer heat by means of
a. direct contact of the fluids
b. forced-air cooling
c. separated fluids moving in the opposite directions.
d. separated fluids moving in the same direction
d. separated fluids moving in the opposite directions.
For what reason is an air breather installed on a reservoir?
a. Control air pressure
b. Control humidity
c. Maintain vacuum
d. Prevent pressure buildup
d. Prevent pressure buildup
An accumulator is used in a hydraulic system for all of the following reasons except to
a. absorb hydraulic shocks
b. store pressurized fluid
c. supply fluid on demand
d. take the place of the pump
d. take the place of the pump.
Because of their nonmechanical design, non separated-gas accumulators should not be used with
a. high-speed pumps
b. large volumes
c. low pressures
d. low volumes
a. High-speed pumps.
Which of the following is the correct procedure to use when charging a bladder accumulator?
a. Preload nitrogen, drain fluid
b. Preload nitrogen, then fluid
c. Preload fluid, drain nitrogen
d. Preload fluid, then nitrogen
b. Preload nitrogen, then fluid.
A distinctive characteristic of a differential piston accumulator is that it reduces
a. air pressure
b. fluid volume
c. the pressure ratio
d. vacuum
b. fluid volume.
