Hydraulics Flashcards
For extending use the______ Area
Cap
For retracting use the ____ Area
Net
100 degrees Celsius was considered the_______ ________ of water
boiling point
1 Bar = 14.5038 or ____ psi
14.5 psi
Kinetic Energy-Present in the Hydraulic System in the form of______ _______, also known as energy in motion.
fluid flow
Potential Energy-Present in the Hydraulic System in the form of Pressure, also known as _______ _________.
stored energy.
The smallest ______ visible to the naked eye is 40 micron
particle
Two important requirements for any inlet strainer:
- The strainer must be capable of passing the _______volume with the permitted inlet pressure drop for that pump.
- The strainer must provide bypass flow which is still within the limit.
Full pump volume
Sampling on Hydraulic Systems that do not have a defined oil change interval shall be taken ________
quarterly
Spectrometric analysis measures _______ _______ in the fluid by an
emission spectrometer in PPM.
wear metals
Oil samples shall be drawn from ________ machinery at normal operating temperatures and only from the designated sampling points.
running
After an oil and filter change, allow a minimum of ________ hours before sampling.
25 operating
Ingress Contamination- Referred to as __________ contamination, and it generally occurs during system service or maintenance.
environmental
Internally Generated Contamination-Created within the system by the ________ _______of hydraulic components.
moving parts
Inside diameter, designated by a dash number: The inside diameter (ID) of the hose is expressed in 16ths of an inch and is stenciled on the side of the hose. The inside of a -16 hose is ______.
1 inch.
Support clamps are not necessary for short lengths of hose; however hoses with an overall length ______ than 30 inches must be supported.
greater
About 5 to 8 percent of the flexible hose total length must be allowed as slack to provide freedom of movement________ ___________
under pressure
Flange JIC _____ is most commonly used in CG applications
37°
______ storage of hoses or hose assemblies should be in a cool, dry area, never exceeding 100o F.
Bulk
It is recommended that 5% of all hoses be changed each _______ to eliminate the need to change all hoses at the same time.
Quarter
Where a ______ test is not required, insert the annotation “NA.”
hydrostatic
An assembly mandrel is _______for all single-wire hoses in sizes 1⁄4 inch through 3⁄4 inch
required
Hydrostatic testing procedures require a test pressure of twice the ______ ______ pressure of the hose. The test pressure shall be held for approximately 5 minutes.
rated working
Those hose assemblies identified as “______ _______ ________” and operate in a low- pressure system (less than 150 psi) do not have to be hydrostatically tested.
Condition-Based Maintenance
The inner tube is a ______ rubber layer that is oil-resistant.
synthetic
The outer cover on a flexible hose_____ the reinforced layers
protects
The entire hose assembly _______ a hydrostatic test
requires
When a flexible hose is under pressure it _______ in the length and expands in diameter
contracts
Selecting the correct connector or _______ depends on Fluid Medium
fitting
_______ are either crimped or swaged onto the hose.
Fittings
Hose tags in an approved electronic database shall include scan-able _______ identifier
barcode
At sea level, ________ ________ is 14.7 pounds per square inch (psi).
atmosphere pressure
Atmospheric pressure _______ as elevation increases.
decreases
If ______ in any enclosed space is less than atmospheric pressure, the condition is known as a
vacuum.
pressure
Positive displacement pumps are used on all _______ systems
hydraulic
Pumps create flow; it is the ________ to flow that creates pressure.
resistance
The three most common flow control _______ are meter-out, meter-in, and bleed-off circuits.
circuits
Hydraulic symbols used in standard_______ are shown in the at-rest position.
drawings
The most common type of ________ circuit is the open-loop circuit.
hydraulic
Hydraulic _______ must be as incompressible as possible to transmit power.
fluid
two primary location for hydraulic filters are at the Pump discharge side and reservoir return and _____ pressure side and _____ pressure side
High and low
Three Hydraulic fluid type groups are petroleum, fire-resistant and ________.
biodegradable
Inlet strainers use a relatively coarse filtering element constructed of fine_____ ______.
wire mesh
The formation of sludge on _______ walls interferes with cooling.
reservoir
Most of the harmful contamination in hydraulic fluid is considerably _____ than 40 microns.
less
Hydraulic fluid temperature should be maintained_____ 110°F, which will help keep moisture out of the fluid and maintain acceptable viscosity.
above
The two purposes for a hydraulic accumulator are to act as a hydraulic ______ ________ and provide an auxiliary power source.
shock absorber
Nitrogen is the most common gas used in Coast Guard hydraulic _______.
accumulators.
Long hydraulic hoses should be _______ with the hoses pressurized.
inspected
When conducting a second level hydraulic hose inspection you are looking for ______, soft spots and accelerated deterioration.
bulging
2Q15 indicates on a hydraulic hose tag
second quarter, service life will expire 2015.
A hose’s service life date and _______ testing date is tracked in the Hose Log.
hydrostatic
fine tooth ________ or cut off wheel is commonly used when cutting a hose during fabrication.
hacksaw
When assembling a hose, it is important to mark the outer hose cover just below the fitting socket to ensure the hose ______ _____ ________during nipple installation.
did not slip
The two types of gears commonly found in hydraulic gear pumps are______ and Helical.
Spur
The following are elements of a vane pump
slotted rotor, _______and valve plate.
vane
Radial and Axial are the two designs of a hydraulic _______ pump.
piston
The angled swash plate creates the _______________ motion in the pistons and controls the displacement (output) of the pump by controlling the piston stroke length.
reciprocating
In a piping system _________ changes in direction can cause turbulent flow.
abrupt
Pressure override is the difference between _________ pressure and full-flow pressure.
cracking
In a Directional Control Valve, an ______\ Center has all ports open to each other.
Open
In a Directional Control Valve, a ______ Center has A, B, and T ports open to each other.
Floating
In a Directional Control Valve, a Closed Center has all ports ______.
blocked
In a Directional Control Valve, a _______ Center has P and T ports open to each other while the A and B ports are blocked.
Tandem
The Actuator in a hydraulic system converts hydraulic energy into _______ energy.
mechanical
The ______ created by a hydraulic motor is Torque.
force
Work is defined as _______ a force through a defined distance.
exerting
Power is the ______ of doing work.
rate
Take fluid samples from the _______-pressure side of a hydraulic system.
Low pressure
Shaft seal failure is another problem that is often _______ by either contamination and/or a damaged output shaft.
caused
The most common failure of hydraulic _______ is for one or more seals to begin leaking excessively.
cylinders
The two most common locations for failure are the ____ and piston seals.
Rod
_______ ______caused by cavitation and High vacuum pressure in the inlet side of the pump are two indications that the pump inlet strainer in a hydraulic system is clogged.
Noisy Pump
Two types of strainers used in Hydraulic Systems are Wire Mesh and _______ ______.
Edge Disk or full flow strainer
Full Flow and Proportional Flow are the two types of______ commonly used in hydraulic systems.
filters
NEVER work on a running system, except for _______ ________ adjustments (e.g., setting the pressure relief valve).
minor pressure
Excessive noise-Hydraulic fluid viscosity is too _____
high
