2ND 21 Flashcards
A strainer is called a _______ filter.
a) Fine
b) Coarse
c) Media
d) Absorbent
b) Coarse
A particle one micron in size equals _______ filter.
a) .000583
b) .7053
c) .00275
d) .000039
d) .000039
A filter designed to signal the operator when the element needs cleaning is called a(n) __________ filter.
a) Circulating
b) Off-line
c) Absorbent
d) Indicating
d) Indicating
Three general areas for locating a filter are inlet, pressure and _________ lines.
a) Pilot
b) Return
c) Flow
d) Relief
b) Return
What type of filter element provides precise control of pore size?
a) Cylindrical
b) Sub-plate
c) Surface
d) Pleated
c) Surface
Filtering materials are classified as absorbent or ________ .
a) Mesh
b) Adsorbent
c) Fiber
d) Depth-type
b) Adsorbent
What type of filter passes the entire flow entering its inlet through the element?
a) Proportional flow
b) Indicator type
c) Full flow
d) Reverse flow
c) Full flow
The smallest particle an eye can see is approximately ________ microns.
a) 25
b) 40
c) 50
d) 75
b) 40
Hydraulic circuit components fail as a result of contamination and _________ .
a) Design
b) Phase
c) Static
d) ISO
a) Design
If the fluid within the hydraulic pump clearances becomes heavily contaminated, ___________ will probably occur.
a) Cavitation
b) Fatigue
c) Aeration
d) Seizure
d) Seizure
Which of the following is not a mechanism of wear?
a) Adhesion
b) Filtration
c) Fatigue
d) Cavitation
b) Filtration
Contamination blockage which prevents and then allows a solenoid spool to shift is called a _______ failure.
a) Degradation
b) Catastrophic
c) Transient
d) Critical
c) Transient
In increase in the pressure differential across a filter will cause a(n) _______ in power consumption.
a) Increase
b) Half-wave
c) Decrease
d) Beta ratio
a) Increase
When specifying the correct filter for a given application, which of the following would not be considered?
a) Weight of particles to be held
b) Flow rate capacity
c) Flow sampling method
d) Pressure drop through element
c) Flow sampling method
Which is not a source of contamination in a hydraulic system?
a) Ingressed
b) Entrained
c) Internally
d) Built-in
b) Entrained
The preferred location for dynamic sampling is directly _______ of the return line filter.
a) Downstream
b) Midstream
c) Center
d) Upstream
d) Upstream
After hydraulic system assembly, tubing must not be soldered, welded or ________ .
a) Flared
b) Threaded
c) Brazed
d) Plugged
c) Brazed
When transferring clean oil, the transfer pump should be equipped with a _________ filter.
a) Beta
b) Coarse
c) 5 micron
d) Mesh
c) 5 micron
Filters that can trap much smaller particles than inlet line strainers are _______ _______ filters.
a) Pressure line
b) Return line
c) Off line
d) Pilot line
a) Pressure line
The higher the sieve or mesh number the _________ the screen.
a) Thicker
b) Finer
c) Thinner
d) Coarse
b) Finer
To test for filter material compatibility, the filter element is immersed for ____ hours in system fluid.
a) 59
b) 63
c) 84
d) 72
d) 72
In cylindrical shaped filter elements, ________ tubes are used to support the media against pressure differential.
a) Stainless
b) Flared
c) Perforated
d) Bypass
c) Perforated
Hydraulic fiberglass filter elements tend to have a _________ filtering structure.
a) Stainless
b) Mesh
c) Surface
d) Pleated
d) Pleated
To eliminate the possibility of filter element collapse, a __________ valve is used.
a) Bypass
b) Inlet
c) Rotary
d) Check
a) Bypass
To monitor initial and subsequent levels of contamination _______ points must be provided.
a) Filter
b) Sampling
c) Static
d) Dynamic
b) Sampling
