21 - Eat 6 Flashcards
A _________ strainer is called a filter. A) Fine B) Coarse C) Media D) Absorbent
B) Coarse pg 138 Notes: Usually constructed of fine mesh wire, with pores larger than 50 microns.
A particle one micron in size equals _______ inch. A) .000583 B) .7053 C) .00275 D) .00039
D) .000039 pg 112 Notes: 39 millionths of an inch
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 pg 144 Notes:
They provide electrical or visual indication when element is near end of life.”
Three general areas for locating a filter are inlet, pressure and ______ lines. A) Pilot B) Return C) Flow D) Relief
B) Return pg 134 & 135
What type of filter element provides precise control of pore size? A) Cylindrical B) Sub-plate C) Surface D)Pleated
C) Surface pg 142
Filtering materials are classified as absorbent or? A) Mesh B) Absorbent C) Fiber D) Depth-type
B) Adsorbent pg 142
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 pg 112
Hydraulic circuit components fail as a result of contamination and ______. A) Design B) Phase C) Static D) ISO
A) Design pg 113
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 Also called “Intermittent or Transitory”
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 Notes:
To minimize energy consumption, the average pressure drop across filters should be as low as possible.
(Pg. 141, Pressure Drop)
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 pg 119
After hydraulic system assembly, tubing must not be soldered, welded or _____. A) Flared B) Threaded C) Brazed D) Plugged
C) Brazed pg 131
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 pg 133
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 pg 134
The higher the sieve or mash number the ________ the screen. A) Thicker B) Finer C) Thinner D) Coarse
B) Finer pg 138
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 pg 141
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 pg 142
Hydraulic fiberglass filter elements tend to have a ________ filtering structure. A) Stainless B) Mesh C) Surface D) Pleated
D) Pleated pg 142
To eliminate the possibility of the filter element collapse, a _______ valve is used. A) Bypass B) Inlet C) Rotary D) Check
A) Bypass pg 144
To monitor initial and sub sequential levels of contamination ________ points must be provided. A) Filter B) Sampling C) Static D) Dynamic
B) Sampling
