2-20.
2-21.
2-22.
2-23.
Which type of gear-type rotary
pumps discharges the smoothest
fluid flow?
1.
Spur
2.
Helical
3.
Herringbone
4.
Crescent
Why are helical gear pumps
classified as external gear
pumps?
1.
Both sets of teeth project
inward toward the center of
the gears
2.
Both sets of teeth project
outward from the center of
the gears
3.
The teeth of the interior
gear project inward toward
the center of the gears, and
the teeth of the exterior
gear project outward from the
center of the gears
4.
The teeth of the interior
gear project outward from the
center of the gears, and the
teeth of the exterior gear
project inward toward the
center of the gears
Refer to figure 4-2, view B, in
your textbook,
What determines
the volume delivery of this pump?
1.
The size of the crescent
2.
The size of the internal gear
3.
The speed of rotation of the
crescent
4.
The speed of rotation of the
drive gear
Refer to figure 4-7 In your
textbook.
The vanes of the lobe
pump are used for which of the
following purposes?
1.
To reduce wear of the pump
caused by surface to surface
contact
2.
To provide a good seal
between the lobes and the
point of lobe junction in the
center of the pump
3.
To provide a good seal
between the lobes and the
chamber
4.
To do both 2 and 3 above
2-24.
2-25.
The pump illustrated In figure
4.9 of your textbook is
designated as unbalanced because
the pumping action is done by one
side of the shaft and rotor.
1.
True
2.
False
Which, if any, of the following
statements is true of a screw
pump ?
1.
Its performance is based on
the fluid s viscosity
2.
It is very efficient
3.
The idler rotors are
connected by gears
4.
None of the above
Learning Objective:
Recognize
functions,
principles of
operation,
and construction
features of various types of
reciprocating pumps.
REFER TO FIGURE 4-10 IN YOUR,TEXTBOOK IN
ANSWERING QUESTIONS 2-26 AND 2-27.
2-26.
This type of pump is used in some
aircraft hydraulic systems to
provide a source of hydraulic
power for what purpose(s)?
1.
Emergencies
2.
Testing certain subsystems
during preventive maintenance
3.
Determining the causes of
malfunctions in certain
subsystems
4.
All of the above
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