HYDRAULIC PUMPS PRACTICE EXAM QUESTIONS WITH ALL CORRECT ANSWERS GRADED A+
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Course
HYDRAULIC PUMPS
Institution
HYDRAULIC PUMPS
HYDRAULIC PUMPS PRACTICE EXAM QUESTIONS WITH ALL CORRECT ANSWERS GRADED A+
A(n) valve found in some power units is set at a pressure slightly higher than the normal system operating pressure for protection if the relief valve fails. - Answer- safety
A(n) pump design uses the up-and-down linear...
HYDRAULIC PUMPS PRACTICE EXAM
QUESTIONS WITH ALL CORRECT
ANSWERS GRADED A+
A(n) valve found in some power units is set at a pressure slightly higher than
the normal system operating pressure for protection if the relief valve fails. - Answer-
safety
A(n) pump design uses the up-and-down linear motion of a piston in a cylinder
to move fluid through the unit. - Answer-reciprocating
The pump that includes a mechanism allowing an operator to easily vary the size of the
pumping chamber is classified as a(n) -delivery design. - Answer-variable
The most popular hydraulic pump uses gears as the primary elements of the
pumping mechanism. - Answer-external
The maximum operating pressure for systems using gear pumps may be as high as
psi, although the typical pressure for systems using these pumps is less. -
Answer-3000
What are the two internal gear pump designs found in hydraulic systems? - Answer-A.
Gerotor and B. crescent.
The internal gear pump that has a maximum operating pressure rating of 500 psi or less
is the design. - Answer-crescent
Which vane pump achieves a pumping action because the centers of the pump rotor
and the cam ring are off center? - Answer-Unbalanced-vane pump.
Which vane pump achieves a pumping action by a elliptical opening in the cam ring,
which allows two inlet and two discharge points per pump revolution? - Answer-
Balanced-vane pump.
Piston pumps can function in systems requiring operating pressures as high as
psi or higher in some cases. - Answer-10,000
The axes of the cylinder barrel and the power input shaft of the -piston pump are
concentric. - Answer-inline axial
Components called act as the bearing surface between the pistons and the
swash plate of the inline axial-piston pump. - Answer-piston shoes
, In the bent-axis piston pump design, the cylinder barrel is turned by power delivered
through a(n) attached to the input shaft of the pump. - Answer-universal joint
The hydraulic pump that is usually considered to have the highest continuous pressure
capability uses the -piston design. - Answer-radial
The type of pump that delivers the best pulse-free flow of fluid throughout the full range
of operating speeds uses a(n) pumping mechanism design. - Answer-screw
In a centrifugal pump, the primary element of the pumping mechanism is called a(n)
. - Answer-impeller
Propeller and jet pumps are non-positive displacement pumps. List three typical
applications for these pumps. - Answer-(any three) A. Transporting fluid, B. evacuating
system reservoirs, C. evacuating system sumps, and D. shallow water wells.
Describe how variable flow can be achieved in an unbalanced-vane pump. - Answer-By
incorporating a movable cam ring.
The pressure-compensating feature of a hydraulic pump is available only on those
pump designs that are also capable of -flow delivery. - Answer-variable
How is pressure balancing achieved in the balanced-vane pump design? - Answer-
Pressure balancing is inherent in the design due to the crescent-shaped pumping
chamber that allows two inlet and two outlet ports.
designs incorporate two pumps in a single case and sometimes also include a
relief and unloading valve. - Answer-Dual-pump
Overall efficiency and volumetric efficiency are typically found in the section of
pump information sheets. - Answer-performance data
The general hydraulic horsepower formula can be simplified to pump output (gpm)
multiplied by system pressure (psi) divided by a constant of . - Answer-1714
The inlet line of a hydraulic pump should be sized to eliminate high fluid velocities and
pressure drops. What is the minimum size for the inlet line? - Answer-It should be no
smaller in diameter than the diameter of the pump inlet.
The two most common prime movers used in a hydraulic system are a(n) and
a(n) . - Answer-electric motor; internal combustion engine
The is the component in the power unit that stores hydraulic fluid when it is not
being circulated through the system. - Answer-reservoir
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