Hydraulics Test Flashcards
The meter out type curcuit for a linear actuator will control actuator speed and…
Can create higher than system relief pressure
What is this?
Pressure intensifier
A DCV having a float center spool is best suited for applications using…
A pilot operated check valve
Osillating motors in a hydraulic system are catagorized as being
Rotary Actuators
Describe the symbol
Gas charged accululator
Where increased force is required and bore size must remain the same a________ cylinder is used.
Tandem
Piloted operated relief valves have a orifice in the spool. What is the purpose of this
B. To allow oil pressure above the spool to balance it.
To create a positive seal to the cam ring vane type pumps use intra-vanes, pin-vanes, spring loaded vanes and
C. Centrifugal force
Thermal overload protection on a hydraulic system is provided by fitting which of the listed devices to the reservoir?
C. Temperature Switch
Describe this symbol
Mechanically Weighted Accumulator
A pilot operated relief valve has a plugged spool drain passage. How will this affect the valve operation?
C. Will not open at any pressure
A double rod linear extends and retracts at
A. Same speeds
Pressure differential in a hydraulic system indicates that
C. Working energy is present in the form of a moving pressurized liquid
What would a pressure drop in a hydraulic line indicate in a system that seems to be operating normally
D. That an actuator is moving
A positive displacement pump develops constant flow and will apply whatever_____ is needed to overcome any _______.
C. Pressure, resistance
Fluid resistance to flow in a hydraulic system is turned into
C. Heat
In hydraulics, three conditions are measured and monitored to evaluate preformance. These are
C. Pressure, flow and temperature
When the maximum system pressure has been reached in a accumulator circuit that is controlled by a unloading relief valve, the unloading relief valve will
D. Direct the full pump output to the tank at very low pressure.
What is the best connection method for pipe that has to be frequently disassembled
A. Flange
A general start up procedure after maintenance of a hydraulic system includes fluid level check, secure fasteners, safety responsibilities, and
A. Bleed and prime components
A pump manufacturer specifies the inlet pressure to be 4” Hg on one of their pumps. This means that
D. Less than 4” Hg needs to show on the vacuum gauge.
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