In order to make the working mechanism can stay at any position reliably, for instance payload of a hydraulic crane, and the working mechanism will not slip under the condition of force, what circuitis usually used? ()
A. unloading loop
B. pressure regulation circuit;
C. pressure counter-balance circuit;
D. back pressure circuit.
查看答案
The speed regulating valve (installed between the hydraulic pump and the actuator) regulates ____ to control the speed of the actuator. ()
A. hydraulic pump flow
B. oil discharged from actuator
C. actuator supply pressure
D. the area of its opening
which fast speed circuit is most suitable for the situation where the system needs large flow in a short time? ()
A. Hydraulic cylinder differential connection fast speed circuit
B. Double pump oil supply fast speed circuit
C. Speed increasing cylinder fast speed circuit
D. Fast speed circuit with accumulator
The unloading circuit is used for ().
A. reducing flow loss
B. reducing pressure loss
C. reduce power loss
D. increase system heating
The volumetric speed control circuit with constant power output is ( ).
A. variable displacementpump--variable displacement motor circuit
B. fixed displacement pump--variable displacement motorcircuit
C. variable displacement pump--fixed displacement motorcircuit
D. fixed displacement pump--fixed displacement motorcircuit
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