液压与气压传动考试题（Hydraulic and pneumatic test）.docVIP

液压与气压传动考试题（Hydraulic and pneumatic test） Hydraulic and pneumatic transmission test First, fill in the blanks (1 points per minute, 20 points) 1. liquid viscosity has three representation methods: dynamic viscosity, kinematic viscosity, and Coriolis viscosity. 2., there are two kinds of liquid flow, namely laminar flow, turbulent flow and. 3.. Static pressure is the basic equation of liquid. When atmospheric pressure is called table pressure, P is called absolute pressure. 4. the volumetric efficiency of the hydraulic pump is the ratio of the actual flow to the theoretical (sequential) flow 5, according to the circulation of oil in the oil circuit can be divided into open loop and closed loop. 6. throttle speed control loop is composed of quantitative pump, throttle (or slow speed) valve and so on. 7, the variable speed circuit composed of variable pump and quantitative motor has its constant torque characteristic. 8., according to the principle of operation, air compressor can be divided into two types of displacement and speed 9. in order to ensure the pneumatic system normal work, need at the outlet of the air compressor after the installation of the cooler, precipitated in water vapor, and dryer installed in the outlet of the gas tank, and further remove the moisture in the air. 10. pneumatic systems need to be fitted with oil mist for lubrication of various pneumatic components. Two, multiple-choice questions (4 points per subject, a total of 1., the cross section is a rectangular section (d long, B wide), and its hydraulic diameter is (B). A. B. C. D. 2., there are many ways to pump gear leakage, the most serious of which is (A). A. axial clearance B. radial clearance C. engagement D. unloading tank 3., the throttling speed regulating circuit that can bear the negative load is (C). A. intake circuit throttling speed regulating circuit B. side circuit throttle speed regulating circuit Throttle return circuit of C. return circuit D. throttling speed control circu