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单选题 Calculate area of a pipe if, flow rate is 18 L/min and flow velocity is 6 cm/s.( )
学科：流体力学与液压传动
时间：2024-11-17 15:55:00
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题目1单选题
How many strokes does a single piston pump need to discharge oil? ( )A. two strokesB. none of the aboveC. one strokeD. three strokes
题目2单选题
What is the function of a flow control valve? ( )A. flow control valve can control both direction and ressure of the oil fowB. flow control valve can control the pressure of oilC. flow control valve can adjust the flow rate of hydraulic oilD. flow control valve changes the direction of oil flow
题目3单选题
Calculate area of a pipe if, flow rate is 18 L/min and flow velocity is 6 cm/s.( )A. 60 cm2B. 62 cm2C. 50 cm2D. 66.66 cm2
题目4单选题
The energy conversion element for converting pressure energy into mechanical energy for driving working parts is ( )A. actuator elementB. control elementC. auxiliary elementD. power element
题目5单选题
The features of external gear pump include ( )A. the noise is small, the oil delivery is uniform, the volume is small and the weight is lightB. low cost, reliable work, weak self-priming ability, mostly used in low-pressure systemC. the method of reducing the oil inlet is usually used to reduce the radial imbalance forceD. the structure is compact and the flow rate is easy to adjust
题目6单选题
Compared with mechanical transmission, the advantages of hydraulic transmission include ( )A. smooth movementB. high efficiencyC. accurate transmission ratio can be obtainedD. low machining accuracy required
题目7单选题
Which pump can't be used as a variable displacement pump ( )A. radial piston pumpB. axial piston pumpC. double acting vane pumpD. single acting vane pump
题目8单选题
Which of the following statements are true? ( ) 1. low viscosity fluids have higher leakage 2. high viscosity fluids have high pressure drop3. low viscosity fluids consume more power4. low viscosity leads to wear of componentsA. 1 and 2B. 1, 2 and 4C. 2, 3 and 4D. 1, 2 and 3
题目9单选题
In a bent-axis piston pump, what happens when the angle between the drive shaft and the cylinder block is varied? ( )A. variable flow rate can be achievedB. piston displacement cannot be variedC. all the aboveD. fixed flow rate can be achieved
题目10单选题
In a hydraulic circuit, the operating sequence needs to be changed frequently, what type of circuit should be adopted? ( )A. Sequential action circuit controlled by sequence valveB. Sequential action circuit controlled by stroke switchC. Sequential action circuit controlled by stroke valveD. Sequential action circuit controlled by pressure relay
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