Which of the following pressure control valves has a direct outlet to the tank ( )
A. Sequence valve
B. pressure reducing valve
C. pressure relief valve
D. pressure relay
查看答案
In the hydraulic system, the valve used to regulate the flow of liquid into the actuator is ( )
A. relief valve
B. check valve
C. speed regulating valve
D. directinonal control valve
The pressure loss at the pressure reducing valve in the hydraulic system belongs to
A. pressure loss along the way
B. local pressure loss
C. both
D. neither
How is strong magnetic field in a solenoid achieved ?
A. strong magnetic field in a solenoid is achieved, if coil acts as conductor
B. coil is surrounded by a iron frame
C. iron core is placed at the centre of the coil
D. all the above
What is the DC range of of solenoids in pneumatic systems?
A. 12 V and 24 V
B. 110 V and 220 V
C. both a and b
D. none of the above
微信支付 
支付宝支付