题目内容

Which of the following is a characteristic of servo valve?

A. open loop system
B. closed loop system
C. less contamination
D. all the above

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What is the function of a pressure switch or relay?

A. pressure switch is used to start a motor
B. pressure switch is used to stop a motor
C. pressure switch is used to deenergize a solenoid
D. all the above

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A unloading circuit composed of three-position four-way directional control valve requires that the two chambers of the hydraulic cylinder are blocked when the hydraulic cylinder stops. What type of center function of the directional valve should be selected ? ()

A. “M”
B. “Y”
C. “P”
D. “O”

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What does the numbers in 4/2 valve mean?

A. 4 positions and 2 ways
B. 4 ways and 2 positions
C. none of the above

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Check valve is a type of

A. pressure reducing valve
B. pressure relief valve
C. directional control valve
D. none of the above

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Which of the following is a characteristic of servo valve?

A. open loop system B. closed loop system C. less contamination D. all the above

What is the function of a pressure switch or relay?

A unloading circuit composed of three-position four-way directional control valve requires that the two chambers of the hydraulic cylinder are blocked when the hydraulic cylinder stops. What type of center function of the directional valve should be selected ? ()

What does the numbers in 4/2 valve mean?

Check valve is a type of

A. open loop system
B. closed loop system
C. less contamination
D. all the above