超星 - Chapter_5_Control Valve

单选题

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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单选题

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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单选题

How is reverse flow possible in pilot operated check valve?

A. spring force lifts the ball due to which reverse flow is possible
B. fluid pressure lifts the ball due to which reverse flow is possible
C. both a and b
D. none of the above

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单选题

A pressure relief valve can be

A. direct operated
B. pilot operated
C. solenoid operated
D. all the above

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单选题

What is the difference between pressure relief valve and pressure reducing valve?

A. pressure reducing valve is connected between pump and tank line while pressure relief valve is connected between DCV and branch circuit
B. pressure relief valve is always normally opened
C. pressure reducing valve is connected between DCV and branch circuit while pressure relief valve is connected between pump and tank
D. none of the above

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单选题

When is a pressure reducing valve used?

A. it is used when higher pressure than system pressure is required
B. it is used when lower pressure than system pressure is required
C. when absolutely zero pressure is required
D. all the above

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单选题

Which of the following statements are true for throttle valve?1. Reverse flow of fluid is not possible2. Input pressure for a throttle valve is more than output pressure3. The actuator speed can be reduced by a throttle valve4. Correct flow control valve for a particular application can be selected on the basis of pressure drop specified

A. 1, 2 and 3
B. 1, 3 and 4
C. 2, 3 and 4
D. all the above

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单选题

What is the function of a flow control valve?

A. flow control valve changes the direction of oil flow
B. flow control valve can adjust the flow rate of hydraulic oil
C. both a and b
D. none of the above

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单选题

What is the function of sequence valve used in hydraulic circuits?

A. sequence valves are used to perform number of operations one after the other after the set pressure is reached
B. sequence valves are used to perform number of operations continuously before the set pressure is reached
C. sequence valves after reaching set pressure oil is flown to the tank
D. all the above

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单选题

Which stage in two stage direction control valve is solenoid operated?

A. main stage direction control valve
B. pilot stage direction control valve
C. both stages in two stage direction control are solenoid operated
D. none of the above

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