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Instrument Mechanic Practice Test: Final Control Elements
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Instrument Mechanic Practice Test: Final Control Elements
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25 Questions

1. Which of the following valves are used in high duty cycle applications?
2. The gate valves are made of ___________ with brass mountings.
3. What is the purpose of Pinch valve?
4. What is a pressure sequence valve?
5. Actuator converts
6. Which type of valve is preferred for vacuum applications?
7. ___________ valves are used to discharge air from the water pipelines.
8. Of the below mentioned valves which of the following are used to control the flow of liquid in a single direction?
9. A 5/2 Way single solenoid valve has;
10. Which valve allows water to flow in one direction only.
11. Which valve is used when a straight line of fluid and minimum restriction is required ?
12. Regardless of type, all valves have the following basic parts , with the exception of
13. Which of the following valve is known as safety valve?
14. Which of these are usually not preferred for frequent operation?
15. Which of the following valves is better for on/off control?
16. A ____________ restricts air flow.
17. The purpose of a valve packing to :
18. When the piston area of the cylinder is connected to the atmosphere the piston os the single acting cylinder is pressed by the spring to the
19. Which of the following is known as shut off valve?
20. The gland of a plug valve is equivalent to the ___________ of a gate or globe valve.
21. What is the purpose of piston valve?
22. Most valves use ____________to prevent leakage from the space between the stem and the bonnet.
23. Which one of the valve parts is not usually considered to be a part of the pressure boundary?
24. Cavitation in a control valve is caused by :
25. The ______ is the most commonly used disk within a gate valve , because of its simplicity and strength.

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