PDH Engineer     PE PDH
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Valves, Valve Actuators, Air Compressors, Hydraulics, Boilers, Cooling Towers, Demineralizers, Pressurizes, Steam Traps and Filters and Strainers


Quiz Questions

1.The body of the valve is sometimes called the shell and is the primary pressure boundary of a valve. It serves as the principal element of a valve assembly because it is the framework that holds everything together.
True
False
2. Narrowing of the fluid passage (venturi effect) is also a common method for ______________ the overall size and cost of a valve.
Reducing
Increasing
3.The basic parts of a valve are represented in ____________________.
Figure 1
Figure 2
4.The internal elements of a valve are collectively referred to as a _____________________.
Valve’s trim
Valve’s bonnet
5.The stem, which connects the actuator and disk, is responsible for positioning the disk. Stems are typically forged and connected to the disk by threaded or welded joints.
True
False
6.A gate valve is a linear motion valve used to start or stop fluid flow; however, it does not regulate or throttle flow.
True
False
7.The _________________________ is the most commonly used disk because of its simplicity and strength. A valve with this type of wedge may be installed in any position and it is suitable for almost all fluids. It is practical for turbulent flow.
Solid Wedge gate valve
Flexible Wedge gate valve
8.A ___________________ is a linear motion valve used to stop, start, and regulate fluid flow.
Ball Valve
Globe Valve
9.The __________________ design is a remedy for the high pressure drop inherent in globe valves.
Y body
Z body
10.A globe valve is generally the least expensive of any valve configuration and has low maintenance costs.
True
False
11.A plug valve is a rotational motion valve used to stop or start fluid flow.
True
False
12.Manual actuators are capable of placing the valve in any position but do not permit automatic operation. The most common type mechanical actuator is the handwheel.
True
False
13.Self-actuated valves use the system fluid to position the valve. Relief valves, safety valves, check valves, and steam traps are all examples of self-actuated valves.
True
False
14.Induced Draft cooling tower is represented in ____________________.
Figure 10
Figure 11
15.A precoat filter eliminates the problem of physically handling radioactive materials, because the filter material (called the medium) can be installed and removed remotely.
True
False