LESSON 3
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for each item. When you have completed the exercise, check your answers with the answer key
that follows. If you answer any item incorrectly, study again that part of the lesson which contains the
portion involved.
1.
What are the configurations for relief valves?
___ A. One and two ports.
___ B. One and four ports.
___ C. Two and four ports.
___ D. Two and three ports.
2.
What part of a single hydraulic pump provides more than one level of pressure in a hydraulic
system?
___ A. Return port.
___ B. Pressure reducer.
___ C. Pressure port.
___ D. Compression spring.
3.
How many types of pressure switches are most often used on Army aircraft?
___ A. One.
___ B. Two.
___ C. Three.
___ D. Four.
4.
What device is used to protect against excessive pressure?
___ A. Pressure relief valve.
___ B. Pressure reducer valve.
___ C. Pressure sequence valve.
___ D. Pressure selector valve.
5.
Pressure switches are used to sense--
___ A. excessive pressure.
___ B. electrical current.
___ C. hydraulic pressure.
___ D. electrical voltage.
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