What are mixing valves used for?
What will be an ideal response?
Mixing valves are used to mix the hot boiler water with the cooler return water.
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Define surveying.
What will be an ideal response?
The best way of saving energy when using any welding equipment is to____.
A. help coworkers do their job after finishing your own B. prevent contaminants from forming and collecting in the area C. lower the skin temperature D. turn off the machines when they are not being used
Which of the following statements is NOT true?
A) If a mechanically operated industrial switch is used the trigger point can not be changed. B) Mechanically operated industrial switches are changed by a process parameter. C) Mechanically operated industrial switches are automatically opened or closed when a predetermined process set point is reached. D) All of the above are true.
Positive feedback cancels some of the command signal.
Answer the following statement true (T) or false (F)