Which of the following control devices is often used in both a primary and a secondary control role?
a. Pressure switches
b. Humidistats
c. Rupture disks
d. Condenser water valves
a
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Communication, PID, safety, and combination are all examples of ____________ modules.
A. output B. input C. specialty D. fixed
A tooling designer is designing a jig that will insert pins into the flip-up handles of a coffeemaker. The bin to hold the pins should hold enough pins for 3 h of work before reloading. The engineering estimate for the rate of inserting the pins is 300/h. The pin diameter is 0.125 in. Because of space constraints, the bin must be designed as shown in Figure 4.17. The bin can be only the width of one pin. What is the minimum height that the bin should be if there is 0.250 in. at the top when it has been filled with the required number of pins?
 FIGURE 1.png)
The three main categories of supplemental lights used in greenhouses include ________, ________, and ________.
Fill in the blank(s) with the appropriate word(s).
In grafting, a "scion" is a newly installed shoot or top of the plant
Indicate whether the statement is true or false