Figure 10-1 The letter I in Figure 10-1 means the controller ____.
A. performs an integral function
B. has an indicator
Answer: B
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Valves are held in place by ____________________, which should be installed using the manufacturer’s instructions.
Fill in the blank(s) with the appropriate word(s).
Determine the diameter of a circle in which an arc with a length of 36.90 centimeters has a central angle of 128°18'. Use 
= 3.1416 and round to four significant digits.
Fill in the blank(s) with the appropriate word(s).
Why is low water a dangerous condition for a boiler?
A) A boiler that is low on water can create steam pressure and explode as a result. B) A boiler that is low on water can cause the burners to overheat. C) A boiler that is low on water can cause excessive energy bills. D) A boiler that is low on water will have higher-than-normal internal mineral deposits.
The key used on a calculator to represent division is:
A. ¸ B. + C. * D. #