Water pumps that contain all required starting and protection components and connect directly to the pressure switch with no above-ground controller, are often called ____________________ pumps.
Fill in the blank(s) with the appropriate word(s).
2-wire
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The cad cell relay is a safety device that uses which of the following to prove ignition?
A. Heat in the flue. B. Heat in the combustion chamber. C. Light in the combustion chamber. D. Heat in the blast tube.
Polyester and other synthetic fabrics should not be worn when cutting because _____
a. they break down when exposed to ultraviolet light b. sparks will cause them to melt, inflicting burns to the skin c. they will burst into flames in the presence of pure oxygen d. they will give off toxic fumes if exposed to acetylene
Give two reasons why society went from bio-based products to chemically based products.
What will be an ideal response?
Refer to Exercise 16. Assume that 
= 73.1 ± 0.1°F,
= 37.5 ± 0.2°F, k =0.032 
with negligible uncertainty, and T = 50°F exactly. Estimate t, and find the relative uncertainty in the estimate.
What will be an ideal response?