To aid in roof drainage, joists are built with _____
a. holes to allow for water drainage
b. built-in downspouts
c. a slight slope
d. plastics
c
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Preparing a house for a future solar array is not complicated and can simplify the eventual installation if done properly. Where there is a south or near-south facing roof, it should be designed to have a minimum of ____ square feet of unshaded area with no mechanical penetrations such as plumbing vents, wires, or other obstructions.
A. 100 B. 200 C. 300 D. 400
When observing WSS output with an oscilloscope, most sensors should produce ________
A) An AC sine wave that increases in frequency as wheel speed increases B) An AC sine wave that increases in amplitude as wheel speed increases C) Both A and B are correct D) Neither A nor B is correct
What is the most common form of switching used for mechanical thermostats?
A) spring and bellows B) Magnets C) Mercury bulb D) Warped discs
X-rays are very sensitive and can be used to inspect the _____ of almost any material
a. density b. acoustic impedance c. magnetic flux d. magnetic permeability