____ are plastics that cannot be reheated and reformed once they have been softened, constituted, and cured.
A. Bioplastics
B. Thermosets
C. Thermoplastics
D. Polymers
Answer: B
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Some irrigation systems have stimulated the formation of saline and saline-sodic soils. Which of the following contributes to this process?
A) inadequate drainage systems to remove soluble salts B) low pH of the irrigation water C) high Ca and Mg contents in the irrigation water D) high contents of sulfates and chlorides in the irrigation water E) the low sodium adsorption ratio in the irrigation water
After a TP sensor has been tested using the MIN/MAX function on a DMM, a reading of zero volts is displayed. What does this reading indicate?
A) The TP sensor signal is shorted to 5-volt reference. B) The TP sensor is open at one point during the test. C) The TP sensor is shorted. D) Both B and C are possible.
Homes have various sizes of plumbing vent pipes, exhaust fans, and other components that penetrate the roof decking. In order to prevent water from entering the roof at the openings cut for these penetrations, roofers install ________ or flashing collars
A) H-clips B) Head flashing C) Drip edge D) Pipe boots
In the mono-stable multi-vibrator (one-shot) configuration of the NE555 timer shown in Figure 15.50 in the text, assume R1 = 10 k? and that the output pulse width is T = 10 ms. Determine the capacitance C.
