What is the ratio of reflected voltage to incident voltages called?
A. Voltage standing-wave ratio
B. Reflection coefficient
C. Return loss
D. Standing wave
B
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Steep-sloped roofs generally have a slope of ____ or higher.
A. 3:12 B. 4:12 C. 5:12 D. 7:12
In a technical report, the figure numbers and the titles should be placed above the figures.
a. True b. False
In one field trial comparing no-till and conventional tillage, soil samples taken after 15 years without liming revealed that the pH of the upper 15 cm was lower on the no-till plot than on the conventional plot. Which of the following most likely accounts for this difference?
A) earthworms were more active in the no-till plot B) acidifying effects of nitrogen-containing fertilizers C) organic decomposition produced more organic acids in the no-till plot D) plowing mixes the surface soil more thoroughly E) Al3+ ions are tied up by the organic matter thereby releasing H+ ions
An inductor (L) of 2mH is in series with a capacitor (C) of 4.7 ?F across a sine wave ac source. The resonant frequency (fr) of the LC circuit is
A) 519 Hz B) 1,642 Hz C) 3,284 Hz D) 260 Hz