Which of the following is the most important advantage of SSB systems?
A. Reducing the noise present at receiver by half.
B. All information is contained within varying-amplitude sidebands.
C. More effective utilization of the available frequency spectrum.
D. The carrier amplitude and frequency always remain constant.
C
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What type of breeding system results in hybrid vigor?
a. grading up c. outcrossing b. crossbreeding d. inbreeding
A GFI (ground fault interruption) receptacle is ________
A) a special receptacle that has a third terminal for a ground wire B) a receptacle that has a special circuit breaker built into it that can determine if a short circuit occurs and automatically opens to protect the circuit C) a special receptacle for power tools that allows more than one power tool to be plugged into it at the same time
Refer to Figure P2.79 but assume that the cantilevered beam loaded by a force F is made of steel. Strain gauges R1, R2, R3, and R4 are attached to the beam and connected in the circuit shown. The force causes a tension stress on the top of the beam that causes the length (and therefore the resistance) of R1 and R4 to increase and a compression stress on the bottom of the beam that causes the length (and therefore the resistance) of R2 and R3 to decrease. The result is a voltage vBA across nodes B and A.
Determine this voltage if F = 1.3 MN and
Ro = 1k? vS =24V L = 1.7 m
w = 3 mm h = 7 cm Y = 200 GN/m2
Refer to Table 1.5 (in Section 1.3).
a. Using the class intervals in the table, construct a histogram in which the heights of the rectangles are equal to the relative frequencies. b. Compare the histogram in part (a) with the histogram in Figure 1.9, for which the heights are the densities. Are the shapes of the histograms the same? c. Explain why the heights should not be set equal to the relative frequencies in this case. d. Which classes are visually exaggerated by making the heights equal to the relative frequencies?