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G is a material constant equal to 0.055 V-m/N for quartz in compressive stress and 0.22 V-m/N for polyvinyl lidene fluoride in axial stress.
a. A force sensor uses a piezoelectric quartz crystal as the sensing element. The quartz element is 0.25 in thick and has a rectangular cross section of 0.09 in2. The sensing element is compressed and the output voltage measured across the thickness. What is the output of the sensor in volts per new ton?
b. A polyvinyl lidene fluoride film is used as a piezoelectric load sensor. The film is 30 µm thick, 1.5 cm wide, and 2.5 cm in the axial direction. It is stretched by the load in the axial direction, and the output voltage is measured across the thickness. What is the output of the sensor in volts per new ton?
Suppose there is only a single user (i.e., K = 1). From your plot in part (1), do you think the dual transmit antennas provide any gain? Justify your answer. Hint: Use Jensen's inequality.
What are the most common insulators used for extremely high voltages. Explain your answer with, at least, two points foreach insulator. Hint. they can withstand much highertemperatures than rubber insulation.
given a triangular plane in the coordinate plane slanted with a surface bounded by the closed path. how to find the magnetic flux in that plane
A long shunt cumulative compound motor is run at full load. It is rated 240 V, 10 A, 1200 rev/min. If Rf=180 ?, Ra=2 ?, Rs=1.22 ?, and the stray power losses are 160 W, find: a. The back EMF. b. The power rating.
Presuming that oscillations in wavefunction amplitude lead to oscillations at the same frequency in the charge density, and that the charge density at any point in the structure give rise to radiated electromagnetic radiation at the same frequency
Compare the frequency response magnitudes for each of the responses above (will need to plot on a logarithmic scale). Comment on the observations noting things such as if the signals are resolvable, the size of the side lobes, etc.
Design a synchronous circuit that implements a 4-bit decade (modulo-10) counter (0000,0001, ..., 1001, 0000,...) a. Fill in a transition table (using don't cares for undefined next states).
A modulator transmits symbols, each of which has 64 different possible states, 15,000 times per second. Calculate the baud rate and the bit rate.
Suppose that you wish to offer a voice over IP wireless service. The target packet error rate (or drop rate) is 10^3 and you determine that if the signal is confined to within a coherence band, about 20% of the packets are dropped due to fading.
A digital circuit uses two 74LVC2G74 D-FFs operating at VCC =2.5 V. (The PRE and CLR are deactivated.) The D input to one of theFFs is driven by the Q-bar output of the same FF. The D input tothe other FFs is driven by an XOR gate.
The customer forgot to tell you that they need the bias (0V at 00000) to be user-adjustable between 0V and 2V and that the range(5V between 000000 and 111111) must be user adjustable between 3V and 7V.
In an amplifier circuit, why do we need to bias the MOSFET atan operating point What would happen if the signal peak amplitudewas smaller than 1 V, the transistor had Vto=1 V and we biased the transistor at Vgsq=0
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