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Many important engineering structures are often coated in a protective paint layer of some kind. This is not simply to improve the appearance of the structure but also to prevent corrosion and damage. There is some interest from industry to be able to track the solidification or drying of the paint layer as it happens to ensure correct thickness and material properties. One way to do this would be to measure the changing values of the permittivity of the paint layer as it dried.
An engineer initially decides to set up an experiment to try this idea out. He decides to use a large metal plate or substrate as one electrode, then paint it and then place another electrode (with a smaller area) directly on top of the paint layer. (The parallel plate equation is still a good approximation using the smallest value for A).1) Describe how a dielectric material responds to an alternating electric field.2) Describe how the permittivity might change with time for a polymer material like the paint as it dries and explain how this measurement could be used to find when the paint was totally dry.3) Describe two flaws with this initial experimental set-up.4) Briefly (half a page max) describe a commercial system of measuring permittivity including all appropriate references.
The wavelength of one particular emission of a certain galaxy has been shifted from 572 to 483 nm due to the Doppler effect. What is the radial speed of the galaxy relative to Earth
A CMOS clocked SR flip-flop uses a technology with unCox = 100 uA/V^2, upCox = 25 uA/V^2, VDD = 2.5V, Vtn = -Vtp = 0.5V and the total capacitance at the output nodes equals 15fF. The inverter threshold voltage VM = 2.5V.
Over a period of 10 seconds, how much charge moves through the element. If electrons carry the charge, which terminal do they enter. How much energy os transferred. Is it delevired to the element or taken from it.
A dc power distribution cable has two #6 copper wires. The copper wire table in the textbook lists each wire as having resistance of Ro=.4028 ohms per thousand feet at temperature of 25C. The temperature coefficient of copper is alpha=.004 per C.
By use of the Nyquist criterion, determine whether the closed-loop systems having the following open-loops transfer functions are stable or not. If not, how many closed-loop poles lie in the right half s-plane.
Voltage regulator utilizes a 500 mW Zener diode with Vz=6.7V at 20mA, rz=lOohm and IzK=5mA. The supply voltage y+ has a nominal value of 12V but can vary by ± 1 V. The load resistor is fixed at 330ohm
AWG 14 solid copper house wire is designed to operate within a temperture range of -40 degree C to +90 degree C. calculate the resistence of 200 circuit feet of wire at both temperatures.
1-phase 2-winding transformer is rated 30 kVA, 360/90 V, 60 Hz. A source connected to the 360-V winding supplies an impedance load connected to the 120-V winding. The load absorbs 15 kVA at 0.8 p.f.
A DC circuit consists of a battery and a coil (not a resistor). The coil has a resistance of R = 5W and an inductance of L = 100mH. At a particular instant in time after a battery is connected across the coil, the current is i = 2.0 A
Design a circuit that takes a sinusoidal input of varying frequency at 1V amplitude and produces an output amplitude of approximately 1V when the frequency is 1 Hz and approximately 0.5V when the frequency is 1,000Hz.
a. if the input r(t)=5u(t), ie. R(s)=5/s, find the steady-state of C(t), b. Approximately how many seconds are required for the system to reach steady state note you two time constants to consider, and c. Do you expect the transient response to be o..
A WLAN uses the 1-Mbps IEEE 802.11 infrared standard and the 16-PPM modulation scheme. Compute the period of transmission (time between bits).
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