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A 400-kV transmission line has a hot-weather power rating of1400 MVA. If the transmission line is operating in cold weather, itis rated for 2200 MVA (at 400 kV). The transmission line is undercold weather conditions, and the operating voltage is 390 kV. What is the per-unit value of line-to-line voltage and phase voltage with the operating voltage of 390 kV? What is the per-unit rated cold-weather power if the hot-weather rating is considered to be 1p.u.?
Suppose the suspension system of the average car can be fairly well modeled by an under damped harmonic oscillator with a natural period of 2 seconds. How far apart should speed bumps be placed so that a car traveling at 10 miles per hour
A heat pump maintains a dwelling at 68 F. When operating steadily, the power input to the heat pump is 5 hp, and the heat pump receives energy by heat transfer from 55 F well water at a rate of 500 Btu/min.
The basic column control system shown in Figure is somewhat more complicated than the basic neutralizer control system
Determine the power consumed by the two elements, determine the current leaving the source, determine the power factor and specify leading or lagging. Also, determine the size of the capacitor (in kVARs) needed to bring the power factor to 1
Given an AC input voltage of Vrms = 200Vrms and a sinusoidal frequency of omega = 120pi rad/sec, determine the following: V1peak (peak value of AC input voltage) V1(peak-to-Vpeak )(peak to peak value of AC input voltage) Frequency of input voltage V..
Design a load resistor (resistance rating and power rating) network to have the transformer operate at full load. Design a second network for half load. You may need to combine several resistors to get the desired value.
A new semiconductor has Nc = 1019 /cm3 and Nv=5 x 1018, and Eg = 2eV. If it is doped with 1017 donors (fully ionized), calculate the electron, hole, and intrinsic carrier concentrations at 627K.
A tire is rolling along a road, without slipping, with a velocity v. A piece of tape is attached to the tire. When the tape is opposite the road (at the top of the tire), its velocity with respect to the road is.
give the definition of electrical circuit. draw the simplest electrical circuit and mark the directions of electrical values in it and ohms law. what are the main and the additional elements of the electrical circuit and that are the purpose.
The voltage and current at the terminals of the circuit element are zero for t
desgin an 8-bit 2' complementer using sequentail circuit . you may use one register to store the data to be complemented, one register to store the complemented data, one half adder and one D-flip flop with other gates/registers
A silicon sample is 2.5 mm in length, 1.2 mm in width and 0.7 mm high. It has been doped with Boron with a doping density of 8.5 x 1016 cm-3. Assume the temperature is 300°K.
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