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A recent study has been carried out concerning radio propagation in railway tunnels. In this study, two railway tunnels of rectangular cross section are considered. Tunnel 1 has transverse dimensions of width a = 8 m and height b = 4 m, and tunnel 2 has the same height but a narrower width, a = 6 m. Assuming the tunnels to be empty with perfectly conducting walls, find the total number of propagation modes possible in each tunnel at 100 MHz. Which tunnel allows more modes to propagate?
the hd cable signal send out is usually ranging between (1-25mv), with the frequency range from 1000Hz- 20Khz. An amplifier will gain 46 db will boost the signal before sending it through the cable connection.
Three -phase motor is connected to a three-phase power source that has an abc phase sequence. the first load is a wye-connected, three-phase motor withdrawing a line current of 20A at a 0.8 lagging power factor.
Let the random process X(t) be defined as X(t) = A + Bt, where A and B are independent random variables each uniformly distributed in [-1, 1]. a) Find the mean of X(t). b) Find Rx(t1, t2) c) Is X(t) wide-sense stationary
Calculate the Fermi level position relative to conduction band (Ec-Ef) and relative to valence band (Ef-Ev).
A measurement signal has a frequency less than 1 kHz, but there is unwanted noise at about 1 MHz. Design a low-pass filter that attenuates the noise to 1%. What is the effect on the measurement signal at its maximum of 1 kHz
The residential sector of PA consumed about 150.6x1012 Btu of electricity (www.eia.doe.gov). Assuming all of this energy comes from bituminous coal with a heating value of 14,000 Btu/lb. How MUCH coal did we burn?
Explain briefly why a capacitor can block DC voltage. How might you use this feature in a design. Explain why the impedance Zeq of a parallel RC circuit decreases as the frequency increases.
1- Write a function that shows you how to calculate F(x) = 0.1X^2+5Y^3 2- Read and write a File that has a set of 10 numbers. Then assign those numbers to an array.
1. Derive boundary conditions for electric fields (both for tangential and normal components) 2. Derive boundary conditions for magnetic fields (both for tangential and normal components) 3. Why boundary conditions are so important in electromagnetic..
1. What is the purpose of core in hollow solder wire 2. What is tinning, and why is it important 3. Why is safety so important when soldering 4. Why has lead-free solder replaced lead-based solder. Be sure to properly cite any sources of information.
One side of the transformer bank is connected to a 120-kV transmission line, and the other side is connected to a three-phase load of 10 MVA at 13.2kV and 0.8 lagging power factor. Using the base in the tranmission line of 120-kV and 20 MVA.
Consider a linearly graded Si p-n junction. Find a relation for the potential across the depletion region. Hint: Start from equation 29 in chapter 3 of the text book. Integrate the electric field to find the potential.
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