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a) A bar-shaped piece of silicon at room temperature is one inch inlength and has a 100 μm2 cross-sectional area (i.e. 10x10μm). It is doped with phosphorous to a concentration of1017/cm3. Find the electrical current through the bar when avoltage of 10 V is applied across the one-inch dimension.b) How long does it take an average electron to drift from one endof the bar to the other?c) Suppose now that we operate in the high-field regime and apply avoltage of 250 kV. What is the electrical current and how long doesit take an average electron to drift from one end of the bar to theother?
If you were the operator for an squirrel cage induction machine, what options could you consider to control speed Describe and mention pluses and minuses of each.
For each of the following waveforms, determine its period, frequncy, and effective value a) 5 V b) 2sin80t-7cos20t+5 V c) 5cos50t+3sin50t V d) 8cos^290t mA
Write a program to find the sum of the elements of an array called list1. The size of list1 is four bytes. The values of list1 are $FF, $1, $FE, and $02. To check your work, the sum should become $0200. The requirements for writing this program ar..
A three-phase, wye-connected, 20-MW load of power factor 0.866 lagging is to be supplied by a transmission line at 138 kV. It is desired that the line losses not exceed 5 percent of the load. If the per-phase resistance of the line is 0.7 Ohm
A 240kW 500V 1750 r/min separately excited dc generator has an overall efiiciency of 94%. The shunt field resistance is 60 ohms and the rated current is 5A. The I^2 R loss in the armature is 0.023 pu.
Each of the capacitance units is built of 4 similar 100V capacitors. Determine the capacitance of each capacitor.
The woofer can be modeled as a series R-L low pass filter. Suppose that a given woofer has an inductance of 750 micron Hertz and a resistance of 4 Ohms. At what frequncy (in Hertz) does its frequncy response
Determine the conductivity of silicon at T = 300 K if it is doped with donor impurity atoms at a concentration of 1.25*1016 cm-3. Assume that the electron and hole mobilities are 1350 cm2 / V-s and 480 cm2 / V-s, respectively.
Consider a discrete time LTI system with impulse response given by h[n] = u[n + 2] - 2u[n - 1] + u[n - 4]. A. Determine the transfer function H(z) for this system. B. Determine the z transform Ys(z) of the step response for this discrete time LTI ..
Nyquist sampling rate condition and aliasing Consider the signal: X(t) = sin(0.5)/0.5t a.)Find the Fourier transform X(Ω) of x(t). b.)Is x(t) band limited. If so, find its maximum frequency Ωmax.
A 115/28 V transformer has 56 turns on its low voltage side. How many turns does it have on its high voltage side what is its turns ratio when it is used as a step-down transformer
Suppose that the machining operation requires 1 kW, that the tool machine ihas 90 percent efficiency, and that the supply current is 14 A rms with a power factor of 0.8. Find the AC machine efficiency.
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