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A 200 volt dc shunt motor delivers an output of 17kW with an input of 20kW. the field winding resistances is 50 ohm and armature resistance is 0.04 ohm. maximum efficiency will be obtained when the total armature copper losses are equal
A certain signal is modeled by a continuous Gaussian random process X(t) with mean E {X(i)} = 2 and autocorrelation function R(t, r) = 4 + e-0.5|r|. Compute the covariance function C(t, r). Compute the variance of X(t). Write the PDF for a single ..
Consider a symmetrical square wave of 20-V peak to peak, 0 average, and 2-ms period applied to a Miller integrator. Find the value of the time constant CR such that the triangular waveform at the output has a 20-V peak to peak amplitude.
determine the coefficients c1, C2, c3, ,c4 used for projecting s onto v(1).v(4),respectively Using v(1), v(2) and v(3) only, find s*, an approximation for s using the orthogonal projection method. Determine the error vector s* - s.
a signal alternates abruptly between -1V and +2V with a duty cycle d. sketch a waveform, and find its full cycle average if d=25%, 50%, 75% for what value of d is the full wave average 0
Express the sequence x(n)={1 n=0 , 2 n=1 , 3 n=2 , 0 else} 1- Express the signal as a sum of weighted and shifted unit impulse sequence. 2- Express the signal as a sum of weighted and shifted unit step sequence
b) What are the equilibrium electron and hole concentrations at 300K and 500K (hint: You will have to find Nc and Nv at 500K, but it isnt necessary for 300K) c) Why does the mobile carrier concentration increase at high temperatures
Set up a Free-Space Optics to transfer data
design a Zener regulator with an output voltage of 7.5 v. the supply voltage can vary between 10 v and 25 v and the load current between 10 mA and 60mA.
Estimate the equilibrium temperature rise and estimate the time constant - write an expression for the estimated curve (theta as a function of time) using the numerical results obtained in parts a and b.
Consider Hall's experiment indicated in Fig. 1. The material is a metal with a density n of charge carriers each with charge q and mass m. The Hall voltage VH is measured for a given applied field B current I and conductor thickness t.
Vgs is the switchcontrol voltage. Find the switch on-resistance Rds and the voltageVds obtained when Vgs=5V and Id=1mA. If μp=0.5μn what must be the PMOS device W/L to provide the same NMOS on-resistance. AssumeVtn=|Vtp|.
Calculate the numerical value of the mutual capacitance of a square parallel plate capacitor whose dimensions are 1 mm X 1 mm if the two plates are separated by a distance of 2 mm. The relative dielectric constant of the material between the two p..
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