Explore BrainMass

Explore BrainMass

    Electrical Engineering

    BrainMass Solutions Available for Instant Download

    PI Controller and Nyquist Analysis

    (Complete problem with equations found in attachment). Problem 1 A very common industrial controller is the proportional and integral (PI) controller. It has a transfer function, , kp is the proportional gain, Ti is the "reset time" For an integrating process, P(s) = 2/s, investigate the positive root locus for

    State space model of a biological conservation system

    A game reserve has two grass fields separated by a crocodile infested river. Buck live on both sides of the river... Conserved Variable = State Variables which are defined... See attached file for full problem description.

    Wireless Network - Prorogation Delay

    The attached 'power point' slide contains information (note most of the information may not be relevant but a few slides contain the relevant formulas) that should assist with solving the problem in the Word document (see attachments). Suppose propagation delay is alpha, Short Interframe Space (SIFS) is alpha, Distributed Int

    Wireless Networks - Encoder Output

    1) The figure attached shows the encoder for a ½ rate convolution code. Determine the encoder output produced by the message sequence 1011. Assume that the initial state of the encoder is zero. See attachment for image.

    Using the Node Equation

    If I were to use the node equation, how do I go about including the dependent sources in the equation. Please view the attachment.

    Solving an Equation with Complex Numbers

    Solve the equation z^2+z+1=0 using z=(x,y) and the basic definitions. (Hint: Note that y does not equal 0 because the equation X^2+X+1 does not equal 0 for any real number x.) a. z1=--1+j(Sqrt3)/2 and z2=-1/2-j(Sqrt3)/2 b. z1=-1/2+j(Sqrt3)/2 and z2=-1/2-j(Sqrt3)/2 c. z1=-1/3+j(Sqrt3)/2 and z2=-j(Sqrt3)/2 d. z1=3/2+j(Sqrt3)

    Solving a Complex Number Equation

    Solve the equation z^2= -1 using z=(x,y) and the basic definitions. a. z=(0,2),(0,-2) b. z=(1,0),(-1,0) c. z=(4,0),(-1,0) d. z=(0,1),(0,-1).

    Speedup and Efficiency

    Question: Given 100 processors for a computation with 5% of the code that cannot be paralleled, compute the speedup and efficiency.

    SEC Code Check Bits

    How many check bits are needed for a SEC code for an initial word size of 1024?

    Saturated NPN Transistor

    A saturated npn transistor has a base to emitter applied voltage of 0.6V. The collector to emitter voltage is 0.2V. The collector current is 12mA. The beta value of the transistor is 30. What is the emitter current?

    RC Series Circuit: Magnitude and Phase Angle

    An RC series circuit has a voltage source of 10Vac, a resistor of 10ohms, and a capacitor with an impedance of -j10ohms. How do I find the magnitude and phase angle of the current flow through the capacitor?

    Digital Signal Processing - Resulting Frequency Response

    (a) Design a lowpass FIR digital filter using "remez" routime in Matlab for the following specifications: filter duration = 15 (order 14), passband = [0.0, 0.4], stopband = [0.6, 1.0], sampling rate = 2.0, magnitude desired = [2.0, 0.0] (passband, stopband), equal weight of deviation. List any noticeable features that you

    Tune PI Parameters

    Question: Given are the facts that Gc and Gp(s) are in series and Gp(s) = (K * Km) / [s[(Ls+R)(Js+b) + K^2m)]]. - K=5; Km=0.5; L=0.001; R=1; J=0.003; b=0.1 Using the trail and error method, tune the PI parameters so they meet these requirements: Steady state error = 0, Settling time <= 0.5s, and Overshot <=20%.

    Solving for Digital Signal Processing

    Question: Consider the signal: x(n)={1,0,-1,2,3} Fourier transform X(w)=Xreal(w)+j(Xi(w)). Determine and represent the signal y(w) that gives the fourier transform of Y(w)=Xi(w)+Xreal(w)e^exp(j2w).

    Interpreting a Step Signal

    Please see the attachment. The image is described by y(t)=t-tu(t-1)-t(u(t-2))+t(u(t-3)). I don't get this. Please point out where the signal turns on and off and why. To me, it looks like a ramp, a step, and then a ramp with neg amplitude. I can do the rest of the problem, i.e. the laplace transform and the other parts

    Design a series controller

    The process of a unity-feedback control system has the transfer function 100 Gp(s) = ------------------------ s^2 + 10 s + 100 Design a series controller (a PD, PI or PID) so that the following performance specifications are satisfied. Steady-state error due to a step i

    Autocorrelation and Tao

    I have a question from my ECE 302 class regarding the mean of a random process given a particular autocorrelation function in terms of tao. I know Variance=(mean-square)-(mean)^2 and I know that the (mean-square)=autocorrelation function with tao set to 0, but I don't know how to get the mean if I don't know the variance of

    Transfer Function Analysis for a Unity Feedback System

    For a unity feedback system with open-loop transfer function, G(s) = K(s+alpha)/(s^2 + 4s + 1): a) Find all values of alpha such that the system is stable for K = 2. b) If the unity feedback closes around this G(s) and an input is a unit step r(t) = 1u(t), what is the stead-state error, e_ss, as a function of alpha and K? c)

    Voltage Divider Principle

    The circuit shown in the attachment was built in the lab and v0 was measured to be 6.25 V. Verify this measurement using the voltage divider principle. My Answer: Vo=320Ohms/(650Ohms+320Ohms+230Ohms)*24V=6.4V

    Thevenin Equivalent Voltage

    A resistor, R, was connected to a circuit box as shown. The voltage, v, was measured. The resistor was changed, and the voltage was measured again. The results are shown in the table. Determine the Thevenin equivalent voltage vt of the circuit within the box. Determine the Thevenin equivalent resistance Rt of the circuit?

    Linear Systems and Equilibrium Point

    Consider the ping pong ball levitator shown in the attachment. Assume that a nozzle makes a cone of air with velocity V_air(h) = u(t) / (h + alpha)^2. u(t) is the opening of an air supply valve, h is the height above the nozzle and alpha is a constant. The drag force on the ball is f_up = c_d * A(v_air - v_ball)^2. "A" is the

    Solving Input Impedance

    See attachment for the diagram. Question: Determine how the input impedance Z (jw) = Vi (jw) / Ii (jw) behaves at extremely high or low frequencies.

    Solving: Fourier Series

    Compute the Fourier series coefficient of the periodic function shown in the figure(view attachment) and defined as: X(t) = A 0 <= t <= T/3 0 T/3 <= t < T

    Current Flow through a Resistor

    Consider the attached circuit. Approximately how much current will flow through the 1K OHM resistor in parallel with the current source?

    Transformer and Load

    In the attached circuit find Ix and Iy. HINT: First find Ix by replacing the transformer and load at point x, x with the transformed load impedance.