Explore BrainMass

Electrical Engineering

Systems and simulation - Matlab

Determine and use Matlab to plot y(t) for a 2nd order system with unity dc gain, and poles at -a and -b, where (i) a=b=1, and (ii) a = 1+j1 = b*

LET Z1 = (-1,-1) AND Z2= (1,1)

Let Z1 = (-1,-1) and Z2 = (1,1). Perform the operation Z1Z2. Use number pairs. a. Z1Z2 = (-2,0) b. Z1Z2 = (2,0) c. Z1Z2 = (0,-2) d. Z1Z2 = (0,2)


Let Z1 = (-1,-1) and Z2 = (1,1). Perform the operation Z1 and Z2. Use number pairs. a Z1 + Z2 = (-4,0) b Z1 + Z2 = (0,4) c Z1 + Z2 = (0,0) d Z1 + Z2 = (0,2)

Telecommunications System

A unit for a telecommunications system is to be designed so as to have a minimum availability of 0.9994. The MTTR (mean time to repair) for the unit is estimated to be 24 hours. The unit is to consist of (n) effectively identical elements in parallel, from a reliability point of view. If the hazard rate of each of the elements i

Spring-Mass-Dashpot System Simulation

The attached graphs show simulated compression vs time for a spring-mass-dashpot system described by P(s) = 1/[s^2 + (B/m)s + k/m]. Parameters B, m, and k were each varied in turn with the other two held constant. Identify which parameter was varied in each graph, and whether it was increased or decreased from curve (a) to (d) i

Operational Amplifier

An operational amplifier (Op-Amp) circuit is built to measure the temperature of an exothermic process in a lab. The circuit uses a thermistor (Resistance Temperature Detector) to monitor the target temperature and a voltmeter to measure the output voltage of the Op-Amp ciruit. Since the thermistor is a passive device, it requ

Why can discrete-time FIR digital filters be made exactly linear phase ?

Why can discrete-time FIR digital filters be made exactly linear phase, whereas IIR digital filters cannot? I only require a sentence describing why - not any derivations of formulas etc!!!. I know what makes a filter exactly linear phase (impulse response must be symmetrical), but i don't know why IIR filters cannot be m

Comunication technology

I was wondering if you can please help me with the solution to the following questions. 1a. When a square wave with a fundamental frequency of 2khz and amplitude 5v and comprised of up to five odd harmonic (each successive odd harmonic having half the amplitude of its predecessor) is passed though a standard telephone line o

Systems and Simulation

//\ / Use the Explicit Modified Euler method to calculate x(h) if h = 0.2, x(0) = 1, and x(t) = (-x^2)(t) - 1. The single hat is used to denote the first estimate of a x value and a double hat is used to d

FIR - High pass filter problem - a similar example is included.

This is one of the two DSP problems I posted earlier. I just solved the other one..this one is giving me a lot of grief. There is a similar problem with given solution included to be followed by the problem itselt. I've also noted the differences between the sample and the the actual problem (high pass vs. low pass, cutoff vs.

Node Admittance Equations

For the attached diagram, write, but do not solve, the node admittance equations in matrix form for the network. W = 2 rad. /second. Treat the network as a three-node network.

BJT AC/DC loadline analysis

The problem says to Find Icq, Vceq; plot dc and ac loadlines, calculate the small signal voltage gain, then determine the input and output resistances (Rib and Ro). Beta=120. Va=infinity.

Partial fraction expansion

We have a function (see Attachment). Using a partial fraction expansion of Y(s) find Y(z) when T=0.2 seconds.

Magnetically suspended steel ball

A magnetically suspended steel ball can be described by the linear equation as shown in the attachment. The state variables are x1 = position, and x2 = velocity, and both are measurable. Select a feedback format so that the system is critically damped and the settling time (2% criterion) is 2 seconds. Solve for k1 and k2.

Full Wave Center Tap Bridge Rectifier

In the attached image, how is VDC across the load resistor found? The practice test has an answer of 28.24 ignoring the ripple voltage. VDC across the resister is Vout right? So, Vsecondary - the voltage drop in the diode = Vout = VDC So, if the secondary winding has 40voltage - .7V drop in the top resistor, that's 39.3V

Digital signal processing problem

The problem(2-61) is from the third edition of digital signal processing(proakis+manolakis) 2-61 an audio signal s(t)generated by a loud speaker is reflected at two different walls with reflection coefficients r1 and r2. the signal x(t) recorded by amicrophone close to the loud speaker, after sampling is;

Theoretical and analytical questions

1- Sketch the dc transfer characteristic of the circuit shown below. [VBE(on) = 0.7 V] and also explain the theory behind the working of this circuit. (see diagram in attached file) 2- what is the relationship between gain and bandwidth in amplifiers with negative feedback? How about positive feedback? - what is the adv

Common emitter amplifer

The parameters of the transistor are Beta=100 and Va=100V. Find the DC voltages at the base and emittter terminals. See attachment for circuit.

Transistor design problem

Redesign the circuit showin using Vcc=9V such that the voltage drop across Rc = 1/3VCC and the voltage drop across Re=1/3VCC. Assume Bf=100. the quiescent collector current is to be IcQ=.4mA and the current through R1 and R2 should be approximately .2Icq. Replace each transistor with the closest standard value. What is the v

Bias Stable Transisor Design Problem

Please help with the following problem. The DC load line and Q point of the circuit are shown next to the circuit. For the transistor, Beta=120. Find Re, R1, and R2 such that the circuit is bias stable. Is it valid for me to do a KVL around the C-E loop using ic=4.8ma and vce=6v (ie=ic (b+1/b)) to find RE? And then get