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Electrical Engineering

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?

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

8 x 8 JPEG Image

Consider the following 8x8 8-bits image: 26 25 30 30 37 37 37 37 7 28 29 30 37 37 37 37 6 9 31 28 37 37 37 37 4 5 10 30 37 37 37 37 9 9 9

Phasor Current

Hi, I need some assistance for the following question: Question: For the following circuit, find the phasor current. Please see attachment for circuit diagram.

System Modelling (Output: Density)

Two tanks are arranged as shown in the attachment. Salt and water are added into the first tank at rates {see attachment}. The tanks are well mixed and the salt dissolves completely. The flow between the two tanks depends on the pressure difference {see attachment}. The flow out of te second tank is given by {see attachment}. Bo

System Modelling - Output and State Differential Equation

Consider the ice-cream manufacture process shown in the attachment. The ice-cream is made up of the following ingredients: i) Liquid (cream, milk, water etc.) added at a rate r1 [kg/hr] and with a density p1 [kg/1]. ... {see attachment for more details} (a) Find a model for the process with height in the tank and density

Determining the Voltage for Capacitor

Please see the attached file for diagram. Question: Determine Vc(t) for t>0. The voltage across the capacitor in figure just before the switch is changed is given below: Vc(0) = -7V Io = 12mA C = 0.55muF R1 = 7kOhms R2 = 3.3 kOhms

Simulink - Modelling - Linear Systems

1. A system with input u(t) has the following model ... (see attachment) Find the linearized state space model about the steady state with ... (see attachment) 2. Draw the simulink implementation diagram required to simulate the non-linear system and its linearized version from question 1. The input signal will come from the

Numerical Integration and the Runge Kutta Method

a) For a fixed delta t(i+1)= delta t, the linear equation, x = Ax, x(t0)=x0 has the solution... Show that the Runge Kutta method (below) is 3rd order and not 4th order for the above linear equation. bi) Find the exact solution of x = -2x, x0 = 3 bii) Find the numerical solution for two simulation steps using explicit Euler a

Solving for Thevenin Equivalent Resistance

Question: Find the Thevenin equivalent resistance seen by resistor R3 in the circuit. Compute the Thevenin (open-circuit) voltage and the Norton (short-circuit) current when R3 is the load. VS1=VS2= 450V. Please see diagram in the attached file.

Superposition of current

Using superposition, determine the component of the current through R3 that is due to VS2. VS1 = VS2 = 450V. (see diagram in attached file)

Finding a transfer function

The frequency response of a linear time invariant system has been measured and can be seen in the attachment file below. A feedback element with a transfer function, H(s), is to be chosen so that the system steady-state error to a unit step input is equal to 0.07. What is a suitable transfer function to achieve this? I am ha

Resistance of Headlights

A 24-volt automotive battery is connected to two headlights, such that the two loads are in parallel; each of the headlights is intended to be a 75-W load, however, a 100-W headlight is mistakenly installed. What is the resistance of each headlight, and total reistance seen by the battery?

Current for Three-Phase Loads

Two balanced, in parallel connected, three phase loads are fed by a three phase line with a certain impedance per phase. Parameters are given for each load, with the line energized at the sending end from a 60Hz, three-phase balanced voltage source with line to line voltage of 120*((3)^(1/2))*(V) rms. Given the phase voltage (

Network Planning, Link Budget, and Hata Model

A Potential client has asked you to predict the number of cells necessary to cover 100 square miles. The area the client wished to cover compromises 5 sq miles Urban, 25 sq miles, Suburban and the remainder rural. For urban areas the client can acquire 30 m towers, for Suburban 60 m and for rural 100 m Assume feeder lengths =

Communications Systems of Frequency Downconverters

A frequency downconverter is implemented using a square-law device as follows. The band-pass filter has a center frequency fi=|fc - ft| (also known as the intermediate frequency, IF). Assume that the message bandwidth of the input signal m(t) is equal to B Hz. a) Determine the smallest possible IF frequency, so that there

Wireless Communication

1. For an urban environment, at 1900MHz, what is the path loss between a base station at 40m height and a mobile at 1.6m height separated by a distance of 5 km? 2. TDMA has 416 frequencies in one of the cellular license bands. If a cellular operator designs a network with a 5/15 reuse pattern, how many frequencies per cell

Wireless Communication Systems

1. Assume a CDMA system has only 4 walsh codes. If the mobile is assigned W4 and receives a data stream of 11011010, what is the output? 2. What is the c/I for a network using a 7/21 reuse pattern? (consider only the closest 6 interferers and a propagation exponent of 3.5)

C++ Program - Min/Max Number

I started writing a program and need help. I need to be able to enter up to 15 numbers and output the minimum number, maximum number and the geometric mean. I have a program started, is there a way to shorten it? And I don't understand the geometric mean. Thank you for your help.

C++ Program Help

I am trying to make a program that will read a file from a disk and will take the first letter of each word and and make that into a sentence. Example: Can Always Talk == CAT I can get into the file, just can't make it work.

Fault Currents and Three Phase Faults

Please see the attached diagram for the specific parameters in finding the real, sub-transient fault current for a line to ground fault. The same process should be repeated in finding the three phase fault at the same point.

Programming Logic for Movie Collection

You want to produce a report of your movie collection. Which fields would you use, and which would be the data types of each of those fields? Create a flowchart and pseudo-code for generating a report that prints all of the movies, with all movies made by the same director on one page, as well as the number of movies by each

DSP

[A] The frequency response of a 2nd order LTI filter is H(e^jw)=(b0+b1e^-jw+b2*e^-2jw)/(1-a1*e^-jw-a2*e^-2jw) Assume b1=b2=0. In each case state whether the filter is highpass, lowpass or band pass and draw the pole/zero plot. i) a1=-1.8, a2=-.81 ii) a1=-1.27, a2=-.81 iii) a1=0,a2=-.81 iv) a1=1.27,a2=-.81 Explain th

First Order Controller Design

Given P = [(3e)^-10.03s] / [s/4 + 1], use the Inverse Nichols Chart to design a simple G(s) to achieve the following specifications. i) Zero steady state error to a step output disturbance. ii) |1/(1 + L)| <= -15dB, w <= 1 rad/s. iii) [1/(1 + L)| <= 3dB, Aw

Wireless Communication and Walsh Code Matrix

(a) Graph the theoretical number of users of a CDMA system with a data rate of 9.6 kbs and 14.4 kbs while varying the Voice activity factors from 10% - 100% (b) Create the Walsh code matrix for a W16. (c) For IS-95, on the forward link, list the Walsh code assigned to the various logical channels (hint: there are 64 Walsh code