Explore BrainMass

Explore BrainMass

    Electrical Engineering

    BrainMass Solutions Available for Instant Download

    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.

    Ideal voltage sources

    I am attaching a scanned image of a circuit problem, please answer and show the method used in determining the answer.

    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

    See the attached file. 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 heigh

    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

    Steady State Conditions

    Just before the switch is opened at t=0, the current through the inductor is 1.70 mA in the direction shown in figure (PLEASE SEE ATTACHMENT). Did steady-state conditions exist just before the switch was opened? L = 0.9 mH; R1 = 6k Ohm; R2 = 6k Ohm; R3 = 3k Ohm; Vs = 12V

    Simulink - Modelling

    Consider the following model of a cell growth in a bio-system. The state differential equation is... a) Identify the state variable, the inputs, outputs and parameters. (See attachment for full question)

    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

    Internal Resistance of a Battery

    The circuit is used to measure the internal impedance of a battery. The battery being tested as a NiMH battery cell. A fresh battery is being tested, and it is found that the voltage Vout, is 2.28 V with the switch open and 2.27 V with the switch closed. Find the internal resistance of the battery. See attached file f

    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?

    Calculate the Per-Unit Current and Load Current in Amperes

    Three zones of a single-phase circuit are identified in figure 3.10(a) {see the attachment}. The zones are connected by two transformers, T1 and T1, whose ratings are also shown in the same figure. Using the base values 20 kVa and 115 volts in zone-3, calculate the per-unit current and load current in amperes. Neglect the transf

    Calculate the Per-Unit Source Voltages

    Three zones of a single-phase circuit are identified in the attached figure 3.10(a) {see attachment}. The zones are connected by two transformers, T1 and T1, whose ratings are also shown in the same figure. Using the base values 20 kVa and 115 volts in zone 3, calculate the per-unit source voltage. Neglect the transformer windi

    Calculating Line Voltage at the Load

    Two balanced, in parallel connected, three-phase loads are fed by a three-phase line with an impedance of (2+j4) Ohm per phase. Calculate the line voltage at the load, given the phase voltage and per-phase current. Please see the attached file for the four possible options and the adequate notation of the formulas.

    Three-Phase Overhead Transmission Line

    A three-phase overhead transmission line has a per-phase resistance of 0.15 ohm/km, and a per-phase inductance of 1.3263 mH/km. Assume that the shunt capacitance is negligible. The length of the line is 40 kilometers and it operates under 220 kV and 60-Hz. The line is supplying a three-phase load of 381 MVA at 0.8 power factor l

    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)

    Root Locus and Root Locus Design

    Please help me with the attached root locus design question (see attachment). (Involves: plotting the root locus, determining gain, designing a proportional and integral controller, determining the location of the controller zero, and finding the required controller gain).

    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