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# Electrical Engineering

### C program: counting numbers between 0-9

Write a C program that generates one hundred random integers between 0 and 9 and displays the count for each number. Make use of rand() to generate a random integer between 0 and 9. Use an array of ten integers to store the counts for the number of 0's, 1's, ... , 9's.

### BJT voltage noise

Please see the attachment for circuit diagram, where R1 = 91k ohms R2 = 20k ohms Re = 1k ohms Rc = 5k ohms. Connect two identical amplifier stages like the one above in cascade (one after the another). What are the voltage gain and input and output impedances of the combination? Assume that the circuit is driven from a

### Spectrum Analyzer: Signal waveform, Pulse width

A spectrum analyzer is connected to an unknown signal. The spectrum analyzer displays the power level of signals in dBm vertically and frequency horizontally. The spectrum of the unknown signal creates the following display: A continuous spectrum that is completely filled so no lines are visible. The spectrum has a sin X

### Invesitagtion of Intermodulation through an amplifier

An amplifier is designed to handle frequencies around 9 GHz. The bandwidth of the amplifier is 2 GHz with a center frequency of 9 GHz. Two signals are input to the amplifier. It is observed with a spectrum analyzer that many spurious responses exist. Two spurs are measured at 9.9 GHz and 8.1 GHz. If these responses are due to ni

### Suppose two pure sinusoid tones are input to an amplifier.

Suppose two tones are input to an amplifier. The tones are pure sinusoids with one at frequency 5 GHz and the other at frequency 5.02 GHz. Assume that the transfer characteristic of the amplifier is represented by Vout (please refer to the attachment for details). List the output frequencies of all 3rd order (those near 15 GH

### BJT Circuit and Maximum Range of Collector Voltage

1. Choose values of R1, R2, Rc and Re to give 1 volt at the emitter and 5 volts at the collector for a typical beta transistor with 1 mA collector current at room temperature, and state them. What is the collector voltage with your values for a minimum typical device, a maximum current gain device, and at 100 °C for a typical d

### Compute the sampling frequency, and the bit rate of the transmission on the twisted pair.

The output of a video surveillance camera is an analog signal with a bandwidth that extends from 0 Hz to 1.5 MHz. The signal is sampled at 1.2 times its Nyquist rate. The resulting PAM signal is converted to 6 bit digital words with an analog to digital converter and the words are transmitted serially over a twisted pair use

### Transform functions used in the circuit's transform block

Match the transform functions used in the circuit's transform block (LAP1) to produce the four given wave forms. Provide as much supporting notes as possible. Please see attachment for further details.

### Understanding low, high and band pass filters

1. A signal in the IF section of an FM radio receiver occupies the frequency band 10.61 MHz to 10.79 MHz. Compute the bandwidth of this signal. 2. A signal in the IF section of an FM radio receiver occupies the frequency band 10.61 MHz to 10.79 MHz. There is another FM signal occupying the frequency range 11.01 MHz to 11.19 M

### Fourier Series for Sawtooth Waveform

Please show as much working as possible and comment where possible. Obtain a Fourier series for the sawtooth waveform in attachment. Please base your answer on the integrals mentioned in the attachment. See the attached file.

### Fourier Series: Even and Odd Functions

Please show as much working as possible and comment where possible. Compare the values of f(x) and f(-x) to show which of the following are odd, even or neither. Give a reason for each. Please see the attachment for complete question.

### Determine the required ratio of (delta-T / T) to give the waveform a r.m.s value of 4 volts.

Determine the required ratio of (delta-T / T) to give the waveform a r.m.s value of 4 volts. Please see the attached image for more detail. Please show as much working as possible and comment where possible.

### Insertion Loss of T-Network

Given the transmission matrix, calculate the insertion loss of the T-network. Please refer to the attachment for the matrix and the network diagram. I have provided the formula I am working from but I normally prefer a completely different set of workings to provide a good base for comparison/improvement to my own methods.

### Determine the secondary coefficients of given transmission line at a frequency of 1 GHz.

Please see the attachment for complete questions. Please show as much working as possible and comment where possible. 1. Determine the value of Z0 for the symmetrical PI-circuit shown below. 2. A transmission line has the primary coefficients as given in the table below. Determine the line's secondary coefficients at a fr

### Phase change down the transmission line and the input impedance to the line

Please show as much working as possible and comment where possible. (a) A transmission line has a length, l, of 0.4 lambda. Determine the phase change that occurs down the line. (b) A 50 Ohm lossless transmission line of length 0.4 lambda is terminated in a load of (40 + 30j) Ohm. Determine, using the equation given below

### Two-Port Network, Z-Parameter Matrix

Please see the attachment for mentioned network and circuit diagrams. 1. Find the z-parameters of the two-port network below. 2. In the circuit below, the two-port network TPN can be represented by the z-parameters shown. a. Represent the complete circuit by a z-parameter matrix. b. State if the complete circuit is rec

### Mesh currents

Please see attachment for questions with mentioned figures. Please show good process of solving mesh current in circuits. Consider the circuit shown in Figure P1-14. Find the unknown currents I1, I2 and the voltage across the resistance R. Refer to the circuit shown in Figure P2-14. What are the currents I2 and I3?

### Determine the supply voltage and current in the given ideal autotransformer.

Please show as much working as possible and comment where possible. The figure in the attachment shows an ideal autotransformer (k = 1 and no power losses) with a 10 ohm load carrying 100 A. Determine the supply voltage and current if L1 = 4L2.

### Multisim, Mod-100 BCD counter, Octal-to-binary switch encoder, 16-channel 1-bit multiplexer, AHDL, Comparator

1. Using Multisim, design a mod-100 BCD counter that drives a 2-digit, 7-segment display. The count sequence will be 0 through 99. Blank leading zeros in the tens digit of the display. 2. Design an octal-to-binary switch encoder and 7-segment display circuit using a 74148 priority encoder, a 7447 decoder/driver chip, and any

### Delta to Wye Conversion

Please show as much working as possible and comment where possible. By applying a star-to-delta conversion on Z3, Z4 and Z5, determine the input impedance, Z_IN, to the circuit. Use the impedance values given in the table. Please see the attachment for complete question.

### Design a Variable Frequency Divider, and a Mod-31 LFSR Counter using AHDL.

Activity 3: (Problem 14A.6) Design a variable frequency divider using AHDL. The frequency divider should divide the input frequency by one of four different factors. The divide-by-factor is controlled by two mode controls, as described by the following function table. The mode controls are used to change the modulus of the

### Digital Communications

Order the following modulation types in terms of spectral efficiency (best to worse) and explain why (be specific, show a number and how you got it): 64-QAM, QPSK, 8-PSK, and BPSK. Assume that the r=0, perfect filtering.

### Outgoing traffic intensity and the number of channels.

A telephone switching board can handle 120 phones. Assuming the following, and determine the outgoing traffic intensity and the number of channels. * On average 5 calls/hour per phone * 60% of all calls made are external * Average call duration time is 4 minutes * GoS = 0.9%

### An LVDT is used in an accelerometer to measure seismic-mass displacement. Find the relation between acceleration and output voltage.

An LVDT is used in an accelerometer to measure seismic-mass displacement. The LVDT and signal-conditioning output is 0.31mV/mm with +/-2cm maximum core displacement. The spring constant is 240N/m, and the core mass is 0.05kg. #1. Find the relation between acceleration in m/s^2 and output voltage. #2. Find the maximum

### Erlang B chart find the traffic intensity

A single GSM service provider supports 10 digital speech channels. Assume the probability of blocking is 1.0%. From the Erlang B chart find the traffic intensity and determine how many 3 minute calls this represents: a) 20 calls b) 100 calls c) 50 calls d) 240 calls

### Bandwidth and half-power frequencies of the tuned circuit, Impedance offered to the supply and magnitude of the voltage Vo at resonance

Please show as much working as possible and comment where possible. The diagram in the attachment is a tuned circuit with Q-factor of 1000 and is designed to resonate at 1 MHz. At resonance the supply current (I) is measured as 16 muAmp for a supply voltage (Vs) of 2.5 V. The load resistor Rl is 10 kOhm. a) Calculate the

### Cantilever and Strain Gauge

Please refer to the attached pdf file for complete question with mentioned figures and tables. 1. The cantilever and strain gauge act as the transducer in a force-measuring instrumentation system as shown in FIGURE 2. An applied force FT (the true force) is the input to the system and the output is FM (the measured force). Id

### Laplace Transform, Inverse Laplace Transform, Total response of the current

Please show step-by-step how to solve the problems in the attached file. The problems include - Finding the Laplace Transform and Inverse Laplace Transform. - Determining whether a system with the given voltage and current in the Laplace domain is resistive, capacitive, or inductive. - Determining whether a given system is da

### Modern Communications

1. Explain in your own words why standards are so important. 2. List 3 standards used in IT and briefly describe them and what they regulate. 3. Describe in you own words how a modem works and what steps the data goes through to be sent from one terminal to another via modem. 4. What can affect /deter modem communicatio

### Electrical signal feedback, Public Address system, Howling

Please answer the following questions. (a) It is found that if a microphone is brought into the proximity of a loudspeaker on a public address (P.A.) system, the system will `howl'. Carefully explain, making reference to feedback theory, why this is so. (b) Suggest two actions that could be adopted to remedy the howling. (c