Practice Exam 01 SOLVED

What is the period and frequency of this signal? Is the frequency constant?What is the bit rate of a given signal?What is the baud rate of a given signal?

Figure 4 shows a PCM signal in which the amplitude levels of +1 Volt and -1 Volt are used to represent binary symbols 1 and 0, respectively. The code word used consists of three bits. Find the sampled version of an analog signal from which this PCM signal is derived. +1 0 -1 MA Tb Figure 4. t

Draw the ho - Load chara dteristics recorded in the table. Valv) n(r.p.m) 24o 25 50 75 100 490 750 1o00 125 1250 150 1200 1760 2010 2000 175 200 205

Also i need the answers to these questions Value of RD1 is a)4.15 kiloohm b)6.53 kiloohm c)2.75 kiloohm d) 8.33kiloohm The value of Rs2 is a)7.52kiloohm b)2.24kiloohm c)4.48 kiloohm d) 5.76 kiloohm The average voltage gain is a)3.54 b)-6.25 c)-3.54 d)-4.62 The output resistance R0 is a)1753ohm b)4480ohm c)153ohm d)450ohm

Q₁: ph paper when required. A-The analog signal s(t) = 10 cos (20 pi*t) cos (200 pi*t) is sampled at the rate of 250 samples per seconds. Determine the following: a- The maximum frequency component present in the analog signal. b-Nyquist rate. B- An analog signal having single frequency as 3 kHz is sampled with 5 kHz signal. Describe its frequency spectrum. What will be the output if the sampled signals are passed through a low-pass filter having cutoff frequency at 2.5 kHz?

Problem 1 The Figure below shows a screen shot of a signal recoded by an oscilloscope. a) What are the average and fundamental frequency for the given signal? b) If the signal is sampled with a sampling frequency of 10 Hz, sketch the sampled signal on the same chart. c) Find the average value of the sampled signal. d) Use zero-order hold to convert the sampled signal to a continuous one and sketch your result on the same chart 2. 0.5 0.4 Time (s) 0.1 0.2 0.3 0.6 0.7 0.8 0.9

For the Given values of 76.3, 72, 81.9, 74.4, 79,Calculate (i) Mean (i)Algebraic Sum of deviation ()Variance (iv)Standard Deviation. i) Mean = ii) Sum of Deviations ii) Variance = iv) Standard Deviation =

Given Figure shows the input characteristic for an n-p-n silicon transistor. When the base emitter voltage is 0.65V, determine the value of base current, the static value of input resistance, and the dynamic value of input resistance. Base current, IB (μA) 500 400 300 200 100 250 μα 0.2 0.4 (a) (b) 99 0.6i 300 ΜΑ 0.06 V 0.8 0.65 V Base-emitter voltage, VBE (V) 1.0

B- Select the best answer from multiple choices 1. A sinusoidal signal has a frequency of 4KHz the best sampling frequency is: a- Equal to 8 KHz. b. More than 8 KHz. c. Both (a) and (b). d. Another value. 2. A signal x(t) with dynamic range +4 volts is sampled and quantised using a 3 bit analogue-to-digital convertor (ADC). The quantisation step size is : a. 2 volts b. 1 volts c. 0.5 volts d.0.2 volts. 3. The shift keying technique with a minimum requirements is : a. ASK b. PSK c. FSK d. None of the above.

minimum bandwidth of 4 kHz. If we digitize the signal and send 8 bits per sample, we need a channel with a minimum bandwidth of 16. What does the sampling theorem tell us concerning the rate of sampling required for an analog signal?

Design counter 0,2,4,6,… with JKFF and DFF

Q1- b) A waveform m(t) = 85 cos( 3600t +5.68 cos( 4500t +) is to be uniformly sampled for digital transmission: i. What is the maximum allowable time interval between sample values that will ensure perfect signal reproduction? ii. If we want to reproduce 50 minutes of this waveform, how many sample values need to be stored?

A solar cell manufacturing company produces pure silicon ingots using the Czochralski process. The ingot's diameter is 15cm and the ingots are cut into 500 um thick (or thin) wafers. After cutting, the cells are put into a diffusion furnace and heated to 850°C. Boron gas is used to dope the silicon wafer to a dopant concentration of 1016/cm³. After letting the sample cooldown to 300K. 1. What is the resistance measured across the 500μm thickness after doping? Use U₂ = 1200 cm² V/s and up = 400 cm² V/s for extrinsic silicon. 2. If 2V were put across the thickness of the doped silicon ingot, how much is the total drift current density?

The spectrum of a signal to be sampled is shown below. What is the approximate minimum sampling frequency needed to avoid aliasing? P(t) Freq, kHz 1 3. 4 10

Find Vgs (network eq) and Id (device eq).

Q1. Choose only seven for the following: 1) ..... .....................of measurement is difference between measured values and true values. expressed in units of the measured quantity. a. percent error 2) b.relative error c.absolute error ********** .........closeness with which an instrument reading approaches the true value of the variable being measured. a. resolution b.sensitivity 3) c.accuracy ********** a. Working Standards are the basic reference standards used in industrial measurement laboratories The resolution for instrument is .......... When the readings of the instrument in volts were b.Secondary Standards e.International Standards XI-1.1, X2-1.2, X3-5, X4-5.2 a.IV b.0.1V c.0.2V 5) The percent error..............when the voltmeter measures the voltage-1.41 V. and the true value of voltage=1.44 V. a. 0.208%. b. 20.8%. c. 2.08% 6) ******* are divided into two categories, instrumental error and environmental error. a. Systematic errors b. Gross errors c.Random errors 7) The…

Assume a signal is represented by the following expression,    Calculate:   a)The signal bandwidth in KHz. Show all calculation steps. b)The period of the fundamental frequency in micro sec. Show all calculation steps.

1. In MS tams project meeting the student audio voce is captured and sampled for 10 second by an 12-bit ADC at a sampling frequency of 30 kHz. The samples are stored on a memory chip.i. What is the minimum memory size in bytes required to store all the samples?ii. How long the signal must be sampled to store the samples in 1 GB Pen drive iii. What should be the highest frequency component of the signal?iv. If the sampling frequency is increased by 50% then how long the signal must be sampled to store samples in 1 GB Pen drive

In MS tams meeting teacher audio voce is captured and sampled for 20 second by an16-bit ADC at a sampling frequency of 50 kHz. The samples are stored on a memorychip. i. What is the minimum memory size in bytes required to store all the samples?ii. How long the signal must be sampled to store the samples in 1 GB Pen driveiii. What should be the highest frequency component of the signal?iv. If the sampling frequency is reduced by 50% then how long the signal must besampled to store samples in 1 GB Pen drive   3. Discuss the significance of DFT in signal processing applications

In MS tams meeting teacher audio voce is captured and sampled for 20 second by an16-bit ADC at a sampling frequency of 50 kHz. The samples are stored on a memorychip.i. What is the minimum memory size in bytes required to store all the samples?ii. How long the signal must be sampled to store the samples in 1 GB Pen driveiii. What should be the highest frequency component of the signal?iv. If the sampling frequency is reduced by 50% then how long the signal must besampled to store samples in 1 GB Pen drive

Question related circuit analysis

For signal x[n] shown in the figure below.

A movie was shot in 150 fps. The movie lasted for 30mins. The movie was played in a vertical and horizontal pixel of 720 x 720 respectively. The bit depth for the video was 16 bit. This same video was shot having an audio sampling rate of 44100 Mhz with an audio bit depth of 32bit. The producer of the video decided to test the quality of the audio for the movie with a surround 5.1 channel audio system. 15 marks i) Calculate the audio file size in bits and explain its effect on the video file. ii) Calculate the file size of the video in Megabytes (Mb) iii) Calculate the bit rate of the video file and explain the effect of the value on processing of the file

H.w Q1) Five measurements of the voltage of resistor gave: 50.2V, 50.1V, 50V, 50.2V and 50V. assume that only random errors are present. Calculate: a) The standard deviation of the reading. b) Probable error of the reading. c) Variance of the reading.

Q4/ Why the performance of multimode graded index is better than multimode step index? Q5/ Design fiber optics communication system with analogue input and then measure the performance of the three types of fiber optics configurations. After that, answer the following questions: 1. Which configuration is the better? Comment! 2. Which parameters that improve the performance of multimode step index? Comment! 3. Which parameters that improve the performance of multimode graded index? Comment! 4. Which parameters that improve the performance of single mode step index? Comment! 5. If we need to increase the fiber length from 1 km to 15 km. which configuration is used? Comment!

A. Given an 8 bit ADC, find its resolution (step size) for producing a digital signal for an analog input ranging 260 - 516 V. Draw the first and last 3 steps of a table with 3 columns showing the analog input-digital output numeric relationship. B. The frequency of an analog signal is 23 MHz. What is the minimum sampling frequency for representing it in digital form, according to the Nyquist theorem? Explain with the help of a diagram what happens if Nyquist theorem is not obeyed.

2. In MS tams meeting teacher audio voce is captured and sampled for 20 second by an 16-bit ADC at a sampling frequency of 50 kHz. The samples are stored on a memory chip. i. What is the minimum memory size in bytes required to store all the samples? ii. How long the signal must be sampled to store the samples in 1 GB Pen drive  iii. What should be the highest frequency component of the signal? iv. If the sampling frequency is reduced by 50% then how long the signal must be sampled to store samples in 1 GB Pen drive 3. Discuss the significance of DFT in signal processing applications.