# Viva questions on low pass and high pass filter pdf

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Explain what is a dc power supply? The part of the equipment that converts ac into dc is called dc power supply. Explain what is a rectifier?

## Active High Pass Filter

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Y Prepared by J. Implementation of FFT of given sequence. Determination of power spectrum of a given signal. Generation of sinusoidal signal through filtering. Generation of DTMF signals. Implementation of Decimation process. Implementation of Interpolation process. Extraction of periodic signal masked by noise using correlation.

Verification of winer-khinchine relations. Checking a random process for stationary in wide sense. Students are required to attend all labs. Students will work individually in hardware laboratories and in computer laboratories. While coming to the lab bring the lab manual cum observation book, record etc.

Take only the lab manual, calculator if needed and a pen or pencil to the work area. Before coming to the lab, prepare the pre-lab questions. Read through the lab experiment to familiarize yourself with the components and assembly sequence. Utilize 3 hours time properly to perform the experiment both in software and hardware and note down the readings properly.

Do the calculations, draw the graph and take signature from the instructor. If the experiment is not completed in the prescribed time, the pending work has to be done in the leisure hour or extended hours.

You have to submit the completed record book according to the deadlines set up by your instructor. For practical subjects there shall be a continuous evaluation during the semester for 25 sessional marks and 50 end examination marks.

Of the 25 marks for internal, 15 marks shall be awarded for day-to-day work and 10 marks to be awarded by conducting an internal laboratory test. Windows XP SP2. However, the area of the impulse is finite. This is, at first hard to visualize but we can do so by using the graphs shown below. The unit step function, also known as the Heaviside function, is defined as such: 7. For many applications, it is irrelevant what the value at zero is.

The derivative of a unit step function is called an impulse function. The impulse function will be described in more detail next. Integral The integral of a unit step function is computed as such: 8. It occurs often in pure mathematics, as well as physics, signal processing, electrical engineering and many other fields.

Write program to get Discrete time Sinusoidal Signal? Write program to get Fourier Transform of Sinusoidal Signal? Write a matlab program for generating u n -u n-1?

Write program to get Discrete time co-Sinusoidal Signal? Write program to get Discrete time saw tooth Signal? Write program to get Discrete time triangular Signal? Write program to get addition of two sinusoidal sequences? Write program to get exponential sequence?

Define Signal? Define determistic and Random Signal? Define Delta Function? What is Signal Modeling? Define Periodic and a periodic Signal? N F k are often called the 'Fourier Coefficients' or 'Harmonics'. The DFT is the most important discrete transform, used to perform Fourier analysis in many practical applications. In image processing, the samples can be the values of pixels along a row or column of a raster image. The DFT is also used to efficiently solve partial differential equations, and to perform other operations such as convolutions or multiplying large integers.

Write a matlab program to find the circular convolution of two sequences? Write a matlab program to find the to compare circular and linear convolution of two sequences? Define Symmetric and Anti-Symmetric Signals? Define Continuous and Discrete Time Signals?

What are the Different types of representation of discrete time signals? What are the Different types of Operation performed on signals? Define DFT. How DFT can be calculated in matrix form?

THEORY:- Second order systems are the systems or networks which contain two or more storage elements and have describing equations that are second order differential equations. The frequency response of second order filters is characterised by three filter parameters: the gain k, the corner frequency and the quality factor Q. What is the commend to find phase angle?

What is the commend to find frequency response? What is transition band? What is the formula for Z-transform? Fourier analysis converts time or space to frequency and vice versa; an FFT rapidly computes such transformations by factorizing the DFT matrix into a product of sparse mostly zero factors. Write a matlab program to find the cross correlation using FFT? Whether linear convolution equation is a difference equation? Whether DFT is a linear transform? Can you implement linear convolution using circular convolution?

How FFT algorithms are classified? THEORY:- The power spectrum of a time-series x t describes how the variance of the data x t is distributed over the frequency components into which x t may be decomposed. Write a matlab program for power spectrum estimate using Welch method?

Write a matlab program to plot the frequency response of a first order system? Write a matlab program to plot the frequency response of the system?

## Difference between High Pass and Low Pass Filter

There was an era where while making a telephone call over distance places, one had to put his mouth very close to the transmitter, speak very slowly and very loudly so that message can be heard clearly by the person at the other end. Today, we can even make video calls over worldwide with high-quality resolutions. The secret of such a tremendous development of technology lies in Electrical filter theory and Transmission line theory. Electrical filters are circuits that pass only selected band of frequencies while attenuating other unwanted frequencies. One of such filters is High pass filter. The value of cutoff frequency depends on the design of the filter.

Ans: It is an electronic circuit a bistable multivibrator that has two stable states and thereby is capable of serving as one bit of memory. What is a multivibrator? Ans: A multivibrator is an electronic circuit used to implement a variety of sample two state systems such as oscillators, timers and flip-flops. It is characterized by two amplifying devices transistors, electron tubes or other devices cross coupled by resistors and capacitors. The most common form is the stable or oscillating type, which generates a square wave- the high level of harmonics in its output is what gives the multivibrator its common name. What is the purpose of multivibrator? Ans: The multivibrator is one form of relaxation oscillator, the frequency of which may be controlled by external synchronizing pulses.

ELECTRICAL WAVE FILTERS Questions and Answers pdf free download for electronics engineering students,mcqs,objective type questions viva lab manuals. used filters are low-pass, high-pass band-pass, band-reject and all-pass filters.

## Passive Filter Circuits

A filter is often used in electronic circuits to block or allow a select frequency to the circuit. For example, if the circuit in question works on DC power, we could use a low pass filter LPF and only allow low frequencies to pass through. The filter is designed around a cut off frequency, and only allows the low frequencies to pass through. Now, while designing we can set the cut off frequency as required. The same can be done for high pass, band pass and band stop filters.

Ans: It is an electronic circuit a bistable multivibrator that has two stable states and thereby is capable of serving as one bit of memory. What is a multivibrator? Ans: A multivibrator is an electronic circuit used to implement a variety of sample two state systems such as oscillators, timers and flip-flops. It is characterized by two amplifying devices transistors, electron tubes or other devices cross coupled by resistors and capacitors.

*Ask your students how they arrived at their answers for these qualitative assessments. If they found difficulty understanding the relationship of frequency to impedance for reactive components, I suggest you work through the reactance equations qualitatively with them. Ask your students to identify the respective impedances of all components in a filter circuit for these extreme frequency examples, and the functions of each filter circuit should become very clear to see.*