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Recent questions and answers in Digital Signal Processing

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TIFR System Science 2018 Question 1
Consider a discrete-time system which in response to input sequence x[n] (n integer) outputs the sequence y[n] such that $y[n] = 0, n = −1, −2, −3,...$ and $y[n]=2 (y[n − 1] + nx[n]), n = 0, 1, 2,...$. Find out if the system is linear and time-invariant.

analyse asked in Digital Signal Processing Nov 22, 2022

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NIELIT 2022 April Scientist B | Section B | Question: 47
In a baseband communication link, frequencies upto $3500 \; \text{Hz}$ are used for signaling. Using a raised cosine pulse with $75 \%$ excess bandwidth and for no inter symbol interference, the maximum possible signaling rate is symbols $\text{per sec}$ is: $1750$ $2625$ $4000$ $5250$

Bikram 1 answered in Digital Signal Processing Jul 18, 2022

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 8
A carrier $Ac\cos(\omega c)t$ is frequency modulated by a signal $Em\cos(\omega m)t.$ The modulation index is $mf.$ The expression for the resulting FM signal is $Ac\cos [\omega ct + mf\sin(\omega m)t]$ ... $Ac\cos [\omega ct + 2\pi mf Em \cos(\omega m)t/\omega m]$

s_dr_13 answered in Digital Signal Processing Mar 19, 2022

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NIELIT 2016 MAR Scientist C - Section C: 61
Microprogramming is a technique for writing small programs effectively programming output/input routines programming the microprocessors programming the control steps of a computer

shantanumapari17 answered in Digital Signal Processing Mar 20, 2021

by shantanumapari17

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5

NIELIT Scientific Assistant A 2020 November: 60
Term in the $\text{MVC}$ architecture that receives events is called _________. Receiver Controller Transmitter Modulator

Asim Siddiqui 4 answered in Digital Signal Processing Mar 12, 2021

by Asim Siddiqui 4

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NIELIT 2017 July Scientist B (CS) - Section B: 31
At a room temperature of $300K$, calculate the thermal noise generated by two resistors of $10K\Omega$ and $20K\Omega$ when the bandwidth is $10KHz$. $1.2868\times10^{-6}V, 1.819\times10^{-6}V$ $6.08\times10^{-6}V, 15.77\times10^{-6}V$ $16.66\times10^{-6}V, 2.356\times10^{-6}V$ $1.66\times10^{-6}V, 0.23\times10^{-6}V$

Madhav answered in Digital Signal Processing Oct 4, 2020

by Madhav

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NIELIT 2017 DEC Scientific Assistant A - Section B: 8
Microprocessors are used in which generation of computers? I – st Generation II – nd Generation III – rd Generation IV – th Generation

Himanshu Kumar Gupta answered in Digital Signal Processing Sep 20, 2020

by Himanshu Kumar Gupta

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 2
An ideal op-amp is an ideal voltage controlled current source voltage controlled voltage source current controlled current source current controlled voltage source

Himanshu Kumar Gupta answered in Digital Signal Processing Sep 20, 2020

by Himanshu Kumar Gupta

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NIELIT 2017 OCT Scientific Assistant A (IT) - Section D: 1
Twelve $1\;\Omega$ resistances are used as edges to from a cube. The resistance between two diagonally opposite corners of the cube is $\frac{5}{6}\;\Omega$ $\frac{1}{6}\;\Omega$ $\frac{6}{5}\;\Omega$ $\frac{3}{2}\;\Omega$ closed

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2017 OCT Scientific Assistant A (IT) - Section D: 11
In MOSFET fabrication, the channel; length is defined during the process of Isolation oxide growth Channel stop implantation Poly-silicon gate patterning Lithography step leading to the contact pad closed

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 1
Twelve $1\;\Omega$ resistances are used as edges to from a cube. The resistance between two diagonally opposite corners of the cube is $\frac{5}{6}\;\Omega$ $\frac{1}{6}\;\Omega$ $\frac{6}{5}\;\Omega$ $\frac{3}{2}\;\Omega$

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

205 views

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12

NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 3
The final value theorem is used to find the Steady state value of the system output Initial value of the system output Transient behavior of the system output None of these

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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13

NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 4
For the discrete signal $x[n] = a^{n}u[n],a>0$ the $z$-transform is $\frac{(z+a)}{z}$ $\frac{(z-a)}{z}$ $\frac{z}{(z-a)}$ $\frac{z}{(z+a)}$

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 5
For a periodic signal $v(t) = 30\sin 100t + 10\cos 300t + 6\sin(500t + \frac{\pi}{4}),$ the fundamental frequency in rad/s $100$ $300$ $500$ None of these

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 7
If the number of bits per sample in a PCM system is increased from a $n$ to $n+1,$ the improvement in signal to quantization nose ratio will be $3\;dB$ $6\;dB$ $2n\;dB$ $n\;dB$

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 11
In MOSFET fabrication, the channel; length is defined during the process of Isolation oxide growth Channel stop implantation Poly-silicon gate patterning Lithography step leading to the contact pad

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

177 views

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17

NIELIT 2017 OCT Scientific Assistant A (CS) - Section D: 12
The open-loop transfer function of a feedback control system is $G(s)\cdot H(s) = 1/(s+1)^{3}.$ The gain margin of the system is $2$ $4$ $8$ $16$

Lakshman Patel RJIT asked in Digital Signal Processing Aug 28, 2020

by Lakshman Patel RJIT

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NIELIT 2016 DEC Scientist B (CS) - Section B: 60
The sequence of operation in which PCM is done is Sampling, quantizing, encoding Quantizing, sampling, encoding Quantizing, encoding, sampling None of the above

Ollie answered in Digital Signal Processing Jun 10, 2020

by Ollie

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NIELIT 2016 DEC Scientist B (CS) - Section B: 41
The IETF standard documents are called: RFC RCF ID none of the above

Ollie answered in Digital Signal Processing Jun 10, 2020

by Ollie

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20

NIELIT 2016 DEC Scientist B (CS) - Section B: 17
$T1$ carrier system is used: For delta modulation Industrial noise For frequency modulated signals None of the above

Mohit Kumar 6 answered in Digital Signal Processing May 25, 2020

by Mohit Kumar 6

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21

NIELIT 2016 MAR Scientist C - Section C: 48
In a microprocessor, WAIT states are used to make the processor wait during a DMA operation make the processor wait during a power interrupt processing make the processor wait during a power shutdown interface slow peripherals to the processor

Mohit Kumar 6 answered in Digital Signal Processing May 19, 2020

by Mohit Kumar 6

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1 answer

22

NIELIT 2016 DEC Scientist B (CS) - Section B: 25
A low pass filter is Passes the frequencies lower than the specified cut off frequency Used to recover signal from sampled signal Rejects higher frequencies All of the above

Sabirazain answered in Digital Signal Processing Apr 25, 2020

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NIELIT 2016 MAR Scientist C - Section C: 42
A stable multivibrator are used as comparator circuit squaring circuit frequency to voltage converter voltage to frequency converter

Lakshman Patel RJIT asked in Digital Signal Processing Apr 2, 2020

by Lakshman Patel RJIT

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NIELIT 2016 MAR Scientist C - Section C: 43
The astable multivibrator has two quasi stable states two stable states one stable and one quasi-stable state none of these

Lakshman Patel RJIT asked in Digital Signal Processing Apr 2, 2020

by Lakshman Patel RJIT

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25

NIELIT 2017 OCT Scientific Assistant A (CS) - Section B: 27
At $100\%$ modulation, the power in each sideband is _______ of that of carrier. $50\%$ $40\%$ $60\%$ $25\%$

Lakshman Patel RJIT asked in Digital Signal Processing Apr 1, 2020

by Lakshman Patel RJIT

202 views

3 votes

3 answers

26

ISRO2011-64
When n-type semiconductor is heated? number of electrons increases while that of holes decreases number of holes increases while that of electrons decreases number of electrons and holes remain the same number of electron and holes increases equally

midhunraj answered in Digital Signal Processing Jan 7, 2020

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27

KPGCET-CSE-2019-49
The communication network comprises number of base stations. The scope of each base station covers the circular area. To avoid the overlapping and gaping of areas, the scope of each base station is accounted by Rectangle Pentagon Hexagon Octagon

gatecse asked in Digital Signal Processing Aug 4, 2019

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28

KPGCET-CSE-2019-51
In a communicative network, though the scope of base station is circular area, the network scope is represented by______ shape, as it is nearest to the circular area. triangular rectangular pentagonal hexagonal.

gatecse asked in Digital Signal Processing Aug 4, 2019

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2 votes

3 answers

29

UGC NET CSE | June 2016 | Part 3 | Question: 58
Consider a discrete memoryless channel and assume that H(x) is the amount of information per symbol at the input of the channel; H(y) is the amount of information per symbol at the output of the channel. H(x $\mid$ y) is the amount of uncertainty remaining on x knowing y; and I( ... $\mid$ y)]; p(x) max H(x $\mid$y); p(x)

Adnan Ashraf answered in Digital Signal Processing May 3, 2019

by Adnan Ashraf

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1 answer

30

UGC NET CSE | December 2014 | Part 3 | Question: 66
A Butterworth lowpass filter of order $n$, with a cutoff frequency at distance $D_{0}$ from the origin, has the transfer function $H(u, v)$ given by $\frac{1}{1+\left[\frac{D(u, v)}{D_{0}}\right]^{2n}}$ ... $\frac{1}{1+\left[\frac{D_{0}}{D(u, v)}\right]^{n}}$

Sanjay Sharma answered in Digital Signal Processing Jan 5, 2017

by Sanjay Sharma

1.1k views

3 votes

1 answer

31

UGC NET CSE | December 2014 | Part 3 | Question: 64
Given two spatial masks $S_{1}= \begin{bmatrix} 0&1&0 \\ 1&-4&0 \\ 0&1&0 \end{bmatrix}$ $S_{2} = \begin{bmatrix} 1&1&1 \\ 1&-8&1 \\ 1&1&1 \end{bmatrix}$ ... can be used as the spatial mask ? only $S_{1}$ only $S_{2}$ Both $S_{1}$ and $S_{2}$ None of these

Sanjay Sharma answered in Digital Signal Processing Dec 23, 2016

by Sanjay Sharma

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32

3sin(200rt) is amplitude modulated with 600
3sin(200rt) is amplitude modulated with 600s(6000rt) Find the spectral response and expression of the AM signal generated

rahuldb asked in Digital Signal Processing Nov 28, 2016

249 views

1 vote

1 answer

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UGC NET CSE | December 2012 | Part 3 | Question: 60
The transform which posses ‘multi-resolution’ property is Fourier transform Short-time Fourier transform Wavelet transform Karhunen-Loere transform

shekhar chauhan answered in Digital Signal Processing Jul 13, 2016

by shekhar chauhan

1.3k views

3 votes

1 answer

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UGC NET CSE | June 2012 | Part 2 | Question: 18
Page Shift Keying (PSK) Method is used to modulate digital signal at 9600 bps using 16 level. Find the line signals and speed (i.e., modulation rate) 2400 bauds 1200 bauds 4800 bauds 9600 bauds

Sanjay Sharma answered in Digital Signal Processing Jul 5, 2016

by Sanjay Sharma

3.2k views

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