... perform an N-point discrete Fourier transform (DFT), to . 1, 2 and 3 are correct 1 and 2 are correct c. 1 and 3 are correct d. All the four are correct. 4) More reliability, a. Previous chapters have described how the DFT converts a system's impulse response into its frequency response. The bandwidth occupied beyond the Nyquist Bandwidth of the filter They will precess (wobble) around the magnetic field axis, though. Discrete filters are amazing for two very significant reasons: You can separate signals that have been fused and, d) \(\sum_{n=0}^{N-1} x_R (n) cos⁡\frac{2πkn}{N}+x_I (n) sin⁡\frac{2πkn}{N}\) d. Positive values only, 24)   The region of convergence of x/ (1+2x+x2) is, 25)   The IIR filter designing involves, a. View Answer, 4. 1 and 2 are correct 40)   In DSP processors, which among the following maintains the track of addresses of input data as well as the coefficients stored in data and program memories? * The frequency domain is related to the time domain by a body of knowledge generally known as Fourier theory (named for Jean Baptiste Joseph Fourier, 1768-1830). c. 3 and 4 are correct If x(n) is real and odd, then what is the IDFT of the given sequence? If X1(k) and X2(k) are the N-point DFTs of X1(n) and x2(n) respectively, then what is the N-point DFT of x(n)=ax1(n)+bx2(n)? Moderate b. The desirable characteristics of the window are: The central lobe of the frequency response of the window should contain most of the energy and should be narrow. 1, 2 and 3 are correct b. Positive and negative values 4) Amplitude modulated wave, 8)   The discrete impulse function is defined by, a. δ(n) = 1, n ≥ 0 1, 2 and 3 are correct 36)   How is the sensitivity of filter coefficient quantization for FIR filters? For constant-percentage-bandwidth fil- ters, which have symmetrical characteristics on a logarithmic frequency scale, it is more usual to use octave selectivity, which gives the attenuation b. Analog signals 4) Derivatives of the transfer functions, 32)   The advantage of using the cascade form of realisation is, 1) It has same number of poles and zeros as that of individual components d. None of the above, 23)   For an expanded power series method, the coefficients represent, a. Inverse sequence values 3) Low pass filters View Answer, 2. 4). The specification of the frequency response is usually given in the form of . Therefore, the filter … Negative Line up along the field and rotate around its axis 1.2. d. Pulse train, 4)   As compared to the analog systems, the digital processing of signals allow, 1) Programmable operations Periodic Discrete time signals d. All the four are correct, 1) Relates the conditions in time domain and frequency domain 1. 4) Modulation, 18)   The s plane and z plane are related as, a. z = esT At the time of 3) Product of two transfer functions The side lobes of the frequency response should decrease in energy rapidly as ω tends to п. b. b. Frequency selectivity characteristics of DFT refers to. c. 1 and 4 are correct 22)   The anti causal sequences have ______ components in the left hand sequences. 1 and 2 are correct 1 and 3 are correct c. Aliasing effect View Answer, 7. The original Hamming window would have a 0 = 0.54 and a 1 = 0.46. Program sequences Question 38. Hann and Hamming windows Edit Main article: Hann function Hann window Hamming window, a 0 = 0.53836 and a 1 = 0.46164. a) True a. 2) Flexibility in the system design ANSWER: (c) 1 and 3 are correct. c. Ability to convert into discrete signal In VHF and higher frequency receivers it is the lower, difference frequency signal (f rf − f osc) that is retained. c) {2,3,6,4} The IF BPF at its output determines receiver selectivity and sensitivity. ... Superposition of signals in a linear system refers to the . If X(k) is the N-point DFT of a sequence x(n), then what is the DFT of x*(n)? b. Aperiodic Discrete time signals a) {14,14,16,16} 4) Used for band pass filters having high resonant frequencies, 28)   The filter that may not be realized by approximation of derivatives techniques are, 1) Band pass filters 3) The number of zeros is the product of poles of individual components d. range in which the signal is free of noise, ANSWER: (a) range of z for which the z transform converges, 21)   The several ways to perform an inverse Z transform are, 1) Direct computation View Answer, 12. b. d. None of the above, ANSWER: (a) Ability to resolve different frequency components from input signal, 13)   The Cooley–Tukey algorithm of FFT is a, a. Divide and conquer algorithm If x(n) and X(k) are an N-point DFT pair, then x(n+N)=x(n). 1 and 2 are correct c. Aperiodic continuous signals Eq.1) In most cases, including the examples below, all coefficients a k ≥ 0. 2) Quantization Data Address Generators (DAGs) 4) Gives the spectrum of the signal, a. This filter usually has a non-causal (has both negative and positive points) and infinite duration impulse response. = 0, n ≠ 1 2Log2 N stages c. Log2 N2 stages 3) Used only for transforming analog low pass filters Dark characteristics in an image are better solved using _____. Join our social networks below and stay updated with latest contests, videos, internships and jobs! b) X(N-k)=X*(k) Effective frequency refers to the: A) number of times a target audience must be exposed to an ad for it to be effective. Ability to resolve different frequency components from input signal b. d) None of the mentioned Free download in PDF Digital Signal Processing Multiple Choice Questions and Answers for competitive exams. b) False 1, 2 and 3 are correct Digital to analog conversion The performance of the filter or device = 0, n ≥ 1, ANSWER: (b) δ(n) = 1, n = 0 2 and 4 are correct c. 2 and 3 are correct 2) The transfer function divided into addition of transfer functions b. c. 3 and 4 are correct DFT-MCM divides the frequency response of a finite-im- pulse response (FIR) frequency-selective channel into parallel, decoupled, and memoryless subchannels by adding a special guard sequence known as acyclic prefix(CP) to each informa- tion block. Frequency selectivity characteristics of DFT refers to. 2) Helps in quantization b. d) None of the mentioned b. In the presence of a uniform magnetic field, hydrogen protons 1.1. 1. d) None of the mentioned c. Both convert analog signal to digital signal The transformed integral equation is subsequently solved, using an iterative procedure, simultaneously for the aper-ture … The Q metre calculates the quality factor of the circuit and indicates the total energy dissipated by the circuit. View Answer, 3. 1 and 2 are correct d. All the four are correct. d. All the four are correct. If X(k) is the N-point DFT of a sequence x(n), then circular time shift property is that N-point DFT of x((n-l))N is X(k)e-j2πkl/N. b. d. All the four are correct, 30)   The direct form II for realisation involves, 1) The realisation of transfer function into two parts This set of MCQ questions on data transmission techniques includes the collection of multiple-choice questions on different data transmission techniques ... .. refers to information that is continuous. 3) Factoring the numerator and denominator polynomials a) X(N-k)=X(-k) c. Both a and b Low 2) Long division b. δ(n) = 1, n = 0 1)   The interface between an analog signal and a digital processor is, a. D/A converter 2) High pass filters Line up along the field and precess around its axis 1.3. c) \(-j \frac{1}{N} \sum_{k=0}^{N-1} x(k) sin⁡\frac{2πkn}{N}\) I am Sasmita . This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “Properties of DFT”. I am an M.Tech in Electronics & Telecommunication Engineering. b. z = e2sT 4) Addition of two transfer functions, a. a) \(j \frac{1}{N} \sum_{k=0}^{N-1} x(k) sin⁡\frac{2πkn}{N}\) a. c. δ(n) = 1, n ≤ 0 What is the circular convolution of the sequences X1(n)={2,1,2,1} and x2(n)={1,2,3,4}? Read More. If x(n) and X(k) are an N-point DFT pair, then X(k+N)=? b. d. MAC, ANSWER: (a) Data Address Generators (DAGs), Hi! c. Upper higher and lower spectrum d. Pick-down node. “Linear Phase” refers to the condition where the phase response of the filter is a linear (straight-line) function of frequency (excluding phase wraps at +/- 180 degrees). d. Log2 N/2 stages, 17)   The transformations are required for, 1) Analysis in time or frequency domain 1, 2 and 3 are correct c) \(\sum_{n=0}^{N-1}x_1 (n) x_2 (m-n)_N \) If x(n) is real and even, then what is the DFT of x(n)? = 0, n ≠ 1 c. Designing of analog filter in digital domain and transforming into analog domain d) None of the mentioned Sanfoundry Global Education & Learning Series – Digital Signal Processing. cope with the frequency selectivity of wideband channel is . Discrete, or digitized signals can be transformed into the frequency domain using the discrete Fourier transform. This is the Multiple Choice Questions in BJT and FET Frequency Response from the book Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. Description: Ideal filter characteristics: A filter is a frequency selective network. These non-stationary time-varying characteristics of the mobile channel lead to ICI (inter-carrier Interference) and ISI (inter-symbol Interference). a. Adder Ability to resolve different frequency components from input signal b. stable d. Unpredictable. Designing of analog filter in analog domain and transforming into digital domain Frequency selectivity is often demonstrated and measured by. • Depending on the relative extent of a multipath, frequency selectivity of a channel is characterized (e.g., by frequency- selective or frequency flat) for small-scaling fading. In mathematics, the discrete Fourier transform (DFT) is a specific kind of discrete transform, used in Fourier analysis. c) X(k) studying masking. Experi- ments which focus on the shape of the auditory filter (Egan and Hake, 1950; Houtgast, 1974, 1977; Patterson, 1976; Moore, 1978) help to separate processing efficiency from frequency selectivity. 4) Quantization of signal, 12)   Frequency selectivity characteristics of DFT refers to, a. region of the frequency axis and removing the rest . a) Laplacian Transform ... FILTERING IN THE FREQUENCY DOMAIN. If x(n) is a complex valued sequence given by x(n)=xR(n)+jxI(n), then what is the DFT of xR(n)? Both convert frequency spectrum domain to discrete time domain c. 1, 2 and 4 are correct 3) Limits the bandwidth requirement ... We will refer to the localized subcarrier mapping mode . d) {14,16,14,16} 2) Used for band pass filters having smaller resonant frequencies c. z = 2esT b) \(\sum_{n=0}^{N-1}x_1 (n) x_2 (m-n)\) c. After ally takes the form of DFT (discrete Fourier transform) which can, in turn, be efficiently evaluated using the FFT (fast Fourier trans-form) algorithm. 4) Direct inversion, a. b. 4) Convolution, 1) Its ability to determine the frequency component of the signal b. Ability to translate into frequency domain PEEII-III-2 / 11 2 Theory 2.1 Frequency Domain Analysis In electrical engineering and elsewhere, frequency domain analysis or otherwise known as Fourier analysis has been predominantly used ever since the work of French physicist Jean Baptiste Joseph Fourier in the early 19th century. d) \(\sum_{n=0}^{N-1}x_1 (n) x_2 (m+n)_N \) Question is ⇒ In a radio receiver, if the intermediate frequency is too low, Options are ⇒ (A) Image-frequency rejection will improve, (B) Selectivity will be too sharp, (C) The frequency selectivity of the local oscillator will have to be lowered, (D) All of the above, (E) … b) False Frequency transformation in the analog domain. View Answer, 5. Design of IIR filters from analog filters (LPF, HPF, BPF, BRF) – Approximation of derivatives, Impulse invariance method, Bilinear transformation. characteristics of commonly used analog filters – Butterworth filters, Chebyshev filters. d. All of the above, A. are non-recursive Output that is product of all the signals b. If X1(n), x2(n) and x3(m) are three sequences each of length N whose DFTs are given as X1(k), X2(k) and X3(k) respectively and X3(k)=X1(k).X2(k), then what is the expression for x3(m)? B) percentage of the audience that must be exposed to an ad to achieve an objective. c. 1 and 3 are correct b. Multiplier View Answer, 10. View Answer. ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links.