all energy signals will have an average power of

d) Neither odd nor even functions b) x(t)-x(-t) c) {1,2,4} b) Finite d) -6 Power signal So for a periodic input we can calculate the average power only within a period, not considering total time duration. a) \(\frac{1}{s+4}\) (1.8) that lim (1.10) An example of a finite-energy signal is a signal that takes on the value 1 for 0 < t … To have > zero average power, a signal must be brief and averaged over all time, > or everywhere zero. View Answer, 8. View Answer, 11. b) Zero The average power of signal is defined by; A signal can be categorized into energy signal or power signal: An energy signal has a finite energy, 0 < E < ∞. View Answer, 7. Also sketch x(t) for -6 load). 1. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. In other words, energy signals have values only in the limited time duration. d) 1+2s+s2 c) Zero Note: Based on definitions, the following points of Energy and power signals are defined as A signal x(t) referred to be an energy signal if and only if the total energy E is finite i.e. Note that a stationary process, for instance, may have a finite power but an infinite energy. A sinusoidal signal has finite, non-zero power but infinite energy. So the average power is a finite one, like sine wave. c) \(\frac{π}{2}\) Since the current and the voltage both depend on time in an ac circuit, the instantaneous power is also time dependent. d) Integrating View Answer, 3. But the energy of the signal is not finite because the signal is not approaching towards zero as time approaches towards infinity. Which of the following is done to convert a continuous time signal into discrete time signal? a) True The energy in the time-domain representation of a signal is the same as in the frequency domain representation normalized by ___________ For example, a signal having only one square pulse is energy signal. > > > - An energy signal has zero average power. For a continuous time signal x(t) to be periodic with a period T, then x(t+mT) should be equal to ___________ Join our social networks below and stay updated with latest contests, videos, internships and jobs! a) Linear for any value of b Hi, I'm wondering how do we calculate the average Power of a random (non-periodic) signal. The even part of a signal x(t) is? a) Infinite © 2011-2020 Sanfoundry. (c) x(t) = t - … Signal Energy & Power Tips • There are a few rules that can help you determine whether a signal has finite energy and average power • Signals with finite energy have zero average power: E∞ < ∞⇒P∞ =0 • Signals of finite duration and amplitude have finite energy: x(t)=0for |t| >c⇒ E∞ < ∞ This set of Digital Signal Processing Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Signals”. d) (1/2)*(x(t)-x(-t)) Then the fundamental period of x(t)=x1(t)+x2(t) is? If you previously took electricity or natural gas service from your local utility, you may not have had to sign a contract. View Answer, 15. The deflection voltage of an oscilloscope is a ‘deterministic’ signal. d) {1,3,7} The signal power of the signal x (t) = 2sin 2t + 4sin 4t + 6cos 4t + 2cos 2t with period 0.5 is ________________ a) cost b) T1-T2 a) x(t)+x(-t) Energy or power is a constant value. A periodic signal has power \(\frac{P}{4}\) equal to average energy per period then rms value of signal is given by ________________ They make it possible to have cell phone service, Wi-Fi, and digital broadcast television programming. a) {1,3,7,7,7,6,4} For years and years, smart minds have been thinking about catching these radio frequency waves around us to recycle them for something else. d) Does not depend on the average energy value d) 16 π 0 < E < ∞, and so average … Infinite energy indicates that the signal duration is likely infinite, so it doesn’t make sense to deal with energy. Periodic signals Are power signals because they have finite “Average Power” and Infinite “Energy” i-e 0 > infinite average energy. The convolution y [n] = x [n] * h [n], where x [n] = {1,2,4} and h [n] = {1,1,1,1,1} is ________________ b) Finite b) Linear if b>0 x3(t) = ealphatu(-t). To practice all areas of Signals & Systems, here is complete set of 1000+ Multiple Choice Questions and Answers. Another (related) motivation comes from the Parseval's theorem b) x(mT) For a LTI system consisting of two integrators, the output of the first integrator is inverted and fed as input to the sigma at beginning and output of the second integrator is also inverted and fed as input to the sigma at the beginning. c) e-3t Example: Periodic sequences like sinusoid. View Answer, 10. d) 1 W Such a signal must have zero average power, since in the continuous time case, for example, we see from eq. d) Cannot be calculated b) 2*pi This is the case of electric signals, but the analogy applies in other fields. 170V peak voltage: that sinusoid has the same energy as a constant 120V voltage. That's why AC energy is typically measured in RMS units: a 120V power outlet gives a sinuosid of approx. It might seem that it is almost always true that adding two signals, with average power and , respectively, gives a signal of average power ; but beware the following counterexample: if you add a signal to itself you will double all its values and so the average power will be multiplied by 4, not 2. b) False View Answer, 4. c) Differentiating a) T1+T2 • energy signals have values only in the limited time duration. All energy signals will have an average power of ___________ a) Infinite c) T1/T2 You may have noticed that the average power value of 205.2 watts is also the first term value of the instantaneous power p (t) as this first term constant value is the average or mean rate of energy change between the source and load. (for periodic signal x(t), Period=T0 ) (for x(t) filtered by H(f) ) Which of the following is the odd component of the signal x(t)=e(jt)? (ii) $ x[n] = u[n]$ The signal is periodic because u(n) repeats after every sample and of infinite duration. A system has a block G1(s) which has input x (s) and output y1(s). Time Domain Representation for LTI Systems, Signal Transmission Through Linear Systems, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Signals & Systems Questions and Answers – Trigonometric Fourier Series, Next - Signals & Systems Questions and Answers – Power and Energy Signals, Signals & Systems Questions and Answers – Trigonometric Fourier Series, Signals & Systems Questions and Answers – Power and Energy Signals, Analog Communications Questions and Answers, Mechatronics Engineering Questions and Answers, Electronics & Communication Engineering Questions and Answers, Electrical Engineering Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Instrumentation Engineering Questions and Answers, Electronic Devices and Circuits Questions and Answers, Linear Integrated Circuits Questions and Answers, Energy & Environment Management Questions and Answers, Digital Signal Processing Questions and Answers. Given signal given, \( y (t) = 2sin (\frac{2}{3} t) + 4sin (\frac{1}{4} t – \frac{π}{4}) + 6sin⁡ (\frac{1}{3} t – \frac{π}{5}) + 8sin⁡ (\frac{1}{2} t – \frac{π}{7}\)). a) e-2t + e-t c) Both odd and even functions c) 60 W For the signal \(x (t) = δ(t) – \frac{4}{3} e^{-t} \,u(t) + \frac{1}{3} e^{2t} \,u(t)\). c) ∞ View Answer, 10. For these, Mathematically, a signal can have infinite power, but that’s not a practical reality. The resultant signal obtained after frequency convolution along with constant multiplier \(\frac{1}{2πj}\) of the signals whose Laplace transforms are given by, \(\frac{1}{s+2}\) and \(\frac{1}{s+1}\). • The Auto-Correlation function of x(t) (real valued signal) is • The Time-Average Auto-Correlation function (for power signals) • The Power Spectral Density (P.S.D) for a signal is • The Total Power id the integral of the P.S.D. c) Linear if b<0 View Answer. d) e-t c) 0.5 W b) π b) HCF of T1and T2 d) None of the mentioned Power spectral density of the signal given below is _______________ The system characterized by the equation y (t) = ax (t) + b is ____________ here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Digital Signal Processing Questions and Answers – A2D and D2A Converters, Next - Digital Signal Processing Questions and Answers – Signals, Systems and Signal Processing, Data Science Questions and Answers – Big Data, Steam and Gas turbines Questions – Fundamentals of Thermodynamics, Electrical Measurements Questions and Answers, Instrumentation Transducers Questions and Answers, Information Technology Questions and Answers, Biomedical Instrumentation Questions and Answers, Mechatronics Engineering Questions and Answers, Instrumentation Engineering Questions and Answers, Electronics & Communication Engineering Questions and Answers, Electrical Engineering Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Digital Communication Questions and Answers, Digital Image Processing Questions and Answers, Digital Signal Processing Questions and Answers. Explanation: A signal is said to be an energy signal if and only if the average energy of the signal is finite. Hence it is a Power Signal Sanfoundry Global Education & Learning Series – Signals & Systems. Join our social networks below and stay updated with latest contests, videos, internships and jobs! View Answer, 8. All Rights Reserved. Radio frequency signals are all around us. c) (1/2)*(x(t)+x(-t)) c) j*cost View Answer, 2. c) 2, 0 a) x(-t) c) 8 π a) 0.25 W Energy and Power signals Energy signal • has a finite energy, 0 < E < ∞. The signal power of the periodic rectangular pulses of height 1 and width 1, is _______________ After all, energy is the integral of power, and the stationary signal continues over an infinite time. Therefore, the signal is a power signal. View Answer, 5. To practice all areas of Digital Signal Processing, here is complete set of 1000+ Multiple Choice Questions and Answers. a) 2π > > > Huh? A circuit element dissipates or produces power according to where I is the current through the element and V is the voltage across it. It is a positive number for all non-zero magnitudes. Problem 1 Determine the total energy E and the average power P of the following signals. When energy is taken from an object or a component (such as an inductor or capacitor or spring or flywheel), the amount of energy taken divided by the time elapsed to take that energy is power. All Rights Reserved. AC Power in a Purely Resistive Circuit. b) 2, 2 Over a long time period, this is often called "average power" Therefore, for a signal possessing the energy to have zero power, I guess you d) Non-linear Given a periodic function having half wave symmetry. (b) r(t) = t is a periodic signal with fundamental period T = 4. The input is x (t) and output y (t), the transfer function is ______________ Find the normalized power for each signal below that is a power signal and the normalized energy for each signal that is an energy signal. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic? View Answer, 7. Then the function is ________________ © 2011-2020 Sanfoundry. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. The energy of the power signal will be infinite. d) x(t)

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