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Signals and systems
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The DTFT of x(n) = δ(n) will be 1 [other wrong options] [Discuss in forum] 0 ∞ not defined |
Q22 ⇒ The function shown in the fig signum function [other wrong options] [Discuss in forum] impulse function unit step function none of the above |
Q23 ⇒ Which one of following is correct condition to check the stability of sysytem in terms of impulse response? Σ(x(n)) < ∞ [other wrong options] [Discuss in forum] Σx(n) < 0 Σx(n) = 0 Σx(n) = ∞ |
Q24 ⇒ Highest value of autocorrelation function 100 sin 50 pt is zero [other wrong options] [Discuss in forum] 50 100 100/p |
Q25 ⇒ The integral of unit step function is a ramp of slope unity. TRUE [other wrong options] [Discuss in forum] FALSE |
Q26 ⇒ The power in the signal s(t) = 8 cos (20 p - p/2) + 4 sin (15 pt) is 40 [other wrong options] [Discuss in forum] 41 42 82 |
Q27 ⇒ Auto correlation for t = 0 is equal to average power S of waveform [other wrong options] [Discuss in forum] square of average power S of waveform half of average power S of waveform square root of average power S of waveform |
Q28 ⇒ A casual LTI system is described by the difference equat |a| < 2 any value of β [other wrong options] [Discuss in forum] |a| = 2 |β| < 2 |a| > 2 |β| > 2 |β| < 2, any value of a |
Q29 ⇒ Assertion (A): A half cycle of sine wave can be expressed as sum of sine wave and another sine wave shifted by T/2 where T is the time period. Reason (R): The function u(t - t0) - u(t - t0 - T) is a gate function occuring at t = t0 and of duration T. Both A and R are correct but R is not correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct and R is correct explanation of A A is true, R is false A is false, R is true |
Q30 ⇒ L[c1f1(t) + c2f2(t)] = c1 F1 (jω) + c2 F2(jω) [other wrong options] [Discuss in forum] c1 F1 (jω) - c2 F2(jω) c1 F1 (jω) + c2 F2(jω) + c1c2 c1 F1 (jω) + c2 F2(jω) + c1/c2 |
Q31 ⇒ Assertion (A): In complex frequency s = σ + jω, the terms s and ω are nepar frequency and radin frequency. Reason (R): If ω = 0, the graph of Kest will be a decaying exponential if s < Both A and R are correct but R is not correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct and R is correct explanation of A A is true, R is false A is false, R is true |
Q32 ⇒ The area of an impulse is 1 [other wrong options] [Discuss in forum] 0 ∞ any finite value |
Q33 ⇒ If a signal g(t) has energy E, then the energy of the signal g(2t) is equal to ... E/2 [other wrong options] [Discuss in forum] E/4 E 2E |
Q34 ⇒ Which one condition is true to check the periodically for discrete time signal (where K is any integer, N is period, f0 is frequency of signal) f0 = K/N [other wrong options] [Discuss in forum] f0 = K + N f0 = KN f0 = N/K |
Q35 ⇒ The energy of highest value of Autocorrelation of a function 100 cos 50 pt is 10 [other wrong options] [Discuss in forum] 50 200 zero |
Q36 ⇒ Inverse Fourier transform of '1' is δ(t) [other wrong options] [Discuss in forum] U(t) 0' infinite |
Q37 ⇒ Energy density function is always even [other wrong options] [Discuss in forum] odd neither even nor odd both (a) and (b) |
Q38 ⇒ For a Gaussian process, auto-correlation sequence also implies that statistical dependence [other wrong options] [Discuss in forum] statistical independence ergodic process all |
Q39 ⇒ Fourier transform of non periodic DT signal is Periodic [other wrong options] [Discuss in forum] aperiodic both a and b None of these |
Q40 ⇒ x = AX + Bu is a state equation. TRUE [other wrong options] [Discuss in forum] FALSE |
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