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**Home⇒ Engineering⇒ Signals and systems**

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Q21 ⇒ The DTFT of x(n) = δ(n) will be1[other wrong options] [Discuss in forum] 0 ∞ not defined |

Q22 ⇒ The function shown in the figsignum 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] Σ x(n) < 0 Σ x(n) = 0 Σ x(n) = ∞ |

Q24 ⇒ Highest value of autocorrelation function 100 sin 50 pt iszero[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) is40[other wrong options] [Discuss in forum] 41 42 82 |

Q27 ⇒ Auto correlation for t = 0 is equal toaverage 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 ⇒
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[c_{1}f_{1}(t) + c_{2}f_{2}(t)] =c_{1} F_{1} (jω) + c_{2} F_{2}(jω)[other wrong options] [Discuss in forum] c_{1} F_{1} (jω) - c_{2} F_{2}(jω) c_{1} F_{1} (jω) + c_{2} F_{2}(jω) + c_{1}c_{2} c_{1} F_{1} (jω) + c_{2} F_{2}(jω) + c_{1}/c_{2} |

Q31 ⇒
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 is1[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, f_{0} is frequency of signal)f_{0} = K/N[other wrong options] [Discuss in forum] f_{0} = K + N f_{0} = KN f_{0} = N/K |

Q35 ⇒ The energy of highest value of Autocorrelation of a function 100 cos 50 pt is10[other wrong options] [Discuss in forum] 50 200 zero |

Q36 ⇒ Inverse Fourier transform of '1' isδ(t)[other wrong options] [Discuss in forum] U( t) 0' infinite |

Q37 ⇒ Energy density function is alwayseven[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 thatstatistical dependence[other wrong options] [Discuss in forum] statistical independence ergodic process all |

Q39 ⇒ Fourier transform of non periodic DT signal isPeriodic[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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