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**Home⇒ Engineering⇒ Signals and systems**

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Q1 ⇒ The discrete time system describes by y(n) = x(n^{2}) iscasual, Linear, time varying[other wrong options] [Discuss in forum] casual, non-linear, timevari non-casual, Linear, time invariant non-casual, non-linear, time variant |

Q2 ⇒ If F(t) = δ(t - a), F(s)=e^{-as}[other wrong options] [Discuss in forum] 0 1 e^{as} |

Q3 ⇒ In a oscillator, a sine wave generator starts at t = 0. It consist ofPure sine wave[other wrong options] [Discuss in forum] Pure cosine wave Unity for t > 0 2∪( t) - 1 |

Q4 ⇒ Consider z transform of a signal as given bFIR[other wrong options] [Discuss in forum] IIR Depends on value of n Cannot determined |

Q5 ⇒ In a Communication system, noise is most likely to affect the signal.In the channel[other wrong options] [Discuss in forum] at the transmitter in Information source at the destination |

Q6 ⇒ A rectangular pulse train s(t) is shown in figure is convolved with the signal cos^{2}(4p x 10^{3}t). The convolved signal will14 kHZ sinusoidal[other wrong options] [Discuss in forum] DC 12 kHZ sinusoidal 8 kHZ sinusoidal |

Q7 ⇒ Two rectangular waveforms of duration t_{1} and t_{2} seconds are convolved. What is the shape of the resulting waveform?Trapezoidal[other wrong options] [Discuss in forum] Triangular Rectangular Semi-circular |

Q8 ⇒ The range of values of a and b for which the linear time invariant system with impulse respon|a| < 1, |b| > 1[other wrong options] [Discuss in forum] | a| > 1, |b| > 1 | a| < 1, |b| < 1 | a| > 1, |b| < 1 |

Q9 ⇒ The current in a circuit with 10 Ω resistance is i = 3 + 4 sin (100 t + 45°) + 4 sin (300 t + 60°) A. The rms current and power dissipated are5 A and 250 W[other wrong options] [Discuss in forum] 41 A and 410 W 35 A and 350 W 11 A and 1210 W |

Q10 ⇒ It f(t) is an odd function, the coefficients F in the exponential form of Fourier series_{n}are imaginary[other wrong options] [Discuss in forum] are real are complex may be real or imaginary |

Q11 ⇒ consider the following as regards cumulative disribution function F(x)- 0 ≤ F(
*x*) ≤ 1 - F(- ∞) = 0
- F(∞) = 1
- F(
*x*_{1}) ≤ F(*x*_{2}) If*x*_{1}<*x*_{2}
1, 2, 3 and 4[other wrong options] [Discuss in forum] 1 and 2 only 1, 2 and 3 only 2 and 4 |

Q12 ⇒ If f_{1} (t) and f_{2} (f) are two functions of time and a and b are constants, thenL [af_{1}(t) + bf_{2}(t)] = aF_{1}(s) + bF_{2}(s)[other wrong options] [Discuss in forum] L [ af_{1}(t) + bf_{2}(t)] = aF_{1}(s) - bF_{2}(s) L [ af_{1}(t) + bf_{2}(t)] =[aF_{1}(s)]/[bF_{2}(s] None of the above |

Q13 ⇒ A signum function is2∪(t) - 1[other wrong options] [Discuss in forum] zero for t greater than zero zero for t less than zero unity for t greater than zero |

Q14 ⇒
Both A and R are correct and R is correct explanation of A[other wrong options] [Discuss in forum] Both A and R are correct but R is not correct explanation of A A is true, R is false A is false, R is true |

Q15 ⇒ Which of following is recursive system?y(n - 1)[other wrong options] [Discuss in forum] y(n + 1) y(n) y(n) + y(n + 1) |

Q16 ⇒ A trigonometric series hassingle sided spectra[other wrong options] [Discuss in forum] zero sync function undefined |

Q17 ⇒ The inverse Laplace transform of 1/(s - a)^{2} ist e^{at}[other wrong options] [Discuss in forum] e ^{at}t^{2} e ^{at}e/^{at}t |

Q18 ⇒ If a function has only cosine terms, it must satisfy the equationf(-t) = f(t)[other wrong options] [Discuss in forum] f(t) = -f(t) f(-t) = -f(t) none of the above |

Q19 ⇒ X and Y are two random variables and Z = X + Y . Letmz, m, m_{z}, m_{x} represent mean of Z, X and Y. Then_{y}m = _{z}m + _{x}m_{y}[other wrong options] [Discuss in forum] m ≤ _{z}m + _{x}m _{y}m< _{z}m + _{x}m _{y}m > _{z}m + _{x}m _{y} |

Q20 ⇒ A system has poles at 0.01 Hz, 1 Hz and 80 Hz, zeros at 5 Hz, 100 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is-90°[other wrong options] [Discuss in forum] 0° 90° -180° |

Or |