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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. |
Q1 ⇒ The discrete time system describes by y(n) = x(n2) is casual, 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 eas |
Q3 ⇒ In a oscillator, a sine wave generator starts at t = 0. It consist of Pure 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 b FIR [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 cos2(4p x 103t). The convolved signal will 14 kHZ sinusoidal [other wrong options] [Discuss in forum] DC 12 kHZ sinusoidal 8 kHZ sinusoidal |
Q7 ⇒ Two rectangular waveforms of duration t1 and t2 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 are 5 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 Fn in the exponential form of Fourier series 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)
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 f1 (t) and f2 (f) are two functions of time and a and b are constants, then L [af1(t) + bf2(t)] = aF1(s) + bF2(s) [other wrong options] [Discuss in forum] L [af1(t) + bf2(t)] = aF1(s) - bF2(s) L [af1(t) + bf2(t)] =[aF1(s)]/[bF2(s] None of the above |
Q13 ⇒ A signum function is 2∪(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 ⇒ Assertion (A): Impulse function is an important function in network analysis. Reason (R): Convolution integral enables us to find the response of a network to an arbitary input in terms of the impulse response. 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 has single sided spectra [other wrong options] [Discuss in forum] zero sync function undefined |
Q17 ⇒ The inverse Laplace transform of 1/(s - a)2 is t eat [other wrong options] [Discuss in forum] eat t2 eat eat/t |
Q18 ⇒ If a function has only cosine terms, it must satisfy the equation f(-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, mz, mx, my represent mean of Z, X and Y. Then mz = mx + my [other wrong options] [Discuss in forum] mz ≤ mx + my mz< mx + my mz > mx + my |
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 |