Signals and Systems Mid - II, November - 2014

1.The initial value of  is
  • 0
  • 5
  • 5/2
Answer: D
2.If the laplace transform of x(t) is X(S), then  is given by
Answer: B
3.The laplace transform can be implemented easily than fourier transforms if the signal is
  • simple
  • complex
  • discontinuous
  • periodic
Answer: B
4.The laplace transform of cosωt is
Answer: B
5.The reciprocal seconds is called
  • Nyquist Interval
  • Modulation
  • Demodulation
  • Sampling
Answer: A
6.Sampling theorem series as the basis for conversion of analog signal to signals and vice versa
  • Continuous Time
  • Discrete Time
  • Aliasing
  • distortion
Answer: B
7.The convolution theorem states that F[x1(t) * x2(t)] =
Answer: C
8.Covarianceof two independent random variable i
  • Unity
  • Zero
  • Greater than Unity
  • Less than Unity
Answer: B
9.The process of converting a continuous signal in to a discrete signal is called
  • Analog to digital conversion
  • digital to analog conversion
  • Sampling
  • all the above
Answer: C
10.The Z-transform of a discrete signal x(n) = anu(n) is
Answer: B
11.The phenomenon of a high frequency component taking the identity of a low frequency in the sampling version is called ________________
Answer: alising effect
12.Correlation of two signals is measure of ______ between those signals
Answer: similarity
13.Laplace transform of -U(-n-1) ________________
Answer: z/z-1
14.In region of convergence the part of S is greater than  _____________.
Answer: is real
15.Aliasing occurs when the signal is __________
Answer: under sampled
16.The PSD of a random process is a measure of __________
Answer: the frequency distribution of a single random process
17.A band limited signal has no frequency components by on WHz may be completerly recovered from the knowledge of its samples taken at a rate of samples _________________.
Answer: 2w
18.Bandpass signals can be sampled at the minimum rate of ___________.
Answer: twice the bandwidth
19.The Laplace transform is more general than the fourier transform because _______.
Answer: Sis a complex variable
20.The significance of PSD is _____________.
Answer: real