Digital Signal Processing Mid - I, September - 2014

1.Given that y(n) = x(-n), then the system is
  • Causal
  • Time invariant
  • Non-Causal
  • Causal & time invariant
Answer: C
2.The following is the property of discrete fourier series
  • Linearity
  • Time shifting
  • convolution
  • All
Answer: D
3.An odd signal is also known as ……….. signal
  • Symmetric
  • Asymmetric
  • periodic
  • Random
Answer: B
4.If a signal satisfies x(N+n) = x(n) for all n,then the signal is
  • periodic
  • non periodic
  • Symmetric
  • Asymmetric
Answer: A
5.For a causal LTI system to be stable, all the poles of H(Z) must lie …… in the Z-plane.
  • inside the unit circle
  • outside the unit circle
  • either a or b
  • none of the above
Answer: A
6.The basic elements used to construct the block diagram of discrete time system are
  • Adder, multiplier
  • Only adders
  • Adder, delay element
  • Adder, multiplier & delay element
Answer: D
7.Any discrete time signal can be expressed as a summation of
  • Step
  • Ramp
  • Exponential
  • Impulses
Answer: D
8.The number of complex additions of direct DFT is
  • N
  • N(N-1)
  • N(N+1)
  • N2
Answer: B
9.Any discrete time signal can be expressed as a summation of
  • Step
  • Ramp
  • Exponential
  • Impulse
Answer: D
10.The causal system H(Z) is stable if
  • Z = 2
  • Z = 3
  • Z = 1/2
  • Z = 3/4
Answer: C
11.If the response of the system depends on the past or future samples then the system is called ………….
Answer: Dynamic System
12.FFT stands for ………………….
Answer: Fast Fourier transformer
13.The extraction of information from digital signal is called …
Answer: Digital Signal Processing
14.Random signal is a signal characterized by …………. Before its actual occurance.
Answer: Uncertainty
15.The DFT supports only ………… convolution.
Answer: Circular
16.Z Transform of x(-n) = ……….
Answer: X ( Z -k)
17.Linear convolution of two sequences of length N1 and N2 produces an output sequence of length ……….
Answer: N1 + N2-1
18.…………. is the physical quantity that varies with time , space or any other independent variable.
Answer: Signal
19.Bit reversal is required for ………… algorithm.
Answer: DIT- FFT
20.The number of complex multiplications of radix-2 FFT is ……
Answer: N/2 log2 N