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Signals and Systems problems

  • 1. If Electronics and Communication Engineering Signals and Systems: If is the Laplace tran is the Laplace transform of f(t) then f(0+) is

  • Options
  • A. 0
  • B.
  • C. 27
  • D. ?
    • Discuss
  • 2. Inverse Fourier transform of sgn (?) is

  • Options
  • A.
  • B. 1
  • C. U(t)
  • D.
    • Discuss
  • 3. If I (s) Electronics and Communication Engineering Signals and Systems: If I (s) , init , initial value of i(t) is

  • Options
  • A. 5A
  • B. 12.5 A
  • C. 0.05 A
  • D. 1250 A
    • Discuss
  • 4. The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 pt + 2 sin 700 pt then folding frequency is

  • Options
  • A. 500 Hz
  • B. 700 Hz
  • C. 300 Hz
  • D. 1400 Hz
    • Discuss
  • 5. If f(t) = A d(t - a), F(s) is

  • Options
  • A. A e-as
  • B. A eas
  • C. A a e-as
  • D. Aa eas
    • Discuss
  • 6. If Electronics and Communication Engineering Signals and Systems: If then for this to be then for this to be true x(t) is

  • Options
  • A. exp (j2p f/t)
  • B. exp (-j2p f/t)
  • C. exp (j2p ft)
  • D. exp (-j2p f/t)
    • Discuss
  • 7. A voltage V(t) is a Gaussian ergodic random process with a mean of zero and a variance of 4 volt2. If it is measured by a dc meter. The reading will be

  • Options
  • A. 0
  • B. 4
  • C. 2
  • D. 2
    • Discuss
  • 8. ?(t) is a

  • Options
  • A. energy signal
  • B. power signal
  • C. neither energy nor power
  • D. none
    • Discuss
  • 9. Which one most appropriate dynamic system?

  • Options
  • A. y(n) + y(n - 1) + y(n + 1)
  • B. y(n) + y(n - 1)
  • C. y(n) = x(n)
  • D. y(n) + y(n - 1) + y(n + 3) = 0
    • Discuss
  • 10. Inverse Laplace transform of Electronics and Communication Engineering Signals and Systems: Inverse Laplace transform of is

  • Options
  • A. 2 exp (- 2.5 t) cosh (0.5 t)
  • B. exp (- 2 t) + exp (- 3 t)
  • C. 2 exp (- 2.5 t) sinh (0.5 t)
  • D. 2 exp (- 2.5 t) cos 0.5 t
    • Discuss

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