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  • Question

  • The impulse response and the excitation function of a linear time invariant causal system are shown in figure (a) and (b) respectively. The output of the system at t = 2 sec is equal to
    The impulse response and the excitation function of a linear time invariant causal system are shown


  • Options
  • A. 0
  • B. 2
  • C. The impulse response and the excitation function of a linear time invariant causal system are shown
  • D. The impulse response and the excitation function of a linear time invariant causal system are shown

  • Correct Answer
  •  

    Explanation
    The impulse response and the excitation function of a linear time invariant causal system are shown

    The area of the shaded region

    The impulse response and the excitation function of a linear time invariant causal system are shown .

    More questions

    • 1. Tesla is a unit of

    • Options
    • A. flux
    • B. field strength
    • C. flux density
    • D. MMF
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    • 2. In a receiver, which of the following device has IF input but RF output?

    • Options
    • A. Demodulator
    • B. Loudspeaker
    • C. Audio amplifier
    • D. Frequency changer
      • Discuss
    • 3. In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is

    • Options
    • A. 0
    • B. 0.25
    • C. 0.5
    • D. 1
      • Discuss
    • 4. In a shield helix

    • Options
    • A. the spacing between adjacent turns is very large
    • B. the spacing between adjacent turns approaches zero
    • C. the spacing between adjacent turns approaches zero and wire thickness approaches zero
    • D. the spacing between adjacent turns is very large wire thickness approaches zero
      • Discuss
    • 5. Match the following:

      List I List II
      A. 200 MHz 1. SHF
      B. 20 GHz 2. UHF
      C. 500 kHz 3. VHF
      D. 500 MHz 4. MF


    • Options
    • A. A-3, B-1, C-4, D-2
    • B. A-3, B-2, C-4, D-1
    • C. A-3, B-4, C-1, D-2
    • D. A-3, B-4, C-2, D-1
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    • 6. A line of characteristic impedance Z0 branches into two line each with characteristic impedance Z0. The refracted voltage is

    • Options
    • A. zero
    • B. infinite
    • C. equal to incident voltage
    • D. two third of incident voltage
      • Discuss
    • 7. Iron has a body centred cubic structure.

    • Options
    • A. True
    • B. False
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    • 8. A surge voltage

    • Options
    • A. has very high magnitude and very long duration
    • B. has very high magnitude and very small duration
    • C. has very high magnitude and very small duration and can be positive or negative
    • D. can be only positive
      • Discuss
    • 9. The Ohm's law for conduction in metals is

    • Options
    • A. J = ?E
    • B. J =
    • C. J ? ?E
    • D. J ?
      • Discuss
    • 10. The following components are used to measure power output of a 2 kW TWT amplifier

      1. TWT
      2. Low pass/High pass filter
      3. Low power 20 dB attenuator
      4. 40 dB directional coupler with matched load
      5. Power meter.
      The correct sequence of connections of these components is:

    • Options
    • A. 1, 4, 2, 3, 5
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