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ECE :: Microwave Communication

  1. In a coaxial line

  2. A.
    the characteristic impedance is less than that of two wire line
    B.
    the wave velocity is less than that of two wire line
    C.
    both (a) and (b)
    D.
    neither (a) nor (b)

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  3. If a and b are the width and height of rectangular wave-guide the cut off wavelength λc for TE20 mode is equal to

  4. A.
    a
    B.
    a + b
    C.
    a - b
    D.
    a2 + b2

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  5. A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be

  6. A.
    minimum and maximum
    B.
    minimum and minimum
    C.
    maximum and minimum
    D.
    maximum and maximum

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  7. The scattering matrix of magic tee is

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  9. Frequency range for satellite communication is

  10. A.
    1 kHz to 100 kHz
    B.
    100 kHz to 10 MHz
    C.
    10 MHz to 100 MHz
    D.
    1 GHz to 30 GHz

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  11. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.

  12. A.
    True
    B.
    False

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  13. VSWR = Emax/Emin.

  14. A.
    True
    B.
    False

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  15. Power monitor and reflectometer use the principle of

  16. A.
    directional coupler
    B.
    klystron amplifier
    C.
    Gunn diode
    D.
    TWT

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  17. A line slightly longer than length and short circuited at far end behaves as

  18. A.
    an inductance
    B.
    a capacitance
    C.
    L and C in series
    D.
    L and C in parallel

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  19. Compared to coaxial lines, the advantages of wave guides are

  20. A.
    higher power handling capacity
    B.
    lower loss per unit length
    C.
    cheaper and simple mechanical structure
    D.
    all of the above

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