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ECE :: Microwave Communication

  1. A coaxial RF cable has a characteristic impedance of 50 Ω and C equal to 40 pF/m. The inductance is

  2. A.
    1 μ H/m
    B.
    10 μ H/m
    C.
    0.1 μ H/m
    D.
    0.01 μ H/m

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  3. In a microwave coaxial line, the maximum operating frequency is f max and breakdown strength of dielectric is Ed' Then maximum power handling capacity is proportional to

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  5. To couple a coaxial line to a parallel wire line it is best to use

  6. A.
    slotted line
    B.
    balun
    C.
    directional coupler
    D.
    λ/4 transformer

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  7. In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity

  8. A.
    True
    B.
    False

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  9. If VSWR is infinite, the transmission line is terminated in

  10. A.
    short circuit
    B.
    complex impedance
    C.
    open circuit
    D.
    either (a) or (c)

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  11. In a circular waveguide TE21 mode has lowest cutoff frequency

  12. A.
    True
    B.
    False

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  13. The number of TV channels which can be accommodated in a spectrum of 300 MHz is about

  14. A.
    5
    B.
    10
    C.
    50
    D.
    200

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  15. The noise figure of multicavity klystron amplifier is very low

  16. A.
    True
    B.
    False

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  17. Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.

    Reason (R): Free space has an intrinsic impedance of 377 ohms.

  18. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

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  19. In the given figure the E and H lines in a coaxial cable

  20. A.
    The radial lines are E lines and circular lines are H lines
    B.
    Radial lines are H lines and circular lines are E lines
    C.
    The directions of E and H lines are wrong
    D.
    Radial lines may be E and H lines depending an direction of current

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