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ECE :: Microwave Communication

Microwave Communication - Section 1
Microwave Communication - Section 2
Microwave Communication - Section 3
Microwave Communication - Section 4
Microwave Communication - Section 5
Microwave Communication - Section 6
Microwave Communication - Section 7
Microwave Communication - Section 8

  1. The velocity factor of a transmission line depends on

    2. A.
    temperature
    B.
    skin effect
    C.
    relative permittivity of dielectric
    D.
    none of the above

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  2. A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is

    3. A.
    10
    B.
    2
    C.
    1
    D.
    infinity

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  3. In a klystron amplifier the input cavity is called

    4. A.
    buncher
    B.
    catcher
    C.
    Pierce gun
    D.
    collector

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  4. In a circular waveguide the dominant mode is

    5. A.
    TE01
    B.
    TE11
    C.
    TE20
    D.
    TE21

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  5. The reflection coefficient on a line is 0.2 ∠45°. The SWR is

    6. A.
    0.8
    B.
    1.1
    C.
    1.2
    D.
    1.5

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  6. Microwave resonators are used in

    7. A.
    microwave oscillators
    B.
    microwave narrow band amplifier
    C.
    microwave frequency metres
    D.
    all of the above

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  7. Assertion (A): TWT uses a focussing mechanism to prevent the electron beam from spreading.

    Reason (R): In a TWT the electron beam has to travel a much longer distance than in klystron.

    8. 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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  8. In a TWT the amplitude of resultant wave travelling down the helix

    9. A.
    increases exponentially
    B.
    increases linearly
    C.
    decreases exponentially
    D.
    is almost constant

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  9. Which of the following is not a travelling wave?

    10. A.
    e = Em sin (βx - ωt)
    B.
    e = Em cos (βx - ωt)
    C.
    e = Em sin (ωt - βx)
    D.
    e = Em sin (βx)

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  10. Both Impatt and Trapatt devices use avalanche effect

    11. A.
    True
    B.
    False

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