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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. In a directional coupler

    2. A.
    isolation (dB) equals coupling plus directivity
    B.
    coupling (dB) equals isolation plus directivity
    C.
    directivity (dB) equals isolation plus coupling
    D.
    isolation (dB) equals (coupling) (directivity)

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  2. As the frequency is increased, the charging MVAR in a cable

    3. A.
    decreases
    B.
    increases
    C.
    remain the same
    D.
    decreases or remains the scheme

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  3. Loss angle of a good quality cable is about

    4. A.
    1°
    B.
    30°
    C.
    70°
    D.
    90°

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  4. In a three cavity klystron amplifier, the oscillations are excited in

    5. A.
    input cavity
    B.
    output cavity
    C.
    intermediate cavity
    D.
    both (a) and (b)

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  5. In the given figure reflection coefficient at load is

    6. A.
    0.6
    B.
    - 0.6
    C.
    0.4
    D.
    - 0.4

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  6. Which of the following lines is non-radiating?

    7. A.
    Open two wire
    B.
    Coaxial
    C.
    Both
    D.
    None of the above

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  7. Assertion (A): The impedance of a matched load is equal to characteristic impedance of line.

    Reason (R): A matched termination absorbs all the power incident on it.

    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. Skin effect is more pronounced at high frequencies.

    9. A.
    True
    B.
    False

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  9. Assertion (A): The phenomenon of differential mobility is called transferred electron effect.

    Reason (R): GaAs exhibits transferred electron effect.

    10. 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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  10. Which of the following devices uses a helix?

    11. A.
    Klystron amplifier
    B.
    Klystron oscillator
    C.
    TWT
    D.
    Both (a) and (b)

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