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ECE :: Microwave Communication

  1. Most electromagnetic transmission in rectangular wave-guide uses

  2. A.
    TE10 mode
    B.
    TE01 mode
    C.
    TE20 mode
    D.
    TE11 mode

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  3. Loading of a line means

  4. A.
    increasing inductance of line
    B.
    increasing distributed inductance of line
    C.
    decreasing distributed inductance of line
    D.
    decreasing inductance of line

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  5. The frequency of oscillations obtained from a reflex klystron depends mainly on

  6. A.
    resonant frequency of cavity
    B.
    repeller voltage
    C.
    voltage of focussing electrode
    D.
    characteristics of cathode

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  7. The main advantage of TWT over klystron is

  8. A.
    higher bandwidth
    B.
    higher gain
    C.
    higher frequency
    D.
    higher output

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  9. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept

  10. A.
    equal to velocity of electron
    B.
    slightly less than velocity of electron
    C.
    slightly more than velocity of electron
    D.
    equal to velocity of light in free space

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  11. Assertion (A): Two equal and opposite travelling waves result in a standing wave.

    Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.

  12. 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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  13. When a wave reaches an open circuit

  14. A.
    the voltage at termination is doubled the incident voltage
    B.
    the current at termination is doubled the incident voltage
    C.
    the voltage at termination is zero
    D.
    both V and I at termination are doubled the incident voltage and current

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  15. Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.

    Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.

  16. 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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  17. Consider the following statements

    1. Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
    2. For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
    3. Ridge wave guide has higher conductor losser than a rectangular waveguide.
    4. Ridge guide has higher conductor losser than a rectangular waveguide.
    Which of the above statements are correct?

  18. A.
    1 and 2 only
    B.
    1, 2 and 3 only
    C.
    2 and 3 only
    D.
    All

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  19. Directive gain of elementary doublet is

  20. A.
    100
    B.
    10
    C.
    1.5
    D.
    0.5

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