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ECE :: Electromagnetic Field Thoery

  1. For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

  2. A.
    elliptically polarized
    B.
    linearly polarized
    C.
    right circularly polarized
    D.
    left circularly polarized

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  3. The phase velocity in a transmission line is

  4. A.
    B.
    v = LC
    C.
    v = LC
    D.

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  5. Which of the antenna is best excited by a waveguide?

  6. A.
    Horn
    B.
    Discone
    C.
    Helical
    D.
    Biconical

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  7. An end fire array consisting of several half-wave lengths of directive gain 40, then array length will be

  8. A.
    10 λ
    B.
    100 λ
    C.
    20 λ
    D.
    5 λ

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  9. Loop antennas are mostly employed for direction finding (DF) purposes because they are small and hence portable.

  10. A.
    True
    B.
    False

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  11. The troposphere extends from earth surface to a height of

  12. A.
    15 km
    B.
    90 km
    C.
    150 km
    D.
    200 km

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  13. Antenna reciprocity is put to use in

  14. A.
    radar system
    B.
    commercial broadcast
    C.
    TV broadcast system
    D.
    none of the above

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  15. The length of a λ/2 antenna in feet is given by the relation

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  17. For satellite communication, the frequency should be

  18. A.
    equal to the critical frequency
    B.
    more than the critical frequency
    C.
    less than the critical frequency
    D.
    none of these

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  19. The velocity of electromagnetic wave in free space is given by

  20. A.
    μ00
    B.
    μ0 . ε0
    C.
    D.
    ε00

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