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ECE :: Electromagnetic Field Thoery

  1. Which of the following statement is false?

  2. A.
    A half-wave dipole is a resonant antenna
    B.
    A horizontal antenna transmits radio signal with horizontal polarization
    C.
    The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long
    D.
    All of the above

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  3. The useful magnetic flux obtainable from any closed surface is

  4. A.
    unity
    B.
    constant
    C.
    both (a) and (b)
    D.
    none of the above

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  5. The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.

  6. A.
    True
    B.
    False

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  7. The equation ∇ . J = 0 is called

  8. A.
    Poisson's equation
    B.
    Kirchoff's node equation
    C.
    Continuity equation for static currents
    D.
    Continuity equation for sampling currents

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  9. It is best to use for coupling a coaxial line to a parallel wire transmission line.

  10. A.
    directional Coupler
    B.
    balun
    C.
    slotted line
    D.
    tee

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  11. In H-plane metal plate lens the travelling wave front is

  12. A.
    totally retarded
    B.
    retarded
    C.
    accelerated
    D.
    neither accelerated nor retarded

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  13. MUF is depend upon

  14. A.
    electron density of the ionospheric layer
    B.
    11 year sun spot cycle
    C.
    received frequency by receiver
    D.
    height of ionospheric layer

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  15. In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

  16. A.
    transmission efficiency
    B.
    front to back ratio
    C.
    loss coefficient
    D.
    none of the above

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  17. Which of the following is not between F2 layer and D layer?

  18. A.
    E layer
    B.
    F1 layer
    C.
    G region
    D.
    All of the above

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  19. The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

  20. A.
    null
    B.
    circle
    C.
    figure of eight
    D.
    none of the above

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