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ECE :: Electromagnetic Field Thoery

Electromagnetic Field Thoery - Section 1
Electromagnetic Field Thoery - Section 2
Electromagnetic Field Thoery - Section 3
Electromagnetic Field Thoery - Section 4
Electromagnetic Field Thoery - Section 5
Electromagnetic Field Thoery - Section 6
Electromagnetic Field Thoery - Section 7
Electromagnetic Field Thoery - Section 8
Electromagnetic Field Thoery - Section 9
Electromagnetic Field Thoery - Section 10
Electromagnetic Field Thoery - Section 11
Electromagnetic Field Thoery - Section 12
Electromagnetic Field Thoery - Section 13
Electromagnetic Field Thoery - section-14
Electromagnetic Field Thoery - section-15

  1. For space propagation, what will be the electric field strength at receiving antenna

    2. A.
    B.
    30 WTGT
    C.
    173WT
    D.

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  2. A medium is said to be isotropic when

    3. A.
    ∈ = 0
    B.
    ∈ = μ
    C.
    ∈ = σ
    D.
    ∈ is scalar constant

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  3. The radiation resistance of a resonant long wire antenna of half wavelength (λ/2) is given

    4. A.
    73 Ω
    B.
    120 p
    C.
    377 Ω
    D.
    7.3 Ω

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  4. A uniform wave have components

    5. A.
    in the perpendicular direction E existing while H is zero
    B.
    in the direction of propagation E existing while H is zero
    C.
    E and H are zero in direction perpendicular to direction of propagation
    D.
    E and H existing only in direction perpendicular to direction of propagation

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  5. The measure of mismatch between the load and the transmission line is known as

    6. A.
    directivity
    B.
    Gain
    C.
    standing wave ratio
    D.
    reflection coefficient

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  6. Ionospheric storm causes an abnormal decrease in the critical frequency.

    7. A.
    True
    B.
    False

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  7. Which of the following is best excited from a waveguide?

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

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  8. In a vertical earthed antenna the base input impedance will be inductive for a height

    9. A.
    less than
    B.
    between
    C.
    between
    D.
    more than

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  9. The frequencies in ultra high frequency range are propagated by means of __________ waves

    10. A.
    surface
    B.
    ground
    C.
    sky
    D.
    space

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  10. Maximum effective aperture of a antenna is

    11. A.
    1.3 λ2
    B.
    0.13 λ2
    C.
    13 λ2
    D.
    3.1 λ2

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