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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. Surface impedance at high frequencies is a consideration for

    2. A.
    ferrites
    B.
    semiconductors
    C.
    good conductors
    D.
    dielectrics

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  2. In a uniform plane wave E and H are related by

    3. A.
    E/H = 1
    B.
    E/H = ε/μ
    C.
    E/H = μ/ε
    D.
    none of the above

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  3. Antenna beamwidth is

    4. A.
    measure of directivity
    B.
    measure of angle
    C.
    measure of radiation pattern
    D.
    measure of power pattern

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  4. The pure capacitor connected across an A.C. voltage consumed 20 W. This is due to

    5. A.
    the capacitive reactance in ohms
    B.
    the current flowing in the capacitor
    C.
    the fused capacitor was a big one
    D.
    none of the above

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  5. A dominant wave is characterised by which of the following?

    6. A.
    No attenuation
    B.
    Lowest cut off wavelength
    C.
    Highest cut off wavelength
    D.
    All of the above

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  6. The cut off wavelength λc for TE20 mode for a standard rectangles waveguide is

    7. A.
    2/a
    B.
    2a
    C.
    a
    D.
    2a2

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  7. F2 layer of atmosphere extends from

    8. A.
    250 km to 400 km
    B.
    150 km to 250 km
    C.
    50 km to 150 km
    D.
    15 km to 50 km

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  8. Whereas resonant antenna is bidirectional, non-resonant antenna is unidirectional.

    9. A.
    True
    B.
    False

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  9. In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

    10. A.
    1
    B.
    2
    C.
    22
    D.
    4

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  10. Which of the following antennas is λ /4 length?

    11. A.
    Dipole
    B.
    Marconi
    C.
    Monopole
    D.
    Parabolic

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