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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. In figure the voltage distribution on a vertical earthed antenna is represented by

    2. A.
    curve A
    B.
    curve B
    C.
    curve C
    D.
    curve D

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  2. The direction in a Yagi Uda antenna

    3. A.
    is longer than the radiating element
    B.
    is shorter than the radiating element
    C.
    can be longer or shorter than the radiating element
    D.
    does not exist

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  3. In cell phone antennas are

    4. A.
    monopole
    B.
    loops
    C.
    helical
    D.
    lens

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  4. Antenna commonly used for microwave links are

    5. A.
    loop antennas
    B.
    log periodic antennas
    C.
    paraboloidal dishes
    D.
    rhombic antennas

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  5. For a good conducting medium the intrinsic impedance is

    6. A.
    σωμ ∠p/2
    B.
    ωμ /σ ∠45°
    C.
    ωμ/σ ∠p/2
    D.
    ωμ/σ ∠0°

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  6. The force in a magnetic field is given by F = qvB

    7. A.
    F and q are perpendicular and v and B are perpendicular
    B.
    F and q only are perpendicular to each other
    C.
    F and v, F and B are mutually perpendicular to each other and v and B at any angle between them
    D.
    All the four components are perpendicular to each other

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  7. An electromagnetic wave is incident normally on a dielectric boundary. It is

    8. A.
    totally reflected
    B.
    partially reflected and partially refracted
    C.
    totally absorbed
    D.
    none of the above

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  8. According to maximum power transfer theorem, if the load is inductive, the source should be

    9. A.
    inductive
    B.
    capacitive
    C.
    resistive
    D.
    any of the above

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  9. According to Siegel and Labus, antenna can be treated as

    10. A.
    closed transmission line
    B.
    shorted transmission line
    C.
    earthed transmission line
    D.
    opened-out transmission line

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  10. Given figure shows a 90° sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region

    11. A.
    VD
    B.
    DF
    C.
    EF
    D.
    EC

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