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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. An open coil has

    2. A.
    zero resistance and inductance
    B.
    zero resistance and high inductance
    C.
    infinite resistance and zero inductance
    D.
    infinite resistance and normal inductance

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  2. Antenna used for direction finding is

    3. A.
    long dipole
    B.
    parabolic
    C.
    rhombic
    D.
    helical

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  3. In E plane metal plate lens antenna

    4. A.
    travelling wavefronts are retarded
    B.
    travelling wavefront are accelerated
    C.
    travelling wavefront remains unaffected
    D.
    none of the above

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  4. The disturbance from adjacent telephone line is known as

    5. A.
    cross fire
    B.
    cross talk
    C.
    inductive disturbance
    D.
    none of the above

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  5. The boundary conditions at the interface between two dielectrics in an electric field are given by

    6. A.
    Dnormal = 0, Etangential = 0
    B.
    Dnormal = 0, Enormal = 0
    C.
    Dtangential = 0, Etangential = 0
    D.
    Dtangential = 0, Enormal = 0

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  6. The curve representing Ohm's law is

    7. A.
    linear
    B.
    a parabola
    C.
    a hyperbola
    D.
    sine function

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  7. When a plane wave is incident normally from dielectric '1' (μ0, ε1) onto dielectric '2' (μ0, ε2) the electric field of the transmitted wave is 2 times the electric field of the reflected wave. The ratio ε2/ε1 is

    8. A.
    0.5
    B.
    1
    C.
    2
    D.
    4

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  8. The electric intensity for free space is given by

    9. A.
    ε0d
    B.
    σ/ε0
    C.
    σ.ε0
    D.
    d/ε0

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  9. Which of following antenna not produces circular polarisation?

    10. A.
    Helical
    B.
    Parabolic
    C.
    Disc
    D.
    Yagi

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  10. Purpose of antenna is

    11. A.
    to transmit and receive energy
    B.
    to convert EM into electrical
    C.
    to convert electrical into EM
    D.
    all of the above

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