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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. A transmission line has primary constants R, L, G and C and secondary constant z0 and γ = (a + Jβ). If the line is loss less, then

    2. A.
    R = 0, G ≠ 0, and a = 0
    B.
    R = 0, G = a, 0 and β = |r|
    C.
    G = 0, a = β
    D.
    R = 0, G = 0, a = 0, β = |r|

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  2. Which of the following is multiband HF receiving antenna?

    3. A.
    Square loop
    B.
    Log-periodic
    C.
    Conical horn
    D.
    Folded dipole

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  3. A rectangular waveguide is a

    4. A.
    rectangular conducting wire to propagate electromagnetic waves
    B.
    hollow rectangular walled room carrying electromagnetic wave
    C.
    hollow rectangular conducting tube through which electromagnetic waves can be propagated
    D.
    tube antenna to transmit and receive electromagnetic waves

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  4. If a and b are the dimensions of waveguide then

    5. A.
    a = 3b
    B.
    a = 2b
    C.
    a = b
    D.
    a = b/4

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  5. The frequency range for satellite communication is

    6. A.
    3 to 30 kHz
    B.
    300 to 3000 kHz
    C.
    3000 to 30000 MHz
    D.
    30000 to 300000 MHz

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  6. A λ/8 section of transmission line is determined of load impedance of (2 - j 5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

    7. A.
    10 Ω
    B.
    (6.9 + j 7.24) Ω
    C.
    (1.75 + j 3.098) Ω
    D.
    (2 - j 5) Ω

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  7. Long distance short wave radio broadcasting based on

    8. A.
    line of sight
    B.
    ionospheric wave
    C.
    ground wave
    D.
    skywave

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  8. Many circles are drawn in a Smith chart used for transmission line calculations. The circle shown in the figure represents

    9. A.
    unit circles
    B.
    constant resistance circles
    C.
    constant reactance circles
    D.
    constant reflection coefficient circles

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  9. A loop antenna is a commonly used for

    10. A.
    radar
    B.
    direction finding
    C.
    satellite communication
    D.
    all of the above

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  10. For transmission line load matching over a range of frequencies, it is best to use a

    11. A.
    double stub
    B.
    balun
    C.
    single stub of adjustable position
    D.
    broadband directional coupler

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