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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 TEM wave incident obliquely on a dielectric boundary with εr1 = 2 and εr2 = 1, the angle of incidence for total reflection is

    2. A.
    30°
    B.
    60°
    C.
    45°
    D.
    90°

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  2. The total field produced by an antenna array system at a distance from it is

    3. A.
    sum of the field produced by the individual antennas of the array system
    B.
    directional gain of antenna
    C.
    linear antenna gain
    D.
    vector sum of the field produced by the individual antennas of the array system

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  3. A perfect conductor is a perfect absorber of electromagnetic waves.

    4. A.
    True
    B.
    False

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  4. In a lead acid cell the density of the acid gives an indication of

    5. A.
    the level of the acid
    B.
    the eventual damages caused to the plates
    C.
    the charge of the battery
    D.
    the e.m.f. of the battery

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  5. A (0.75 - j50) ohm load is connected to a coaxial transmission line of Z0 = 75 ohms at a frequency of 10 GHz Which of the following will be the best method of matching?

    6. A.
    Connecting an inductance at the end
    B.
    Connecting a short circuited stub at the load
    C.
    Connecting a capacitance at some distance from the load
    D.
    Connecting a short circuited stub at some specified distance from the load

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  6. Ground wave propagation is useful for

    7. A.
    microwave
    B.
    medium wave
    C.
    short wave
    D.
    long distance

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  7. Radiowaves are electromagnetic waves having frequency range

    8. A.
    0.001 to 50 H
    B.
    0.001 to 50 kHz
    C.
    0.002 to 50 MHz
    D.
    0.001 to 1016 Hz

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  8. When a line of any odd multiple of a quarter wavelength is short-circuited it represents

    9. A.
    unit impedance
    B.
    infinite impedance
    C.
    zero impedance
    D.
    none of the above

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  9. An antenna is considered to be in free space where its height above the ground is

    10. A.
    λ
    B.
    2λ
    C.
    less than 3λ
    D.
    more than 5λ

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  10. In waveguide Degenerate modes are

    11. A.
    two mode having same cut off frequency
    B.
    two mode having same power
    C.
    two mode having same phase velocity
    D.
    it is a hypothetical mode

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