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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. Two LOS antennas having power gains of G1 and G2 are separated transmitted power, Pr is received power turn Pr/Pt will be proportional to

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  2. ∇2 is

    3. A.
    vector
    B.
    scalar
    C.
    depend on direction
    D.
    none

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  3. End fire array has narrow bandwidth.

    4. A.
    True
    B.
    False

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  4. Which of the following antenna is best guided by a waveguide?

    5. A.
    Biconical
    B.
    Horn
    C.
    Helical
    D.
    Dish

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  5. Poynting vector is the rate of energy flow having

    6. A.
    W/m2
    B.
    W-m
    C.
    kWh/s
    D.
    W/m

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  6. Refraction of electromagnetic waves occurs when they

    7. A.
    pass through a small slot in a conducting plane
    B.
    pass into a medium of different dielectric constant
    C.
    are polarized at right angles to the direction of propagation
    D.
    encounter a perfectly conduction surface

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  7. The impedance inversion may be objected with

    8. A.
    a short-circuited stub
    B.
    an open-circuited stub
    C.
    a half-wave line
    D.
    a quarter-wave line

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  8. The force acting on a charge q moving with velocity in a region of electric field and magnetic field is

    9. A.
    r + x
    B.
    q( + x )
    C.
    q( + x )
    D.
    q

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  9. An electromagnetic wave incidents on a perfect insulator at an angle. If the wave is not entirely parallel polarized, then

    10. A.
    the reflected wave will be entirely polarized parallel to the plane of incidence
    B.
    there will be no reflection
    C.
    the reflected wave will be entirely polarized perpendicular to the plane of incidence
    D.
    any of the above

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  10. Coaxial cables can be used for which frequency?

    11. A.
    15 kHz
    B.
    10 MHz
    C.
    200 MHz
    D.
    2000 MHz

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