Menu
Home / ECE / Electromagnetic Field Thoery :: Section 3

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. The ratio of the directivity of an end fire antenna to that of a broadside antenna is

    2. A.
    2
    B.
    3
    C.
    4
    D.
    5

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by
    E(z, t) = 10 cos (2p x 107t - 0.1 pz) volt/metre, then the velocity of the travelling wave is

    3. A.
    3.0 x 108 m/sec
    B.
    2 x 108 m/sec
    C.
    6.28 x 107 m/sec
    D.
    2 x 107 m/sec

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. The absorption of radio waves by atmosphere depends on

    4. A.
    their frequency
    B.
    their distance from the transmitter
    C.
    the polarization of atmosphere
    D.
    the polarization of the waves

    View Answer

    Workspace

    Discuss Discuss in Forum

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

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

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. Microwave signals transmitted towards the sky are

    6. A.
    strongly absorbed by the ionosphere
    B.
    strongly reflected by the ionosphere
    C.
    transmitted through the ionosphere
    D.
    unable to reach the ionosphere because of strong absorption in the lower atmosphere

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. Radiation intensity does not depend upon

    7. A.
    the antenna direction
    B.
    antenna width
    C.
    both (a) and (b)
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. Δ2V = - r/E is known as __________ equation

    8. A.
    Poisson
    B.
    Fourier
    C.
    Laplace
    D.
    Maxwell

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. A vertical earthed antenna is resonant when its physical height is equal to

    9. A.
    λ
    B.
    C.
    D.

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. Which of the following is a vector quantity?

    10. A.
    Standing wave ratio
    B.
    Reflection coefficient
    C.
    Gain
    D.
    All of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. The L/C has the dimension of

    11. A.
    time
    B.
    capacitance
    C.
    velocity
    D.
    resistance

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers