Menu
Home / ECE / Electromagnetic Field Thoery :: Section 11

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. Which of the following is abnormal variation in ionosphere?

    2. A.
    Diurnal variation
    B.
    Seasonal variation
    C.
    Ionospheric storms
    D.
    None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. Laplace equation in cylindrical co-ordinates is given by

    3. View Answer

    Workspace

    Discuss Discuss in Forum

  3. Troposphere is the upper part of the Earth's atmosphere which absorbs large quantities of Sun's radiations.

    4. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. For resonant long wire antenna 'n' half wavelength long in free space, if 'n' is increased then inclination of the major lobe with wire axis will __________ .

    5. A.
    increases
    B.
    decreases
    C.
    remains same
    D.
    none

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. The maximum effective aperture of λ/2 (half-wave) antenna is

    6. A.
    0.013 λ2
    B.
    0.13 λ2
    C.
    1.3 λ2
    D.
    13 λ2

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. Zoning is used with a dielectric antenna in order to

    7. A.
    permit pin-point focusing
    B.
    reduce the bulk of the lens
    C.
    increase the bandwidth of the lens
    D.
    correct the curvature of the wavefront from a horn that is too short

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. For aeroplane and navigation frequency band is

    8. A.
    VLF
    B.
    UHF
    C.
    VHF
    D.
    EHF

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. Poynting vector signifies which of the following?

    9. A.
    Power density vector producing electrostatic field
    B.
    Power density vector producing electromagnetic field
    C.
    Current density vector producing electrostatic field
    D.
    Current density vector producing electromagnetic field

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. Which one is correct?

    10. A.
    Sky wave propagation (2 to 30 MHz)
    B.
    Space wave propagation (> 30 MHz)
    C.
    Tropospheric propagation (> 300 MHz)
    D.
    All of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. When a magnetic circuit is compared with an electric circuit, the equivalent of the magnetic flux is

    11. A.
    the conductivity of the lines
    B.
    the voltage of the source
    C.
    the current in the lines
    D.
    the conductance of the load

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers