logo

CuriousTab

CuriousTab

Discussion


Home Electronics and Communication Engineering Electromagnetic Field Theory Comments

  • Question
  • A (75 - j 40) W load is connected to a co-axial line of z0 = 75? at 6 MHz. The load matching on the line can be accomplished by connecting


  • Options
  • A. a short circuit stub at the load
  • B. an inductance at the load
  • C. a short circuit stub at a specific distance from the load
  • D. a capacitance at a specific distance from the load

  • Correct Answer
  • an inductance at the load 

    Explanation
    ZL = 75 - J . 40, ZC = 75 W, f = 6 mHz

    Given ZL is capacitive, so proper matching, load must be inductive.


    Electromagnetic Field Theory problems


    Search Results


    • 1. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

    • Options
    • A. 4 cm
    • B. 1 cm
    • C. 2 cm
    • D. 8 cm
    • Discuss
    • 2. A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth

    • Options
    • A. 4°
    • B. 2°
    • C. 10°
    • D. 15°
    • Discuss
    • 3. Calculate the directivity of an antenna for ?E = 30°, ?H = 60

    • Options
    • A. 46
    • B. 23
    • C. 50
    • D. 100
    • Discuss
    • 4. Two identical antennas are placed in the ? = p/2 plane as shown in the figure. The elements have equal amplitude excitation with 180° polarity difference, operating of the far-zone resultant electric field strength normalized with that of a single element, both computed for ? = 0, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 5. A rectangular metal waveguide filled with a dielectric of relative permittivity ?r = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

    • Options
    • A. 2.5 GHz
    • B. 5 GHz
    • C. 10 GHz
    • D. 12.5 GHz
    • Discuss
    • 6. The electric field of the incident wave is , where ? = 3 x 109p and ? = 10 p. The electric field of the transmitted wave Et is given by

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 7. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ?0. The surface charge density on the conductor is ((?0 = 10-9/36p)F/m)

    • Options
    • A. 0 c/m2
    • B. 2 c/m2
    • C. 1.8 x 10-11 c/m2
    • D. 1.14 x 10-9 c/m2
    • Discuss
    • 8. The phase angle corresponding to ?/4 in a standing-wave pattern is

    • Options
    • A. 30°
    • B. 90°
    • C. 135°
    • D. 180°
    • Discuss
    • 9. Which one of the following potential does not satisfy Laplace's equations?

    • Options
    • A. v = 10 xy
    • B. v = p cos ?
    • C.
    • D. v = f cos ? + 10
    • Discuss
    • 10. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is

    • Options
    • A.
    • B.
    • C.
    • D. 20p2
    • Discuss


    Comments

    There are no comments.

Enter a new Comment