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Home Electronics and Communication Engineering Electromagnetic Field Theory Comments

  • Question
  • Consider a 300 ?, quarter wave long at 1 GHz transmission line as shown in figure. It is connected to a 10 V, 50 ? source at one end is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is
    Consider a 300 ?, quarter wave long at 1 GHz transmission line as shown in figure. It is connected t


  • Options
  • A. 10 V
  • B. 5 V
  • C. 60 V
  • D. 60/7 volt

  • Correct Answer
  • 10 V 

    Explanation
    ? = a + j? a = 0 ⟹ ? = j?

    Propagating wave

    v = VI e-rz + VR erz

    No change in the voltage at the open end it will same,

    vr = 10 volt.


    Electromagnetic Field Theory problems


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    • 1. A plane wave is characterized by the wave is

    • Options
    • A. linearly polarized
    • B. circularly polarized
    • C. elliptically polarized
    • D. unpolarized
    • Discuss
    • 2. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

    • Options
    • A. 3 x 108 m/sec
    • B. 5 x 108 m/sec
    • C. 1.5 x 108 m/sec
    • D. 9 x 108 m/sec
    • Discuss
    • 3. For F1 layer the maximum ionic density is 2.3 x 104 electrons per cc. The critical frequency for this layer will be

    • Options
    • A. 1.36 MHz
    • B. 13.6 MHz
    • C. 136 MHz
    • D. 1360 MHz
    • Discuss
    • 4. ZL = 200 ? and it is desired that Zi = 50 ? The quarter wave transformer should have a characteristic impedance of

    • Options
    • A. 100 ?
    • B. 40 ?
    • C. 10000 ?
    • D. 4 ?
    • Discuss
    • 5. The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is

    • Options
    • A. resistive
    • B. inductive
    • C. capacitive
    • D. none of the above
    • Discuss
    • 6. What is the characteristic impedance at 10 MHz?

    • Options
    • A. 547.7 ?
    • B. 54.7 ?
    • C. 5.47 ?
    • D. .547 ?
    • Discuss
    • 7. The displacement flux density at a point on the surface of a perfect conductor is = 2(ax - 3 az)c/m2 pointing away from the surface. The charge density at that point c/m2 will be

    • Options
    • A. 2
    • B. - 2
    • C. 4
    • D. - 4
    • Discuss
    • 8. The velocity of electromagnetic wave in a good conductor is

    • Options
    • A. 3 x 108 m/s
    • B. more than 3 x 108 m/s
    • C. very low
    • D. high
    • Discuss
    • 9. Which one of the following does represents the electric field lines for the TE02 mode in the cross section of a hollow rectangular metallic waveguide?

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 10. A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is

    • Options
    • A. 0°
    • B. 30°
    • C. 45°
    • D. 60°
    • Discuss


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