What is the characteristic impedance at 10 MHz? 547.7 ? 54.7 ? 5.47 ? .547 ? , n

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Question
What is the characteristic impedance at 10 MHz?
Options
A. 547.7 ?
B. 54.7 ?
C. 5.47 ?
D. .547 ?

Correct Answer

547.7 ?

Explanation

What is the characteristic impedance at 10 MHz? 547.7 ? 54.7 ? 5.47 ? .547 ? , not depend upon frequ

, not depend upon frequency.

Electromagnetic Field Theory problems

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1. 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
Options
A. 10 V
B. 5 V
C. 60 V
D. 60/7 volt

2. A plane wave is characterized by the wave is
Options
A. linearly polarized
B. circularly polarized
C. elliptically polarized
D. unpolarized

3. 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

4. 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

5. Z_L = 200 ? and it is desired that Z_i = 50 ? The quarter wave transformer should have a characteristic impedance of
Options
A. 100 ?
B. 40 ?
C. 10000 ?
D. 4 ?

6. The displacement flux density at a point on the surface of a perfect conductor is = 2(a_x - 3 a_z)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

7. 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

8. 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.

9. 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�

10. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
Options
A. 15.9 radians/km
B. 31.8 radians/km
C. 63.6 radians/km
D. 105.4 radians/km

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