For a short wave radio link between two stations via the ionosphere. The ratio of the maximum usable frequency to the critical frequency

May be less than or more than 1 depending on the distance between the two stations

Does not depend on the distance between the two stations

For a short wave radio link between two stations via the ionosphere. T

1.	For a short wave radio link between two stations via the ionosphere. The ratio of the maximum usable frequency to the critical frequency
A.	Is always less than 1
B.	Is always greater than 1
C.	May be less than or more than 1 depending on the distance between the two stations
D.	Does not depend on the distance between the two stations
Answer» C. May be less than or more than 1 depending on the distance between the two stations

Discussion

No Comment Found

Related MCQs

Consider two fields E = 120 cos (106 t x) ay V/m and H = A cos (106 t x) az A/m The values of A and which will satisfy the Maxwell's equation in a linear isotropic homogeneous lossless medium with r = 8 and r = 2 will be <table width="400px" border="0"><tr><td>A (in A/m)</td><td> (in rad/m)</td></tr><tr><td>A. 1</td><td>0.0105</td></tr><tr><td>B. 1</td><td>0.042</td></tr><tr><td>C. 2</td><td>0.0105</td></tr><tr><td>D. 2</td><td>0.042</td></tr></table>
A plane wave is characterised by this wave is <table><tr><td> </td><td></td><td>^</td><td>^</td></tr> <tr><td> E = </td><td>(0.5</td> <td>x +</td><td>x</td><td>Ej /2)</td><td>ej t jk2</td></tr></table>
The phase velocity for the TE10 mode in an air filled rectangular waveguide is
A material has conductivity of 10 2 mho/m and a relative permittivity of 4 the frequency at which conduction current in the medium is equal to the displacement current is
The dominant mode in a rectangular waveguide is TE10 because this mode has
8-point charges of 1 nc each are located at the corners of a cube in free space that is 1 m on a side, then E at the centre is
If a plane electromagnetic wave satisfies the equation <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 2Ex</center></td><td rowspan="2"> = e2</td> <td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> 2Ex</center></td></tr><tr><td style="text-align: center;"> z2</td><td style="text-align: center;"> t2</td></tr></table> the wave propagates in
A stub having load impedance ZL and stub length / 2 then input impedance Zin is
A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with r = 4. The reflection co-efficient for the normal incidence is
A uniform place wave in air impinges at 45 angle on a lossless dielectric material with dielectric constant r. The transmitted wave propagate in a 30 direction with respect to the normal the wave of r is

For a short wave radio link between two stations via the ionosphere. The ratio of the maximum usable frequency to the critical frequency

Discussion

No Comment Found

Related MCQs

Reply to Comment