- A. A stronger incident wave
- B. A stronger reflected wave
- C. A standing wave which is not progressing
- D. None of the above
Electromagnetic Field Theory
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In a perfect conductor the incident and reflected wave combine to produce_____.
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The attenuation in waveguide above to cut off frequency_____.
- A. Very high
- B. Very low
- C. Zero
- D. Infinite
-
MUF is depend upon_____.
- A. Electron density of the ionospheric layer
- B. 11 year sun spot cycle
- C. Received frequency by receiver
- D. Height of ionospheric layer
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According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when_____.
- A. The impedance of one of the networks is half that of the other
- B. The impedance of one is the complex conjugate of the other
- C. The impedance of one is equal to that of the other
- D. None of the above
-
The minimum height of outer atmosphere is_____.
- A. 100 km
- B. 150 km
- C. 200 km
- D. 400 km
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In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as_____.
- A. Transmission efficiency
- B. Front to back ratio
- C. Loss coefficient
- D. None of the above
-
The main disadvantage of the two-hole directional coupler is_____.
- A. Poor directivity
- B. Narrow bandwidth
- C. High standing wave ratio
- D. Low directional coupling
-
Tropospheric scatter propagation is not subject to any fading.
- A. True
- B. False
-
The critical frequency of ‘F’ layer is greater than 30 MHz.
- A. True
- B. False
-
A waveguide operated below cut off frequency can be used as_____.
- A. Phase shifter
- B. An attenuator
- C. An isolator
- D. None