# Electromagnetic Field Theory

• ## In a perfect conductor the incident and reflected wave combine to produce_____.

• A. A stronger incident wave
• B. A stronger reflected wave
• C. A standing wave which is not progressing
• D. None of the above
Answer: Option C.
Explanation:

No answer description available for this question

• ## The attenuation in waveguide above to cut off frequency_____.

• A. Very high
• B. Very low
• C. Zero
• D. Infinite
Answer: Option B.
Explanation:

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• ## 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
Answer: Option C.
Explanation:

No answer description available for this question

• ## 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
Answer: Option B.
Explanation:

No answer description available for this question

• ## The minimum height of outer atmosphere is_____.

• A. 100 km
• B. 150 km
• C. 200 km
• D. 400 km
Answer: Option D.
Explanation:

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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
Answer: Option B.
Explanation:

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• ## 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
Answer: Option B.
Explanation:

No answer description available for this question

• ## Tropospheric scatter propagation is not subject to any fading.

• A. True
• B. False
Answer: Option B.
Explanation:

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• ## The critical frequency of ‘F’ layer is greater than 30 MHz.

• A. True
• B. False
Answer: Option B.
Explanation:

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• ## A waveguide operated below cut off frequency can be used as_____.

• A. Phase shifter
• B. An attenuator
• C. An isolator
• D. None
Answer: Option B.
Explanation:

No answer description available for this question

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