microwave-communication electronics-and-communication-engineering question and answers -Page 34

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Microwave Communication problems

1. The p mode of operation of magnetron signifies that
Options
A. the phase difference between adjacent anode poles is p radians
B. the phase difference between adjacent anode poles is a multiple of p radians
C. the total phase shift around the periphery is p radians
D. none of the above

4. Which of the following are true for magic tee in the given figure select the answer as per given codes
1. S₁₃ = S₂₃
2. S₁₄ = S₂₄
3. S₁₂ = 0
4. S₃₄ = 0
Options
A. 1, 2 and 3
B. 1, 2 and 4
C. 2, 3 and 4
D. 1, 3 and 4

7. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)
1. Width of major lobe between nulls of broad side array and end fire array are different.
2. Directive gain of broadside array and end fire array are different.
3. Directive gain of broadside array is 4
Which of the above statements are correct?
Options
A. 1, 2 and 3
B. 1 and 2 only
C. 1 only
D. 1 and 3 only

8. If a microstrip is enclosed in a metal enclosure
Options
A. the radiation losses are increased
B. the radiation losses are reduced RL
C. the capacitance becomes zero
D. the inductance becomes zero

10. Loading of a line means
Options
A. increasing inductance of line
B. increasing distributed inductance of line
C. decreasing distributed inductance of line
D. decreasing inductance of line

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