Directive gain of elementary doublet is 100 10 1.5 0.5

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Microwave Communication problems

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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

2. Assertion (A): In a power divider S_H = 0, S₂₁ = 0.707 = S₃,
Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

3. Wave guides are pressurised above normal atmospheric pressure for
Options
A. increasing the power handling capacity
B. improving conductivity of walls
C. preventing higher modes from propagation
D. varying the wave impedance

4. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
Options
A. TM₁₂
B. TE₁₃
C. TE₂₁
D. TM₂₅

5. When a wave reaches an open circuit
Options
A. the voltage at termination is doubled the incident voltage
B. the current at termination is doubled the incident voltage
C. the voltage at termination is zero
D. both V and I at termination are doubled the incident voltage and current

7. 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

10. 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

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