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Microwave Communication problems

1. Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is
Options
A. 8, 4, 2, 2, 0 mW
B. 0, 8, 4, 4, 0 mW
C. 0, 8, 2, 2, mW
D. 8, 2, 4, 2, 0 mW

2. In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to
Options
A. one pole/cycle
B. two pole/cycle
C. four pole/cycle
D. six pole/cycle

4. Assertion (A): In rectangular waveguide TE₀₁ mode is just TE₁₀ mode rotated by 90�.
Reason (R): When a rectangular waveguide is rotated by 90�, the broad and narrow dimensions get interchanged.
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

5. In microwave system, waveguide twists
Options
A. change the plane of polarization of a propagating wave
B. change the direction of a propagating wave
C. change the mode of a propagating wave
D. both (b) and (c)

6. In TE₁₀mode the largest electric field in a rectangular wave guide, occurs
Options
A. along centre line of broad wall (i.e. x = a/2)
B. along the broad wall (i.e. x = 0 and x = a)
C. either (a) or (b)
D. neither (a) nor (b)

7. TM₀₁ mode in circular waveguide is analogous to
Options
A. TM₁₀ mode in square waveguide
B. TM₁₁ mode in square waveguide
C. TM₂₀ mode in square waveguide
D. TM₀₂ mode in square waveguide

10. In a shield helix
Options
A. the spacing between adjacent turns is very large
B. the spacing between adjacent turns approaches zero
C. the spacing between adjacent turns approaches zero and wire thickness approaches zero
D. the spacing between adjacent turns is very large wire thickness approaches zero

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