A 3 port circulator is in the given figure. Its scattering matrix is

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Question
A 3 port circulator is in the given figure. Its scattering matrix is
Options
A.
B.
C.
D.

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1. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present
Options
A. an infinite impedance in shunt with line
B. an infinite impedance in series with line
C. a zero impedance in shunt with line
D. a finite impedance in shunt with line

3. The following components are used to measure power output of a 2 kW TWT amplifier
1. TWT
2. Low pass/High pass filter
3. Low power 20 dB attenuator
4. 40 dB directional coupler with matched load
5. Power meter.
The correct sequence of connections of these components is:
Options
A. 1, 4, 2, 3, 5
B. 1, 3, 4, 2, 5
C. 1, 2, 4, 3, 5
D. 1, 4, 3, 2, 5

8. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have
Options
A. reduced losses
B. high bandwidth
C. reduced losses and low bandwidth
D. more losses and low bandwidth

10. Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical.
Reason (R): In a symmetrical matrix S_ij = S_ji.
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

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