Q. A square waveguide carries TE₁₁ mode whose axial magnetic field is given by following equation, where the guide dimensions are in cms. The cut off frequency of the mode is

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Q. In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is

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Q. In the given figure the line voltage after a number of reflections will be

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Q. In directional coupler of the given figure, the terms |S₁₄| and |S₂₃| of scattering matrix are nearly

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

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Q. If ρv is reflection coefficient and VSWR is voltage standing wave ratio, then

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Q. In terms of R, L, G and C the propagation constant γ of a transmission line is

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Q. In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of line is

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Q. 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

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Q. The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is

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Q. If wavelength in free space is λ₀ wavelength in insulator λ, μr is relative permittivity or insulator and ∈r is relative permittivity or insulator, then

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Q. In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is

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Q. The scattering matrix of magic tee is

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Q. Guide wavelength (λg), cutoff wavelength (λc) and free space wavelength (λ₀) of a waveguide are related as

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Q. Consider the following statements about directional coupler shown in the figure:

1. Ports 1 and 2 are decouple
2. Ports 3 and 4 are decoupled
3. Pots 1 and 3 are decoupled
4. Ports 1 and 4 are decoupled

Which of the above statements are correct?

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Q. 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

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Q. If QL is loaded Q, QE is external Q and QU is unloaded Q of a microwave resonator, then

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Q. Which of the following lines is non-radiating?

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Q. Assertion (A): The impedance of a matched load is equal to characteristic impedance of line.

Reason (R): A matched termination absorbs all the power incident on it.

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Q. Skin effect is more pronounced at high frequencies.

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