Q. A directional coupler is used

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Q. 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.

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Q. Consider the following statements about a magic tee

1. The collinear arms are isolated from each other.
2. On of the collinear arms is isolated from E arm.
3. On of the collinear arms is isolated from H arm.
4. E and H arms are isolated from each other.

Of the above statements

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Q. Assertion (A): Hollow waveguides are frequently used as transmission lines at microwave frequencies.

Reason (R): Waveguide has high power handling capacity, low loss and simple structure.

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Q. In π mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to

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Q. In rectangular waveguides the ratio of width to height is about

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Q. Which of these statements is correct?

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Q. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length λc)

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Q. Ridge waveguide is essentially a form of capacitively loaded guide.

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Q. In a rectangular waveguide

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Q. Which of the following modes cannot exist in rectangular resonant cavity?

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Q. In a Gunn diode oscillator drift velocity of electron is 10⁷ cm/s and active region length is 10 x 10‾⁴ cm. The natural frequency of oscillation is

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Q. Assertion (A): An artificial transmission line can be used as a pulse generator.

Reason (R): A pulse function is used very frequently in network analysis.

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Q. Consider the following statements about hybrid ring

1. Ports 1 and 2 are decoupled.
2. Port 3 and 4 are coupled.
3. A signal entering either port 1 or 2 splits equally between ports 3 and 4.
4. A signal entering either port 3 or 4 splits equally between ports 1 and 2.

Which of the above are correct?

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Q. TM₀₁ mode in circular waveguide is analogous to

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Q. In microwave system, waveguide twists

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Q. A 'rat race' is a

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Q. Compared to coaxial lines, the advantages of wave guides are

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Q. Standard mismatches are used to calibrate SWR and impedance measuring equipments.

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Q. As compared to LED, LASER has

1. higher emission efficiency
2. no tuning arrangement
3. narrow spectral width
4. provision for confinement

Of these statements

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