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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Q. Microwaves are used for

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Q. In a shield helix

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Q. Dielectric constant and conductivity of rocky soil and flat sandy soil are around

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Q. The main advantage of using micro waves for communications is

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Q. A line of length less than λ/4 and open circuited at far end behaves as

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Q. The beam of a radar should be

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Q. TE₁₀ mode of propagation of electromagnetic energy in waveguides can be thought of as

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Q. Consider the following statement:
SWR of a transmission line is infinite when the load is

1. a short circuit
2. a complex impedance
3. an open circuit
4. a pure reactance

Which of the above statements are correct?

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Q. In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

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Q. In TE₁₀ mode the largest electric field in a rectangular wave guide, occurs

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Q. Which modes of circular wave guides have circular symmetry?

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