Q. Varactor diodes use

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Q. A circular waveguide carries TE₁₁ mode whole radial electric field is given by

Er = E₀j₁(r) sin Φ V/m
where r is radial distance in cm from the axis

The cut off wavelength is

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Q. The domain mode in rectangular waveguide is

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Q. The reverse voltage applied to a varactor diode

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Q. To ensure that only dominant mode TE₁₀ is allowed to propagate in an air filled rectangular waveguide, the lower frequency limit and upper frequency limit are

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Q. The skin depth at 1000 MHz as compared to that at 500 MHz is

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Q. The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)

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Q. In a TWT the amplitude of resultant wave travelling down the helix remains constant

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Q. In an infinite line the input impedance at every point is equal to characteristic impedance.

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Q. Consider the following time parameters

1. Domain growth time constant.
2. Transit time.
3. Dielectric relaxation time in positive mobility regime.

Which of the above are used in connection width transferred electron device?

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Q. PIN diode has

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Q. The two terms used to describe performance of a directional coupler are

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Q. The number of PM radio channels which can be accommodated in a spectrum of 300 MHz is about

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Q. Consider the following statements

1. Gunn diode can be used in combinational logic circuits.
2. Gunn diode can be used in sequential logic circuits.
3. Both Gunn diode and GaAs Mesfet can be used in logic circuits.

Which of the above statements are correct?

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Q. Assertion (A): Microstrip is very commonly used in microwave integrated circuits.

Reason (R): Microstrip has an easy access to the top-surface so that active and passive discrete components can be easily mounted.

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Q. When resonant cavities are coupled together the result is

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Q. The path length between ports 1 and 2 for the two waves in a hybrid ring is

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Q. The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is

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Q. As wavelength decrease the size of high directivity antenna

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Q. In a magnetron the magnetic flux density is of the order of

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