Q. Which of the following devices uses a slow wave structure?

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Q. In a turnstile antenna two-half wave resonant wire radiators are placed at 90° to each other in the same plane and are excited

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Q. A waveguide section in a microwave circuit acts as

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Q. In a klystron amplifier dc electron velocity is v₀ and dc electron charge density is ρ₀ the dc beam current is

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Q. Which of the following parameters is negligible in transmission lines?

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Q. The width of a radio beam from a 1 m diameter parabolic antenna at 10 GHz is about

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Q. The diagram to show distance time history of electrons in klystron amplifier is called

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Q. Impedance level of Impatt diodes is generally lower than that of Gunn diodes

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Q. A quarter wave line open circuited at far end behaves as

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Q. Microwave resonators are used in

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Q. Assertion (A): TWT uses a focussing mechanism to prevent the electron beam from spreading.

Reason (R): In a TWT the electron beam has to travel a much longer distance than in klystron.

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

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Q. Which of the following is not a travelling wave?

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Q. Both Impatt and Trapatt devices use avalanche effect

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Q. The directive gain of a transmitting antenna is

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Q. A duplexer is used to

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Q. A branched duplexer requires

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Q. In a backward wave oscillator the wave

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Q. A transmission line has Z0 = 300 Ω and ZL = (300 - j300) ohm. The transmission coefficient is

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Q. In a reflex klystron oscillator, repeller electrode is at

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