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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Q. For a directional coupler the power is in the ratio of

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Q. As regards rectangular and circular waveguides

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Q. In a high frequency coaxial line and the length of line characteristic impedance is a function of

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Q. Assertion (A): In TE₁₀ mode the cutoff frequency of rectangular waveguide is c/2a, where a is the broad dimension and c is velocity of light.

Reason (R): TE₁₀ mode is the dominant mode in rectangular waveguide.

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Q. In which of the following devices can the operation be visualised in terms of a series feedback loops?

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Q. The first and second subscripts in models of circular waveguides depict

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Q. In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?

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Q. In which mode of rectangular waveguide are all field components zero?

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Q. A microstrip line has dielectric having relative permittivity ∈r. The effective dielectric constant is

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Q. Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.

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Q. The noise figure of klystron amplifier is about

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Q. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a

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