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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Q. In 8 cavity magnetron the π mode corresponds to a total phase shift equal to

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Q. Satellite communication systems use the frequency band

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Q. The characteristic impedance of a cable is about

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Q. A TR (transmitter receiver) tube has

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Q. A microwave connector should have high SWR.

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Q. Assertion (A): A small section of high impedance line is equivalent to a series inductance.

Reason (R): A small section of a low impedance line is equivalent to a series resistance.

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Q. Assertion (A): Bolometer is frequently used in microwave power measurement.

Reason (R): In a bolometer the input microwave power causes a change in resistance.

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Q. The radiation resistance of a doublet antenna of length dl is proportional to

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Q. Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

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Q. The usable bandwidth of ridge wave guide

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