Q. If a line is open circuited Zin = Z0 tanh (gl).

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Q. A reflex klystron oscillator uses

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Q. Which one of the following is not a negative resistance device?

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Q. Microwave links are typically 50 km apart

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Q. For matching over a range of frequencies in a transmission line it is best to use

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Q. Assertion (A): In the interaction region of magnetron an electron is subjected to three forces: force due to electric field, force due to magnetic field and centrifugal force.

Reason (R): The mechanism of generation of microwaves, in a magnetron, involves interaction of electromagnetic fields with electrons moving in static electric and magnetic fields oriented at right angles to each other.

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Q. Which of the following is wrong for a magic used to tee?

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Q. Roughly the time required for microwave cooking as compared to conventional cooking is

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Q. If the minimum range of a radar is to be doubled, the peak power has to be increased by a factor of

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Q. Which mode has the lowest cut off frequency in circular wave guides?

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Q. Assertion (A): Klystron amplifiers use one or more intermediate cavities in addition to buncher and catcher cavity.

Reason (R): When one or more intermediate cavities are used the bandwidth can be increased.

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Q. A wave Em cos (bx - ωt) is a backward wave.

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Q. In a circular waveguide TE₂₁ mode has lowest cutoff frequency

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

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Q. The noise figure of multicavity klystron amplifier is very low

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Q. Assertion (A): The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.

Reason (R): Free space has an intrinsic impedance of 377 ohms.

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Q. A cavity resonator is

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Q. If antenna diameter is increased four times, the maximum range is increased by a factor of

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Q. Assertion (A): Gunn diode is a transferred electron device.

Reason (R): A Gunn oscillator uses the phenomenon of transferred electron effect.

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Q. Atomic and molecular resonance is observed in many substances

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