Q. Consider the following statements about radar Beacon

1. It is also called transponder.
2. It includes pulse transmitter, receiver and antenna.
3. It replies with full power even when the signal receives is weak.

Which of the above statements are correct?

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Q. Consider the following statements about instrument landing system of aircraft

1. It ensures correct landing under conditions of low visibility.
2. It consists of runaway localizer, glide path equipment and marker beacons.
3. It is basically a blind landing system.

Which of above statements are correct?

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Q. Effect of loading of line is

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Q. Which mode has the minimum cutoff frequency in rectangular wave guides?

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Q. As compared to dimensions of most feeds, the skin depth at microwave frequencies is

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Q. In microwave communication links the fading due to rain occurs. The methods to solve this problem include

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Q. Which of the following is not used as a microwave mixer or detector?

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Q. Integrated fin line can be utilized as a medium for constructing millimeter wave circuits.

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Q. The secondary constants of a line are

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Q. In a loss less line the propagation constant is equal to

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Q. A rectangular wave guide has two stubs each of length λ/4 connected at the source end. The stubs are circuited. Then the stubs present

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Q. Which one of the following is also called 'rat race'?

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Q. Radar principle is used in

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Q. In an optional fiber the refractive index of cladding material should be

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Q. In microwave circuits, a mode transducer is used to

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Q. A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.

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Q. Assertion (A): Inter-digitated geometry is widely used for microwave transistors.

Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.

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Q. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

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Q. Hollow waveguides are used as transmission lines at frequencies

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Q. To ensure that only dominant TE₁₀ mode propagates in a rectangular waveguide, the operating frequency

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