Q. A directional coupler is used to determine

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Q. For air filled circular waveguides

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Q. A short circuited stub is preferred to an open circuited stub because an open circuited stub

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Q. If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of

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Q. Radar is essentially an echo ranging system

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Q. In Gunn diode electrons are transferred from

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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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