Q. A loop antenna is a commonly used for

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

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Q. When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called

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Q. The main disadvantage of the two-hole directional coupler is

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Q. The radiation pattern of a parabola antenna is

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Q. The Q of a resonant transmission line is

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Q. In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include

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Q. The static electric field in a conductor is

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Q. In a perfect conductor the incident and reflected wave combine to produce

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Q. MUF is highest in periods of greatest sunspot activity.

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Q. Which of the following impedance inversion is obtained?

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Q. In case of surface waves the field strength at a point is directly proportional to

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Q. Which of the following statement is false?

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Q. Whenever a wave is incident on a perfect conductor then the reflection coefficient is

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Q. When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

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Q. Radiation intensity in a given direction is the

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Q. The critical frequency of 'F' layer is greater than 30 MHz.

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Q. Which of the following statement is incorrect?

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Q. Which of the following will increase the antenna radiation efficiency?

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Q. A waveguide operated below cut off frequency can be used as

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