Q. Antenna commonly used for microwave links are

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Q. If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is

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Q. Electric lines of force do not cross each other because

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Q. A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?

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Q. For free space propagation

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Q. SHF range is

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Q. The measure of mismatch between the load and the transmission line is known as

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Q. Ionospheric storm causes an abnormal decrease in the critical frequency.

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Q. Which of the following is best excited from a waveguide?

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Q. The frequencies in ultra high frequency range are propagated by means of __________ waves

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Q. For an ideal antenna, numerical value of directivity must be

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Q. The force in a magnetic field is given by F = qvB

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Q. An electromagnetic wave is incident normally on a dielectric boundary. It is

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Q. According to maximum power transfer theorem, if the load is inductive, the source should be

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Q. According to Siegel and Labus, antenna can be treated as

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Q. Which of the following waves do not exist in waveguides?

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Q. The bidirectional pattern of a broadside array can be converted into unidirectional by

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Q. VLF waves are used for communication system because

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Q. The value of susceptibility in case of vacuum is taken as

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Q. Self impedance is

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