Q. A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

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Q. The effective refraction index of the ionosphere for radio wave is

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Q. A medium is said to be isotropic when

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Q. The radiation resistance of a resonant long wire antenna of half wavelength (λ/2) is given

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Q. A uniform wave have components

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Q. The direction in a Yagi Uda antenna

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Q. In cell phone antennas are

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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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