Q. A medium of relative permittivity εr2 = 2 forms an interface with free space. A point source of EM energy is located in the medium at a depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross section at the interface is given by

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Q. A transmission line of characteristic impedance z0 = 50 Ω. Phase Velocity = 2 x 10⁸ m/sec, and length l = 1 m is terminated by a load z1 = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be

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Q. A circular waveguide carries TE11 mode whose radial electric-field is given by

Er = E₀J1 (r) sin φ V/m

where 'r' is the radial distance in cm, from the waveguide axis. The cut-off wavelength of the mode is

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Q. The I/P impedance of a λ/8 long short circuited section of a loss less transmission line is

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Q. For frequencies upto 1650 kHz __________ antenna is used

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Q. Due to which of the following reasons, the ground wave eventually disappears, as one moves away from the transmitter?

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Q. A loop antenna may be of

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Q. Microwave signals transmitted towards the sky are

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Q. Radiation intensity does not depend upon

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Q. Δ²V = - ρ/E is known as __________ equation

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Q. A vertical earthed antenna is resonant when its physical height is equal to

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Q. Which of the following is a vector quantity?

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Q. Velocity of the wave when it passes from air into sphere

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Q. The ratio of the directivity of an end fire antenna to that of a broadside antenna is

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Q. If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by E(z, t) = 10 cos (2π x 10⁷t - 0.1 πz) volt/metre, then the velocity of the travelling wave is

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Q. The absorption of radio waves by atmosphere depends on

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

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Q. For a reflection co-efficient of 0.5, the value of SWR is

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Q. A rectangular waveguide having TE₁₀ mode as dominant mode is having a cut off frequency of 18 GHz for the TE₃₀ mode. The inner broad wall dimension of the rectangular waveguide is

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Q. A 50 π characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be

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