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BARC ECE 2019 : EMT Nuclear Quiz 1

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Question 1

The expression for an electric field in free space is E=E₀=

where x, y, z represent the spatial coordinates, t represents time, and ω, k are constants. This electric field

Question 2

For a lossy antenna, the magnitude of gain is

Question 3

An uniform plane wave propagating in free space with electric field component

Is normally incident on a lossless medium with $Description: E:\Gate\Gate-EC\04_Elctromgntic_BL-done_files\image153.png$ placed at $Description: E:\Gate\Gate-EC\04_Elctromgntic_BL-done_files\image123.png$ . The transmitted magnetic field component is given by

Question 4

For an 8 feet (2.4 m) parabolic disk antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to

Question 5

A 40Ω, 4.2 meters long lossless line is operated at 75MHz. The phase velocity is 0.2c and the input impedance at the middle of the line is 60 - j50Ω. What is the input impedance at the generator?

Question 6

The longitudinal component of the magnetic field inside an air-filled rectangular waveguide made of a perfect electric conductor is given by the following expression

The cross-sectional dimensions of the waveguide are given as a = 0.08 m and b = 0.033 m. The mode of propagation inside the waveguide is

Question 7

An antenna has a radiation resistance of 50 Ω and a loss resistance of 10 Ω. If the power gain of antenna is 20, the directive gain of the antenna is given by

Question 8

Two point charges in a dielectric medium with $Description: E:\Gate\Gate-EC\04_Elctromgntic_BL-done_files\image001.png$ =2.25 interact with a magnitude of force of F₁ newtons.The magnitude the force F₂ it the same charges were present in free space is given by.