Test: Electromagnetic Field Theory - 1 - Electronics and Communication Engineering (ECE) MCQ

The function f(x - v_ot) represent which of the following?

A broadside array operating at 100 cm wavelength consist of 4 half-wave dipoles spaced 50 cm apart. Each element carries radio frequency current in the same phase and of magnitude 0.5 A. The radiated power will be

The input impedance of short-circuited line of length l where λ/4 < l < λ/2, is

A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

Find the radiation resistance of an antenna of length λ/10 meter?

Charge needed within a unit sphere centred at the origin for producing a potential field,

A rectangular metal waveguide filled with a dielectric of relative permittivity ε_r = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calculate group velocity for dominant mode.

For F₁ layer the maximum ionic density is 2.3 x 10⁴ electrons per cc. The critical frequency for this layer will be

Which one of the following does represents the electric field lines for the TE₀₂ mode in the cross section of a hollow rectangular metallic waveguide?

The velocity of electromagnetic wave in a good conductor is

Radiation intensity of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is 'I'. Then at a frequency of f/2, the intensity will be

Consider a 300 Ω, quarter wave long at 1 GHz transmission line as shown in figure. It is connected to a 10 V, 50 Ω source at one end is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is

The phase angle corresponding to λ/4 in a standing-wave pattern is

A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.

Calculate the directivity of an antenna for θ_E = 30º, θ_H = 60

Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is

A (75 - j 40) W load is connected to a co-axial line of z₀ = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

A plane wave is characterized by the wave is

The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε₀. The surface charge density on the conductor is ((ε₀ = 10^-9/36p)F/m)

A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is