Test: Electromagnetic Field Theory - 3 - Electronics and Communication Engineering (ECE) MCQ

A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?

Poynting vector is associated with which of the following?

A 10 GHz signal propagates in a waveguide with a phase velocity of 4 x 10⁸ m/s. If the signal produces standing wave in the guide, then the distance between successive minimal will be

The incidence from dielectric medium 1 (ε₁) into dielectric medium 2 (ε₂), Brewster angle θ_B and the corresponding angle of transmission θ_t for will be respectively

A medium of relative permittivity ε_r2 = 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

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

A circular waveguide carries TE₁₁ mode whose radial electric-field is given by
E_r = E ₀J₁ (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

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with ε_r = 4. The reflection coefficient for the normal incidence is

A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be

Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100

The distance between maxima and minima of a standing wave is

A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is

A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly

The length of half-wave antenna is at 30 MHz

For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be

Which one of the following statement is not a correct for a plane wave with = 0.5e^-0.1x cos (10⁶t - 2x)a_z A/m?

Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100

If and

the time average Poynting vector is

Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz

For a transmission line with homogeneous dielectric the capacitance per unit length is 'c', the relative permittivity of the dielectric is 'ε_r' and velocity of light in free space is 'v' the characteristic impedance z₀ is equal to

The I/P impedance of a short circuited quarter wave long transmission line is

A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is