Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

101.

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.

Answer» Vg . Vp = C2 where .
Discussion
102.

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

Answer» .
Discussion
103.

Calculate the directivity of an antenna for θ = 30°, θ = 60

Answer» .
Discussion
104.

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

Answer»
Discussion
105.

For F layer the maximum ionic density is 2.3 x 10 electrons per cc. The critical frequency for this layer will be

Answer» fc = 9Nmax .
Discussion
106.

The velocity of electromagnetic wave in a good conductor is

Answer» , for good conductor εr >> 1.
Discussion
107.

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

Answer» I ∝ f.
Discussion
108.

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

Answer» for dominant mode.
Discussion
109.

Z = 200 Ω and it is desired that Z = 50 Ω The quarter wave transformer should have a characteristic impedance of

Answer» Z0 = Zi . ZL
Discussion
110.

A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth

Answer» .
Discussion
111.

Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 10 Hz in glass. Assume velocity of light is 3 x 10 m/sec in vacuum.

Answer» Given, μ = 1.6, f = 1014 Hz, v = 3 x 108 m/sec.
Discussion
112.

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

Answer» P = n . I2 . Rr, where Rr = 80p2 Ω. n = 4.
Discussion