Test: Electromagnetic Field Theory - 1 - Electronics and Communication Engineering (ECE) MCQ
25 Questions MCQ Test - Test: Electromagnetic Field Theory - 1
ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter-wave transformer should have a characteristic impedance of:
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 the same frequency then find the half-power beamwidth.
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Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of 1014 Hz in glass. Assume velocity of light is 3 x 108 m/sec in vacuum.
The function f(x - vot) 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
Ω.The input impedance of short-circuited line of length l where λ/4 < l < λ/2, is
, if Zd comes +j kZC then inductive, 
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, 
q = 120A rectangular metal waveguide filled with a dielectric of relative permittivity εr = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is
for dominant mode.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?
m = 0, n = 2The velocity of electromagnetic wave in a good conductor is
, for good conductor εr >> 1.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 
γ = jβThe 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.
Take, dominant mode m = 1, 
.Calculate the directivity of an antenna for θE = 30º, θH = 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
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