Terms, Definitions, MCQs and Free Templates
Practice and Learn everything. Definitions, MCQs, Tutorials, Solutions and Create your own Free Templates
ZL = 200 Ω and it is desired that Zi = 50 Ω The quarter wave transformer should have a characteristic impedance of
For TE or TM modes of propagation in bounded media, the phase velocity is
An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
When a particular mode is excited in a waveguide, these appears an extra electric components in the direction of propagation. The resulting mode is
Ferromagnetic materials
The L/C has the dimension of
An electric charge Q is placed in a dielectric medium which of the following quantities are independent of the dielectric constant ε of the medium
The thin parallel wires are carrying current along the same direction. The force experienced by one due to the other is
Laplacian of a scalar function v 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
Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θi of 30° from air into polystyrene, the angle of transmission will be nearly
The cut off wavelength λc for TE20 mode for a standard rectangles waveguide is
The dimension of flux density is
A piece of copper and another piece of Germanium are cooled from 30°C to 80 K. The resistance of
For a hollow waveguide, the axial current must necessarily be
Consider the following; for a loss-less transmission line we can write, Zin = – jz0 for a shorted line with l = λ/8Zin = ± j ∞ for a shorted line with l = λ/4Zin= jz0 for an open line with l = λ/2Zin = 0 for a matched line of any length Select the […]
The current distribution along a travelling wave antenna can be written in the form
For a wave propagating in air filled rectangular waveguide.
It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be
When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called
A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m3 . The phase velocity vp (assuming velocity of light as 3 x 108 m/sec) is
When a plane wave is incident normally from dielectric ‘1’ (μ0, ε1) onto dielectric ‘2’ (μ0, ε2) the electric field of the transmitted wave is 2 times the electric field of the reflected wave. The ratio ε2/ε1 is
For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be
A rectangular waveguide (2.29 x 1.02) cm operates at a freq. of 11 GHz in TE10 mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be
A transmission line has primary constants R, L, G and C and secondary constant z0 and γ = (a + Jβ). If the line is loss less, then
In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as
Consider an arbitrary distribution of conducting bodies in a charge free space according to the uniqueness theorem, which of following are required to be specified in order that the field is uniquely determined everywhere? Total charge on each conductorPotential at each conductor surfacePotential at same of conductor and total charge on the remainderTotal charge as […]
The fact that domains exhibits spontaneous magnetisation is
For TM waves in a parallel plate waveguide, the minimum attenuation arising from imperfect conductors would occur at a freq. of (fc is the cut off frequency)
For a rectangular waveguide (a x b, a > b) to support only the TE10 mode at wavelength which one of the following pairs of in equalities is to be satisfied?
Solution of Laplace equations, which are continuous through the second derivative, are called
Magnetic hysteresis phenomenon is explained by
A TEM wave incident obliquely on a dielectric boundary with εr1 = 2 and εr2 = 1, the angle of incidence for total reflection is
In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to
The unit of ∇ x H is
When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
The phase velocity of an EM wave propagating in a hollow metallic rectangular waveguide in the TE10 mode is
A loss less transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is
In a ferromagnetic material, the internal field seen by a dipole is
When a plane wave travelling in free space is incident normally on a medium having εr = 4.0, then fraction of power transmitted into the medium is given by