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The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called
a Explanation: The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called lumped networks. These networks can be identified definitely as representing a particular parameter. An example is the filters.
a
See lessExplanation: The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called lumped networks. These networks can be identified definitely as representing a particular parameter. An example is the filters.
Which of the following parameters is not a primary parameter?
b Explanation: The primary parameters of a transmission line are the resistance, inductance, capacitance and conductance. The attenuation, phase and propagation constant are secondary parameters. Thus the odd one out is the attenuation constant
b
See lessExplanation: The primary parameters of a transmission line are the resistance,
inductance, capacitance and conductance. The attenuation, phase and propagation
constant are secondary parameters. Thus the odd one out is the attenuation constant
The phase constant of a wave propagation with frequency of 35 radian/sec and time delay of 7.5 sec is
b Explanation: The group delay expression is td = β/ω. To get β, put ω = 35 and td = 7.5. Thus we get β = td x ω = 7.5 x 35 = 262.5 units.
b
See lessExplanation: The group delay expression is td = β/ω. To get β, put ω = 35 and td = 7.5.
Thus we get β = td x ω = 7.5 x 35 = 262.5 units.
Calculate the transmission coefficient of a wave with a reflection coefficient of 0.6
d Explanation: The transmission coefficient is the reverse of the reflection coefficient. Thus T + τ = 1. On substituting for τ = 0.6, we get T = 0.4. It has no unit.
d
See lessExplanation: The transmission coefficient is the reverse of the reflection coefficient. Thus T + τ = 1. On substituting for τ = 0.6, we get T = 0.4. It has no unit.
Find the relative permittivity of the medium having a refractive index of 1.6
b Explanation: The refractive index is the square root of the relative permittivity. It is given by n = √εr. To get εr, put n = 1.6. We get εr = n2 = 1.62 = 2.56(no unit).
b
See lessExplanation: The refractive index is the square root of the relative permittivity. It is given by n = √εr. To get εr, put n = 1.6. We get εr = n2 = 1.62 = 2.56(no unit).
The transmission coefficient of a wave with incident and transmitted electric field of 5 and 5 respectively is
b Explanation: The transmission coefficient is the ratio of the transmitted electric field to the incident electric field. Thus T = Et/Ei. On substituting for Et = 5 and Ei = 5, we get T = 5/5 = 1(no unit). Simply, when the incident and transmitted field are same, no reflection occurs and the transmRead more
b
See lessExplanation: The transmission coefficient is the ratio of the transmitted electric field to the incident electric field. Thus T = Et/Ei. On substituting for Et = 5 and Ei = 5, we get T = 5/5 = 1(no unit). Simply, when the incident and transmitted field are same, no reflection occurs and the transmission is unity.
Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units.
b Explanation: The reflection coefficient is the ratio of the reflected electric field to the incident electric field. Thus τ = Er/Ei. On substituting for Ei = 5 and Er = 2, we get τ = 2/5= 0.4(no unit).
b
See lessExplanation: The reflection coefficient is the ratio of the reflected electric field to the
incident electric field. Thus τ = Er/Ei. On substituting for Ei = 5 and Er = 2, we get τ = 2/5= 0.4(no unit).
The Brewster angle is valid for which type of polarisation?
b Explanation: The Brewster angle is valid for perpendicular polarisation. The P polarised wave is also a type of perpendicular polarisation. In P polarisation, the electric field lies in the plane of the interface.
b
See lessExplanation: The Brewster angle is valid for perpendicular polarisation. The P polarised wave is also a type of perpendicular polarisation. In P polarisation, the electric field lies in the plane of the interface.
The group delay of a wave with phase constant 2.5 units and frequency of 1.2 radian/sec is
d Explanation: The group delay is given by td = β/ω. On substituting for β = 2.5 and ω = 1.2, we get the group delay as td = 2.5/1.2 = 2.08 units.
d
See lessExplanation: The group delay is given by td = β/ω. On substituting for β = 2.5 and ω =
1.2, we get the group delay as td = 2.5/1.2 = 2.08 units.
In P polarisation, the electric field lies in the same plane as the interface. State True/False.
a Explanation: In the EM wave propagation, the electric and magnetic fields are perpendicular to each other. The P polarised wave is similar to the transverse electric (TE) wave, the magnetic field lies in the plane perpendicular to that of the interface or the electric field lies in the same planeRead more
a
See lessExplanation: In the EM wave propagation, the electric and magnetic fields are
perpendicular to each other. The P polarised wave is similar to the transverse electric
(TE) wave, the magnetic field lies in the plane perpendicular to that of the interface or
the electric field lies in the same plane as the interface.