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The velocity of a wave travelling in the air medium without transmission lines or waveguides(wireless) is
b Explanation: In free space or air medium, the velocity of the wave propagating will be same as that of the light. Thus the velocity is the speed of light, V = c. It is given by 3 x 108m/s.
b
See lessExplanation: In free space or air medium, the velocity of the wave propagating will be
same as that of the light. Thus the velocity is the speed of light, V = c. It is given by 3 x
108m/s.
In free space, the ratio of frequency to the velocity of light gives the phase constant. State True/False.
a Explanation: The phase constant is given by the ratio of the frequency in radian/sec to the velocity of the wave propagating. In free space, the velocity is considered to be the velocity of light. Thus the statement is true.
a
See lessExplanation: The phase constant is given by the ratio of the frequency in radian/sec to
the velocity of the wave propagating. In free space, the velocity is considered to be the
velocity of light. Thus the statement is true.
In free space, the condition that holds good is
b Explanation: The free space does not have any barrier for attenuation. Thus it enables minimum attenuation and maximum propagation. This technique is employed in line of sight communication.
b
See lessExplanation: The free space does not have any barrier for attenuation. Thus it enables
minimum attenuation and maximum propagation. This technique is employed in line of sight communication.
The intrinsic impedance of free space is
d Explanation: The intrinsic impedance is the square root of ratio of the permeability to the permittivity. In free space, the permeability and the permittivity is same as the absolutepermeability and permittivity respectively. This is due to unity permeability and permittivity in free space. Thus ηRead more
d
See lessExplanation: The intrinsic impedance is the square root of ratio of the permeability to the permittivity. In free space, the permeability and the permittivity is same as the absolutepermeability and permittivity respectively. This is due to unity permeability and permittivity in free space. Thus η = √(μ/ε), where absolute permeability is given by 4π x 10-7 and absolute permittivity is given by 8.854 x 10-12. The intrinsic impedance will be 377 ohms.
Zero permeability/permittivity implies which state?
c Explanation: The zero permittivity in an electric field refers to the ability of the field/medium to permit electric charges in it. Similarly, zero permeability in a magnetic field refers to the ability of the field/medium to permit the magnetic energy into the field.
c
See lessExplanation: The zero permittivity in an electric field refers to the ability of the
field/medium to permit electric charges in it. Similarly, zero permeability in a magnetic field refers to the ability of the field/medium to permit the magnetic energy into the field.
The conductivity in free space medium is
c Explanation: As the charge carriers are not available in free space, the conductivity will be very low. For ideal cases, the conductivity can be taken as zero.
c
See lessExplanation: As the charge carriers are not available in free space, the conductivity will be very low. For ideal cases, the conductivity can be taken as zero.
Which parameter is unity in air medium?
c Explanation: In free space or air medium, the relative permeability is also unity, like relative permittivity. The absolute permeability is given by 4π x 10-7 units.
c
See lessExplanation: In free space or air medium, the relative permeability is also unity, like
relative permittivity. The absolute permeability is given by 4π x 10-7 units.
In free space, which parameter will be unity?
c Explanation: The relative permittivity is a constant for a particular material. It is unity for free space or air. The absolute permittivity is a constant given by 8.854 x 10-12 C/m2.
c
See lessExplanation: The relative permittivity is a constant for a particular material. It is unity for free space or air. The absolute permittivity is a constant given by 8.854 x 10-12 C/m2.
In free space, the charge carriers will be
a Explanation: Free space is not a conductor. Thus the charge carrier in free space is assumed to be zero. But the free space consists of particles or ions that get ionized during conduction.
a
See lessExplanation: Free space is not a conductor. Thus the charge carrier in free space is
assumed to be zero. But the free space consists of particles or ions that get ionized
during conduction.
The attenuation constant in lossless dielectrics will be
a Explanation: In lossless dielectrics, the attenuation constant will not be same as the phase constant, unlike conductors. Also, due to the lossless behaviour, the attenuation will be nearly zero. Practically, zero attenuation is not possible.
a
See lessExplanation: In lossless dielectrics, the attenuation constant will not be same as the
phase constant, unlike conductors. Also, due to the lossless behaviour, the attenuation
will be nearly zero. Practically, zero attenuation is not possible.