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The incident and the reflected voltage are given by 15 and 5 respectively. The transmission coefficient is
b Explanation: The ratio of the reflected to the incident voltage is the reflection coefficient. It is given by R = 5/15 = 1/3. To get the transmission coefficient, T = 1 – R = 1 – 1/3 =2/3.
b
See lessExplanation: The ratio of the reflected to the incident voltage is the reflection coefficient. It is given by R = 5/15 = 1/3. To get the transmission coefficient, T = 1 – R = 1 – 1/3 =2/3.
The power transmitted by a wave with incident power of 16 units is(Given that the reflection coefficient is 0.5)
a Explanation: The fraction of the transmitted to the incident power is given by the reflection coefficient. Thus Pref = (1-R2) Pinc. On substituting the given data, we get Pref= (1- 0.52) x 16 = 12 units. In other words, it is the remaining power after reflection.
a
See lessExplanation: The fraction of the transmitted to the incident power is given by the
reflection coefficient. Thus Pref = (1-R2) Pinc. On substituting the given data, we get Pref= (1- 0.52) x 16 = 12 units. In other words, it is the remaining power after reflection.
The power reflected by a wave with incident power of 16 units is(Given that the reflection coefficient is 0.5)
d Explanation: The fraction of the reflected to the incident power is given by the reflection coefficient. Thus Pref = R2xPinc. On substituting the given data, we get Pref = 0.52 x 16 = 4 units.
d
See lessExplanation: The fraction of the reflected to the incident power is given by the reflection coefficient. Thus Pref = R2xPinc. On substituting the given data, we get Pref = 0.52 x 16 = 4 units.
The power of a wave of with voltage of 140V and a characteristic impedance of 50 ohm is
c Explanation: The power of a wave is given by P = V2 /2Zo, where V is the generator voltage and Zo is the characteristic impedance. on substituting the given data, we get P = 1402/(2×50) = 196 units.
c
See lessExplanation: The power of a wave is given by P = V2
/2Zo, where V is the generator voltage and Zo is the characteristic impedance. on substituting the given data, we get P = 1402/(2×50) = 196 units.
The power of the electromagnetic wave with electric and magnetic field intensities given by 12 and 15 respectively is
b Explanation: The Poynting vector gives the power of an EM wave. Thus P = EH/2. On substituting for E = 12 and H = 15, we get P = 12 x 15/2 = 90 units.
b
See lessExplanation: The Poynting vector gives the power of an EM wave. Thus P = EH/2. On
substituting for E = 12 and H = 15, we get P = 12 x 15/2 = 90 units.
The skin depth of a wave with phase constant of 12 units inside a conductor is
b Explanation: The skin depth is the reciprocal of the phase constant. On substituting for β= 12, we get δ = 1/β = 1/12 units.
b
See lessExplanation: The skin depth is the reciprocal of the phase constant. On substituting for β= 12, we get δ = 1/β = 1/12 units.
The electric and magnetic field components in the electromagnetic wave propagation are in phase. State True/False.
a Explanation: In dielectrics, the electric and magnetic fields will be in phase or the phase difference between them is zero. This is due to the large attenuation which leads to increase in phase shift.
a
See lessExplanation: In dielectrics, the electric and magnetic fields will be in phase or the phase difference between them is zero. This is due to the large attenuation which leads to increase in phase shift.
The expression for intrinsic impedance is given by
c Explanation: The intrinsic impedance is given by the ratio of square root of the permittivity to the permeability. Thus η = √(μ/ε) is the intrinsic impedance. In free space or air medium, the intrinsic impedance will be 120π or 377 ohms.
c
See lessExplanation: The intrinsic impedance is given by the ratio of square root of the
permittivity to the permeability. Thus η = √(μ/ε) is the intrinsic impedance. In free space or air medium, the intrinsic impedance will be 120π or 377 ohms.
The phase constant of a wave with wavelength 2 units is
b Explanation: The phase constant is given by β = 2π/λ. On substituting λ = 2 units, we get β = 2π/2 = π = 3.14 units.
b
See lessExplanation: The phase constant is given by β = 2π/λ. On substituting λ = 2 units, we get β = 2π/2 = π = 3.14 units.
The relation between the speed of light, permeability and permittivity is
a Explanation: The standard relation between speed of light, permeability and permittivity is given by c = 1/√(με). The value in air medium is 3 x 108 m/s.
a
See lessExplanation: The standard relation between speed of light, permeability and permittivity is given by c = 1/√(με). The value in air medium is 3 x 108 m/s.