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When the length of the transmission line is same as that of the wavelength, then which condition holds good?
d Explanation: When the transmission line has a length same as that of the wavelength of the wave propagating through it, the input impedance will be same as the load impedance. This is the case where the wave is not amplified. The transmission line acts as a buffer.
d
See lessExplanation: When the transmission line has a length same as that of the wavelength of the wave propagating through it, the input impedance will be same as the load impedance. This is the case where the wave is not amplified. The transmission line acts as a buffer.
Find the phase constant of a wave travelling with a velocity of 1.2 x 108 and a frequency of 7.5 giga radian/sec
a Explanation: The phase constant is given by β = ω/v, from the definition of phase constant and velocity. On substituting for ω = 7.5 x 109 and v = 1.2 x 108 , we get the phase constant β = 7.5 x 109/1.2 x 108 = 62.5 units.
a
See lessExplanation: The phase constant is given by β = ω/v, from the definition of phase
constant and velocity. On substituting for ω = 7.5 x 109 and v = 1.2 x 108
, we get the phase constant β = 7.5 x 109/1.2 x 108 = 62.5 units.
The attenuation constant causes phase distortion and the phase constant causes frequency distortion. State True/False.
b Explanation: There are always some distortions, even in the perfect transmission line. This is due to the variation of the secondary parameters. The attenuation constant causes the frequency distortion, whereas the phase constant causes the phase distortion.
b
See lessExplanation: There are always some distortions, even in the perfect transmission line.
This is due to the variation of the secondary parameters. The attenuation constant
causes the frequency distortion, whereas the phase constant causes the phase
distortion.
The quarter wave transformer can be considered as a
a Explanation: A quarter wave transformer may be considered as an impedance inverter as it can transform a low impedance into a high impedance and vice-versa.
a
See lessExplanation: A quarter wave transformer may be considered as an impedance inverter
as it can transform a low impedance into a high impedance and vice-versa.
The purpose of the transmission line equation is to
d Explanation: The transmission line equation is useful in finding the length of the line which gives maximum power transfer. Thus it is useful for impedance matching.
d
See lessExplanation: The transmission line equation is useful in finding the length of the line
which gives maximum power transfer. Thus it is useful for impedance matching.
The reflection coefficient of a perfectly matched transmission line is
c Explanation: In a perfectly matched line, maximum power transfer will occur. Losses will be minimal. This implies unity transmission coefficient and zero reflection coefficient.
c
See lessExplanation: In a perfectly matched line, maximum power transfer will occur. Losses will be minimal. This implies unity transmission coefficient and zero reflection coefficient.
Find the characteristic impedance of a quarter wave with input and load impedances given by 50 and 25 respectively.
d Explanation: For a quarter line wave, the characteristic impedance is the geometric mean of input and load impedances. Thus Zo2 = Zin ZL. On substituting for Zin = 50 and ZL = 25, we get Zo2 = 50 x 25. The characteristic impedance will be 35.35 ohm.
d
See lessExplanation: For a quarter line wave, the characteristic impedance is the geometric
mean of input and load impedances. Thus Zo2 = Zin ZL. On substituting for Zin = 50 and ZL = 25, we get Zo2 = 50 x 25. The characteristic impedance will be 35.35 ohm.
The condition for a quarter wave transformer is
a Explanation: The quarter wave transformer represents L = λ/4. In this case, the characteristic impedance is the geometric mean of the input and load impedances. Thus Zo2 = Zin ZL is the required condition.
a
See lessExplanation: The quarter wave transformer represents L = λ/4. In this case, the
characteristic impedance is the geometric mean of the input and load impedances. Thus Zo2 = Zin ZL is the required condition.
The input impedance of a half wave transmission line with a load impedance of 12.5 ohm is
d Explanation: For a half wave transmission line L = λ/2, the input and the load impedances will be the same. Thus for the given data, the input impedance will be 12.5 ohm.
d
See lessExplanation: For a half wave transmission line L = λ/2, the input and the load
impedances will be the same. Thus for the given data, the input impedance will be 12.5
ohm.
The best transmission length for effective transmission of power is
b Explanation: Maximum transmission of power will occur, when the transmission line is matched. This implies that the input and characteristic impedances are the same. This condition is possible for l = λ/8 and l = ∞. Since l = ∞ is not feasible, the best option is l =λ/8.
b
See lessExplanation: Maximum transmission of power will occur, when the transmission line is matched. This implies that the input and characteristic impedances are the same. This condition is possible for l = λ/8 and l = ∞. Since l = ∞ is not feasible, the best option is l =λ/8.