A  lossless transmission line is terminated with a load  of .

If the average incident power on the line is 10 mW, then the average power delivered to the load (in mW, rounded off to one decimal place) is ________.

Consider a lossless transmission line terminated with a short circuit as shown in the figure below. As one moves towards the generator from the load, the normalized impedances , and  (indicated in the figure) are_______.

A lossless transmission line with characteristic impedance  is terminated with an unknown load. The magnitude of the reflection co-efficient is . As one moves towards the generator from the load, the maximum value of the input impedance magnitude looking towards the load (in ) is ________.

The S-parameters of a two port network is given as

with reference to . Two lossless transmission line sections of electrical lengths  and  are added to the input and output ports for measurement purposes, respectively. The Sparameters  of the resultant two port network is

A transparent dielectric coating is applied to glass  to eliminate the reflection of red light . The minimum thickness of the dielectric coating, in , that can be used is ________. (rounded off to two decimal places).

The standing wave ratio on a  lossless transmission line terminated in an unknown load impedance is found to be 2.0. The distance between successive voltage minima is 30 cm and the first minimum is located at 10 cm from the load.  can be replaced by an equivalent length  and terminating resistance  of the same line. The value of  and , respectively, are

The following circuit(s) representing a lumped element equivalent of an infinitesimal section of a transmission line is/are

The impedance matching network shown in the figure is to match a lossless line having characteristic impedance  with a load impedance . A quarter-wave line having a characteristic impedance  is connected to . Two stubs having characteristic impedance of  each are connected to this quarter-wave line. One is a short-circuited (S.C.) sub of length  connected across  and the other one is an open-circuited (O.C.) stub of length  connected across RS.

The impedance matching is achieved when the real part of  is

The impedances , for all  in the range , map to the Smith chart as

A transmission line of length  and having a characteristic impedance of  is terminated with a load of . The impedance (rounded off to two decimal places) seen at the input end of the transmission line is ________.

A lossy transmission line has resistance per unit length. The line is distortion-less and has characteristic impedance of . The attenuation constant (in Np/m, correct to three decimal places) of the line is_______

The points P, Q, and R shown on the Smith chart (normalized impedance chart) in the following figure represent:

A two-wire transmission line terminates in a television set. The VSWR measured on the line is 5.8. The percentage of power that is reflected from the television set is ___________

The propagation constant of a lossy transmission line is (2 + j5)  and its characteristic impedance is (50+ jo)Ω at ω = rad . The values of the line constants L, C, R, G are, respectively,        

A lossless micro strip transmission line consists of a trace of width. It is drawn over a practically infinite ground plane and is separated by a dielectric slab of thickness t and relative permittivity. The inductance per unit length and the characteristic impedance of this line are L and, respectively.

Which one of the following inequalities is always satisfied?

A microwave circuit consisting of lossless transmission lines  and  is shown in the figure. The plot shows the magnitude of the input reflection coefficient  as a function of frequency f. The phase velocity of the signal in the transmission lines is m/s.

The length L (in meters) of  is ________.

A coaxial cable is made of two brass conductors. The spacing between the conductors is filled with Teflon . Which one of the following circuits can represent the lumped element model of a small piece of this cable having length ∆z?

Consider the 3 m long lossless air-filled transmission line shown in the figure. It has a characteristic impedance of 120π Ω, is terminated by a short circuit, and is excited with a frequency of 37.5MHz. What is the nature of the input impedance ?

A 200 m long transmission line having parameters shown in the figure is terminated into a load . The line is connected to a 400 V source having source resistance  through a switch, which is closed at t = 0. The transient response of the circuit at the input of the line (z = 0) is also drawn in the figure. The value of (in Ω) is ________.

For a parallel plate transmission line, let ν be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a reduction of the spacing between the plates by a factor of two results in

The input impedance of a   section of a lossless transmission line of characteristic impedance 50 Ω is found to be real when the other end is terminated by a load . If X is 30Ω , the value of R ( in Ω ) is _______.

To maximize power transfer, a lossless transmission line is to be matched to a resistive load impedance via a λ/4 transformer as shown.

The characteristic impedance (in Ω) of the λ/4 transformer is _________.

In the transmission line shown, the impedance  (in ohms) between node A and the ground is _________.

In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance  of Tx, the characteristic impedance of the cable and the input impedance of Rx are all real.

Which one of the following statements is TRUE about the distortion of the received signal due to impedance mismatch?

A coaxial cable with an inner diameter of 1 mm and outer diameter of 2.4 mm is filled with a dielectric of relative permittivity 10.89. Given  = 4π ×  H/m, , the characteristic impedance of the cable is

A transmission line with a characteristic impedance of 100 Ω is used to match a 50 Ω section to a 200 Ω section. If the matching is to be done both at 429 MHz and 1 GHz, the length of the transmission line can be approximately

 is terminated by a  load. When excited by a sinusoidal voltage source at 10 GHz, the phase difference between two points spaced 2 mm apart on the line is found to be  radians. The phase velocity of the wave along the line is

A transmission line of characteristic impedance  is terminated in a load impedance . The VSWR of the line is measured as 5 and the first of the voltage maxima in the line is observed at a distance of  from the load. The value of  is        

A transmission line has a characteristic impedance of  and a resistance of. If the line is distortion less, the attenuation constant (in Np/m) is

In the circuit shown, all the transmission line sections are lossless. The Voltage Standing Wave Ration (VSWR) on the 60W line is

A transmission line terminates in two branches, each of length , as shown. The branches are terminated by  loads. The lines are lossless and have the characteristic impedances shown. Determine the impedance  as seen by the source.

One end of a loss-less transmission line having the characteristic impedance of  and length of 1cm is short-circuited. At 3GHz, the input impedance at the other end of the transmission line is

A load of 50 Ω is connected in shunt in a 2-wire transmission line of Ω as shown in the figure. The 2-portscattering parameter matrix (S-matrix) of the shunt element is

The parallel branches of a 2-wire transmission line are terminated in 100 Ω and 200 Ω resistors as shown in the figure. The characteristic impedance of the line is  –50Ω and each section has a length of The voltage reflection coefficient at the input is

A transmission line is feeding 1 watt of power to a born antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free-space is:

A 30-Volts battery with zero source resistance is connected to a coaxial line of characteristic impedance of 50 Ohms at t = 0 second terminated in an unknown resistive load. The line length is that it takes for an electromagnetic wave to travel from source end to load end and vice-versa. At, the voltage at the load end is found to be 40 Volts.

The load resistance is

A 30-Volts battery with zero source resistance is connected to a coaxial line of characteristic impedance of 50 Ohms at t = 0 second terminated in an unknown resistive load. The line length is that it takes for an electromagnetic wave to travel from source end to load end and vice-versa. At, the voltage at the load end is found to be 40 Volts.

The steady-state current through the load resistance is:

Many circles are drawn in a smith chart used for transmission line calculations. The circles shown in figure represent

Characteristic impedance of a transmission line is . Input impedance of the open circuited line is . When the transmission line is short-circuited the value of the input impedance will be

Voltage standing wave pattern in a lossless transmission line with characteristic impedance and a resistive load is shown in figure

The value of the load resistance is         

Voltage standing wave pattern in a lossless transmission line with characteristic impedance and a resistive load is shown in figure.

The reflection coefficient is given by        

Consider a 300Ω quarter-wave long (at 1 GHz) transmission line as shown in Figure. It is connected to a 10V, 50Ω sources at one end and is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is

Consider impedance marked with point P in an impedance smith chart as shown in Fig.Q.88. The movement from point P along a constant resistance circle in the clockwise direction by an angle 45º is equivalent to

A lossless 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

A short-circuited stub is shunt connected to a transmission line as shown in Figure. If ohm, the admittance Y seen at the junction of the stub and the transmission line is

In an impedance smith chart, a clockwise moment along a constant resistance circle gives rise to

The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are  and  respectively. The characteristic impedance of the line is,

Two coaxial cables 1 and 2 are filled with different dielectric constants  and  respectively. The ratio of the wavelengths in the two cables,  is

Design a lossless impedance matching network shown in Figure to transform  to . Find the values of L, C and quality factor (Q) of the circuit at .

Assuming perfect conductors of a transmission line, pure TEM propagation is NOT possible in

In a twin-wire transmission line in air, the adjacent voltage maxima are at 12.5 cm and 27.5 cm.

The operating frequency is

In air, a lossless transmission line of length 50 cm with ,  is operated at 25MHz. Its electrical path length is

All transmission line sections shown in Figure have characteristic impedance. The input impedance  equals

A transmission line of  characteristic impedance is terminated with a  resistance. The minimum impedance measured on the line is equal to

A very lossy,  long,  transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately

 section of a  transmission line, short circuited at one end and open circuited at the other end, is shown in the figure is  generator is connected at the midpoint of the section as shown in the figure. Find voltage magnitude at the open circuited end of the line.

The capacitance per unit length and the characteristic impedance of a lossless transmission line are C and  respectively. The velocity of a travelling wave on the transmission line is

A load impedance  is to be matched to a lossless transmission line by using a quarter wave line transformer (QWT). The characteristic impedance of the QWT required is ____

If a pure resistance load, when connected to a lossless 75-ohm line, produces a VSWR of 3 on the line, then the load impedance can only be 25 ohms. (True=1,False=0)

Consider a transmission line of characteristic impedance of 50 ohm. Let it be terminated at one end by +j50 ohm. The VSWR produced by it in the transmission line will be

A transmission line whose characteristic impedance is a pure resistance

The input impedance of a short-circuited lossless transmission line quarter wave length is