# Waveguides mcq

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## Transmission Line MCQ

Fully solved examples with detailed answer description. Microwave Engineering - ECE Questions and Answers This is the electronics and communication engineering questions and answers section on "Microwave Communication" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.

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Micro wave B. Report Error. Which of the following bands that comes under Microwave Band A. Which of the following is the main advantage of microwave A. Highly directive B. Moves at the speed of light C. Amplifier B. Oscillator C. Attenuator D. On which of the following principle does Klystron operates A. Amplitude Modulation B. Frequency Modulation C. Pulse Modulation D.To lay a strong foundation on the theory of transmission lines and wave guides by highlighting their applications.

Different types of transmission lines Definition of Characteristic impedance The transmission line as a cascade of T-Sections - Definition of Propagation Constant. General Solution of the transmission line The two standard forms for voltage and current of a line terminated by an impedance physical significance of the equation and the infinite line The two standard forms for the input impedance of a transmission line terminated by an impedance meaning of reflection coefficient wavelength and velocity of propagation.

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Waveform distortion distortion less transmission line The telephone cable Inductance loading of telephone cables. Input impedance of lossless lines reflection on a line not terminated by Zo Transfer impedance reflection factor and reflection loss T and Section equivalent to lines. Standing waves and standing wave ratio on a line One eighth wave line The quarter wave line and impedance matching the half wave line.

The circle diagram for the dissipationless line The Smith Chart Application of the Smith Chart Conversion from impedance to reflection coefficient and vice-versa. Impedance to Admittance conversion and viceversa Input impedance of a lossless line terminated by an impedance single stub matching and double stub matching.

Transverse Electromagnetic waves Velocities of propagation component uniform plane waves between parallel planes Attenuation of TE and TM waves in parallel plane guides Wave impedances. Bessel functions Solution of field equations in cylindrical co-ordinates TM and TE waves in circular guides wave impedances and characteristic impedance Dominant mode in circular waveguide excitation of modes Microwave cavities, Rectangular cavity resonators, circular cavity resonator, semicircular cavity resonator, Q factor of a cavity resonator for TE mode.

Jordan and K. David M. David K. Define the line parameters? What are the secondary constants of a line? Why the line parameters are called distributed elements? The secondary constants of a line are: Characteristic Impedance Propagation Constant Since the line constants R, L, C, G are distributed through the entire length of the line, they are called as distributed elements.

They are also called as primary constants. Define Characteristic impedance Characteristic impedance is the impedance measured at the sending end of the line. Define Propagation constant Propagation constant is defined as the natural logarithm of the ratio of the sending end current or voltage to the receiving end current or voltage of the line. It gives the manner in the wave is propagated along a line and specifies the variation of voltage and current in the line as a function of distance.

What is a finite line? Write down the significance of this line? A finite line is a line having a finite length on the line. What is an infinite line?

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An infinite line is a line in which the length of the transmission line is infinite. A finite line, which is terminated in its characteristic impedance, is termed as infinite line. So for an infinite line, the input impedance is equivalent to the characteristic impedance.

### RRB JE for Electrical Engineering | Notes, Videos, MCQs & PPTs

What is wavelength of a line? The distance the wave travels along the line while the phase angle is changing through 2 radians is called a wavelength. What are the types of line distortions? The distortions occurring in the transmission line are called waveform distortion or line distortion. Waveform distortion is of two types: a Frequency distortion b Phase or Delay Distortion. How frequency distortion occurs in a line? When a signal having many frequency components are transmitted along the line, all the frequencies will not have equal attenuation and hence the received end waveform will not be identical with the input waveform at the sending end because each frequency is having different attenuation.

This type of distortion is called frequency distortion. How to avoid the frequency distortion that occurs in the line?Answer: c Explanation: The waveguides use total internal reflection phenomenon to transmit the waves passing through it. Thus the acceptance angle and critical angle are important for effective transmission. Answer: b Explanation: The dominant mode is the mode which has the minimum frequency or maximum wavelength available for propagation of the waves.

Answer: d Explanation: The modes are calculated from the V number of the waveguides. Answer: c Explanation: The circular or cylindrical waveguides use the Bessel function for the frequency calculation of a particular mode.

Answer: c Explanation: The scattering matrix consists of the transmission coefficients in the main diagonal and the reflection coefficients in the opposite diagonal. The h parameter is not used for the same. For a matched line, the reflection coefficients are zero. Answer: a Explanation: Generally, the waveguides are made of materials with low bulk resistivity like brass, copper, silver etc.

But if the interior walls are properly plated, it is possible with poor conductivity materials too. It is even possible to make plastic waveguides. Answer: a Explanation: The waveguides aid in effective transmission of the electromagnetic power from the source antenna to the destination antenna. Answer: d Explanation: Waveguides are employed for effective transmission, when the lines carry electromagnetic waves in the GHz range. Answer: d Explanation: The cut off frequency of the waveguide is 6 GHz.

This is the frequency at which the waveguide will start to operate. Answer: b Explanation: In rectangular waveguide, the a parameter is the broad wall dimension of the waveguide and the b parameter is the side wall dimension of the waveguide.

Answer: a Explanation: The Bessel function is used in the circular waveguides. Here n is the order of the Bessel function. Answer: b Explanation: In air medium, the phase velocity is assumed to be the speed of light. For waveguides, the phase velocity is always greater than the speed of the light. Answer: a Explanation: In a waveguide, the phase velocity is greater than the velocity of light.

Thus the group velocity will be less. This implies the group wavelength will be greater than the wavelength at any point. The V number is A waveguide is a structure that guides waves, such as electromagnetic waves or soundwith minimal loss of energy by restricting the transmission of energy to one direction.

Without the physical constraint of a waveguide, wave amplitudes decrease according to the inverse square law as they expand into three dimensional space. There are different types of waveguides for different types of waves. The original and most common [1] meaning is a hollow conductive metal pipe used to carry high frequency radio wavesparticularly microwaves. Dielectric waveguides are used at higher radio frequencies, and transparent dielectric waveguides and optical fibers serve as waveguides for light.

In acousticsair ducts and horns are used as waveguides for sound in musical instruments and loudspeakersand specially-shaped metal rods conduct ultrasonic waves in ultrasonic machining. The geometry of a waveguide reflects its function; in addition to more common types that channel the wave in one dimension, there are two-dimensional slab waveguides which confine waves to two dimensions. The frequency of the transmitted wave also dictates the size of a waveguide: each waveguide has a cutoff wavelength determined by its size and will not conduct waves of greater wavelength; an optical fiber that guides light will not transmit microwaves which have a much larger wavelength.

Some naturally occurring structures can also act as waveguides.

Waves propagate in all directions in open space as spherical waves. The power of the wave falls with the distance R from the source as the square of the distance inverse square law.

A waveguide confines the wave to propagate in one dimension, so that, under ideal conditions, the wave loses no power while propagating. Due to total reflection at the walls, waves are confined to the interior of a waveguide. The uses of waveguides for transmitting signals were known even before the term was coined.

The phenomenon of sound waves guided through a taut wire have been known for a long time, as well as sound through a hollow pipe such as a cave or medical stethoscope. Other uses of waveguides are in transmitting power between the components of a system such as radio, radar or optical devices.

### Microwave Waveguides – Exercise – 1

Waveguides are the fundamental principle of guided wave testing GWTone of the many methods of non-destructive evaluation. The first structure for guiding waves was proposed by J.

Thomson inand was first experimentally tested by Oliver Lodge in The first mathematical analysis of electromagnetic waves in a metal cylinder was performed by Lord Rayleigh in The study of dielectric waveguides such as optical fibers, see below began as early as the s, by several people, most famous of which are Rayleigh, Sommerfeld and Debye.Login New User.

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A rectangular waveguide has a width of 1 inch and a height of 0. Its cutoff frequency is :. A waveguide has a cutoff frequency of 17 GHz. Which of the following signals will not be passed by the waveguide? The dominant mode for rectangular waveguide is :. A waveguide is also a :. What is the wavelength of a wave in a waveguide? What is the cut-off frequency of a waveguide? The dominant mode for circular waveguide is :. A magnetic field is introduced into waveguide by a :.

The main advantage of the two hole directional coupler is :. Materials generally preferred for wave guides are :. In a waveguide the energy is propagated by :. The skin effect causes current to flow :.

A device used for coupling microwave energy is known as :. A quarter-wave sub shorted at the end has high impendance :. The angle between electric and magnetic fields in a waveguide is :. Sign in. Log into your account. Forgot your password?

Lec 5: Introduction to Waveguides and Rectangular Waveguide

Sign up. Password recovery.To lay a strong foundation on the theory of transmission lines and wave guides by highlighting their applications.

To become familiar with propagation of signals through lines Understand signal propagation at Radio frequencies Understand radio propagation in guided systems To become familiar with resonators.

Different types of transmission lines — Definition of Characteristic impedance. General Solution of the transmission line — The two standard forms for voltage and current of a line terminated by an impedance — physical significance of the equation and the infinite line — The two standard forms for the input impedance of a transmission line terminated by an impedance — meaning of reflection coefficient — wavelength and velocity of propagation.

Waveform distortion — distortion less transmission line — The telephone cable. Standing waves and standing wave ratio on a line — One eighth wave line — The quarter wave line and impedance matching — the half wave line. The circle diagram for the dissipationless line — The Smith Chart — Application of the Smith Chart — Conversion from impedance to reflection coefficient and vice-versa.

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Impedance to Admittance conversion and viceversa — Input impedance of a lossless line terminated by an impedance — single stub matching and double stub matching. Waves between parallel planes of perfect conductors — Transverse electric and transverse magnetic waves — characteristics of TE and TM Waves —.

Transverse Electromagnetic waves — Velocities of propagation — component uniform plane waves between parallel planes — Attenuation of TE and TM waves in parallel plane guides — Wave impedances. Bessel functions — Solution of field equations in cylindrical co-ordinates — TM and TE waves in circular guides — wave impedances and characteristic impedance — Dominant mode in circular waveguide — excitation of modes — Microwave cavities, Rectangular cavity resonators, circular cavity resonator, semicircular cavity resonator, Q factor of a cavity resonator for TE mode.

TOTAL : Jordan and K. David M. David K. Define the line parameters? The parameters of a transmission line are:. What are the secondary constants of a line? Why the line parameters are.

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The secondary constants of a line are:. Characteristic Impedance Propagation Constant.