A dielectric waveguide for the propagation of electromagnetic energy at light frequencies
a. Stripline
b. Microstrip
c. Laser beam
d. Fiber optics

1 Answer

Answer :

d. Fiber optics

Related questions

Description : A dielectric waveguide for the propagation of electromagnetic energy at light frequencies ∙ a. Stripline ∙ b. Microstrip ∙ c. Laser beam ∙ d. Fiber optics

Last Answer : d. Fiber optics

Description : When electromagnetic wave are propagated through a waveguide, they A. are reflected from the walls but do not travel along them B. travel along all four walls of the waveguide C. travel along the broader walls of the guide D. travel through the dielectric without touching the walls

Last Answer : A. are reflected from the walls but do not travel along them

Description : Proposed the use of clad glass fiber as a dielectric waveguide a. Karpon and Keck b. Karpon and Bockham c. Bockham and Kao d. Kao and Keck

Last Answer : c. Bockham and Kao

Description : Proposed the use of a clad glass fiber as a dielectric waveguide. A. Kao and Keck B. Karpon and Keck C. Karpon and Bockham D. Bockham and Kao

Last Answer : D. Bockham and Kao

Description : Which of the following is used as an optical receiver in fiber optics communications a. APD b. Tunnel diode c. Laser diode d. LED

Last Answer : a. APD

Description : ________ generates light beam at a specific visible frequency. A. Glass fiber B. Infrared C. Light waves D. Laser

Last Answer : D. Laser

Description : An example for lossless propagation is a) Dielectric waveguide propagation b) Conductor propagation c) Cavity resonator propagation d) It is not possible

Last Answer : d) It is not possible

Description : Loss due to the diffraction of light when it strikes on the irregularities formed during the manufacturing process of the fiber optics. A. Absorption loss B. Attenuation C. Bending loss D. Rayleigh scattering loss

Last Answer : D. Rayleigh scattering loss

Description : A device that reduces the intensity of light in fiber optics communication systems. A. Reducer B. Quality factor C. Optical attenuator D. Compressor

Last Answer : C. Optical attenuator

Description : Best reason for pressurizing waveguides with dry air A. To maintain propagation B. To maintain temperature of the waveguide C. To reduce the possibility of internal arcing D. To increase the speed of propagation

Last Answer : C. To reduce the possibility of internal arcing

Description : Propagation mode of microwave in a waveguide is known as _______. A. TM B. TE C. SW D. TEM

Last Answer : B. TE

Description : What device in a waveguide system used for stopping or diverting electromagnetic wave as desired? A. Mechanical switch B. Electric switch C. Push-button switch D. Waveguide switch

Last Answer : D. Waveguide switch

Description : Proposed the use of clad glass fiber as a dielectric waveguide a. Karpon and Keck b. Karpon and Bockham c. Bockham and Kao d. Kao and Keck

Last Answer : c. Bockham and Kao

Description : What is the insertion loss of connector-type splices for a single mode fiber optics? a. 0.51dB b. 0.31dB c. 0.49dB d. 0.38dB

Last Answer : d. 0.38dB

Description : What is the average insertion loss of fusion splice in fiber optics? a. 0.09dB b. 0.9dB c. 0.19dB d. 0.009dB

Last Answer : a. 0.09dB

Description : One of the following is among the types of fiber optics used in electronics communication. A. Step-index multimode B. Graded-index multimode C. Semi-graded multimode D. Single mode

Last Answer : C. Semi-graded multimode

Description : Fiber optics posses following properties __________ a) Immune electromagnetic interference b) Very less signal attenuation c) Very hard to tap d) All of the mentioned

Last Answer : d) All of the mentioned

Description : In fiber optics, higher-order mode refers to ∙ a. Cladding boundary at high angle ∙ b. Backscattering electromagnetic signals ∙ c. Diffracting signals ∙ d. All of these

Last Answer : ∙ a. Cladding boundary at high angle

Description : Referred to the dielectric constant of a transmission line material. A. Inductance and capacitance B. Velocity factor C. Characteristic impedance D. Propagation velocity

Last Answer : B. Velocity factor

Description : What device measures the angle between two radio frequencies and also the direction of propagation of a wave? A. Densimeter B. Absorption wavemeter C. Goniometer D. Ergometer

Last Answer : C. Goniometer

Description : What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison

Last Answer : B. The combination of two signals to produce sum and difference frequencies.

Description : Dispersion is used to describe the a. Splitting of white light into its component colors b. Propagation of light in straight lines c. Bending of a beam of light when it goes from one medium to another d. Bending of a beam light when it strikes a mirror

Last Answer : a. Splitting of white light into its component colors

Description : ________ dispersion is caused by the difference in the propagation times of light rays that take different paths down a fiber. a. Material dispersion b. Wavelength dispersion c. Modal dispersion d. Delay dispersion

Last Answer : c. Modal dispersion

Description : ECE Board Exam November 1996 The loss in signal power as light travels down a fiber is A. attenuation B. propagation C. absorption D. scattering

Last Answer : A. attenuation

Description : Which of the following statements is not true with respect to microwaves? (A) Electromagnetic waves with frequencies from 300 GHz to 400 THz. (B) Propagation is line-of-sight. (C) Very ... waves cannot penetrate walls. (D) Use of certain portions of the band requires permission from authorities.

Last Answer : (A) Electromagnetic waves with frequencies from 300 GHz to 400 THz.

Description : Which of the following is used as an optical receiver in fiber optics communications ∙ a. APD ∙ b. Tunnel diode ∙ c. Laser diode ∙ d. LED

Last Answer : a. APD

Description : Electromagnetic waves of frequencies arbitrarily lower than 3,000 GHz, propagated in space without artificial guide. A. Space waves B. Terrestrial waves C. Mobile D. Hertzian waves

Last Answer : D. Hertzian waves

Description : The mode theory uses electromagnetic wave behavior to describe the propagation of the light along the fiber. What is a set of guided electromagnetic waves called?

Last Answer : Modes of the fiber.

Description : The first laser emitted a. Pulses of 694 nm red light b. A continuous red beam c. Pulses of white light from a helical flashlamp d. Spontaneous emission

Last Answer : a. Pulses of 694 nm red light

Description : What generates a light beam of a specific visible frequency? a. Laser b. Maser c. Infrared d. Flashlight

Last Answer : a. Laser

Description : Most mobile satellite array uses ___________ in transforming 50 to 150 Ω impedance. A. stub B. balun C. quarter-wavelength transformer D. microstrip tapers.

Last Answer : C. quarter-wavelength transformer

Description : What do you call a cable consisting of twisted pairs of conductors, each separately insulated? A. Microstrip line B. Strip line C. Quad D. Coaxial cable

Last Answer : C. Quad

Description : A single conductor running from the transmitter to the antenna. A. RG-8/U B. Single line wire C. Twin-lead D. MIcrostrip

Last Answer : B. Single line wire

Description : An electromagnetic wave is ________ polarized when the electric field lies wholly in one plane containing the direction of propagation. A. Horizontally B. Linearly C. Circularly D. Vertically

Last Answer : B. Linearly

Description : Fiber optic cables operate at frequencies near a. 20MHz b. 200MHz c. 2GHz d. 800THz

Last Answer : d. 800THz

Description : Fiber optic cable operates near _______ frequencies. A. 800 THz B. 20 MHz C. 200 MHz D. 2 GHz

Last Answer : A. 800 THz

Description : The size, shape, and dielectric material of a waveguide must be constant throughout its length for energy to move from one end to the other without reflections. What could be the effect in any abrupt change in its size or shape?

Last Answer : Reflections.

Description : What is the result of an abrupt change in the size, shape, or dielectric of a waveguide?

Last Answer : Reflections.

Description : Why are visible-light LEDs not used for fiber optics? ∙ a. It has high losses ∙ b. It has short wave ∙ c. It has low attenuation ∙ d. It has weak signal

Last Answer : ∙ a. It has high losses

Description : The following are the cause of light attenuation in fiber optics except ∙ a. Backscattering ∙ b. Absorption ∙ c. Refraction ∙ d. Microbends

Last Answer : c. Refraction

Description : In order for fiber optics to work, the incident light inside the fiber must hit the wall of the fiber at: w) 90 degrees x) 45 degrees y) an angle greater than the critical angle z) none of the above

Last Answer : ANSWER: Y -- AN ANGLE GREATER THAN THE CRITICAL ANGLE 

Description : Fiber optics cable used in communication, works on the principle of (1) regular reflection of light (2) diffuse reflection of light (3) refraction of light (4) total internal reflection of light

Last Answer : total internal reflection of light

Description : Any energy which radiates in the form of radio waves, infrared waves, light waves, x-rays, etc. A. Radiant energy B. Electromagnetic C. Heat D. Ultraviolet

Last Answer : B. Electromagnetic

Description : The ratio of speed of light in air to the speed of light in another substance is called the a. Speed factor b. Index of reflection c. Index of refraction d. Dielectric constant

Last Answer : c. Index of refraction

Description : Any small element of space in the path of a wave may be considered as a source of secondary wavelet. A. De Morgan’s Principle B. Faraday’s Law C. Huygen’s Principle D. Fresnel’s Law of optics

Last Answer : C. Huygen’s Principle

Description : Which of the following antennas is best excited from a waveguide? A. Biconical B. Horn C. Helical D. Discone

Last Answer : B. Horn

Description : A waveguide passive component that brings a smooth change in the direction of axis maintained perpendicular to the plane of polarization? A. L bend B. H bend C. T bend D. X bend

Last Answer : B. H bend

Description : Which of the following is not a bounded medium? A. Coaxial line B. Two-wire line C. Waveguide D. Free space

Last Answer : D. Free space

Description : The advantage of periscope antenna in microwave A. Minimize interference to and from other neighboring stations B. Shorten waveguide link C. Reduce tower height D. All of these

Last Answer : B. Shorten waveguide link