Description : What is the best type of surface or terrain to use for radio wave transmission?
Last Answer : Radio horizon is about 1/3 farther.
Description : Attenuation is mainly a result of what three properties?
Last Answer : Light absorption, scattering, and bending losses.
Description : . What are two of the three physical factors that determine the values of capacitance and inductance of a transmission line?
Last Answer : (1) Type of line used, (2) dielectric in the line, and (3) length of line.
Description : Is the attenuation of a coaxial cable independent of frequency?
Last Answer : No.
Description : If the length of the fiber point defect changes with pulse duration, is the OTDR signal deviation a point defect or a region of high fiber attenuation?
Last Answer : A point defect.
Description : Why is a dead-zone fiber placed between the test fiber and OTDR when conducting attenuation measurements?
Last Answer : To reduce the effect of the initial reflection at the OTDR
Description : in multimode fibers, how do fiber joints increase fiber attenuation following the joint?
Last Answer : By disturbing the fiber's mode power distribution (MPD).
Description : What two properties of the launch condition may affect multimode fiber attenuation measurements?
Last Answer : . Launch spot size and angular distribution.
Description : Will an optical fiber's attenuation coefficient vary with changes in wavelength?
Last Answer : Yes.
Description : Define attenuation.
Last Answer : Attenuation is the loss of optical power as light travels along the fiber.
Description : What characteristic is determined by the time required for a voltage wave to travel from the input end of an artificial transmission line to the output end and back again?
Last Answer : Pulse width
Last Answer : Pulse width.
Description : To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?
Last Answer : 2.5 times the highest modulating frequency.
Description : Reduction of signal strength during transmission is called attenuation. -Technology
Last Answer : TrueDuring transmission, the signal strength is reduced, this phenomenon is called attenuation.
Description : Which of the following phenomena is possible is free space medium? A. Reflection of radio wave B. Diffraction of radio wave C. Refraction of radio wave D. Attenuation of radio wave
Last Answer : D. Attenuation of radio wave
Description : The presence of standing waves on a transmission line is the result of A. a high level of attenuation on the line. B. terminating the line by a resistive load equal in value to the surge impedance ... input power to below its critical level. D. an impedance mismatch between the load and the line.
Last Answer : D. an impedance mismatch between the load and the line.
Description : What is the amount of sound reduction provided by a barrier – wall, floor, or ceiling called? A. Sound Attenuation B. Transmission loss C. Sound absorption D. Barrier loss
Last Answer : B. Transmission loss
Description : _______ is a typeof transmission impairment in which an outside sourcesuch as crosstalk corrupts asignal. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Noise
Description : ________ is a typeof transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Distortion
Description : ________ is a typeof transmission impairment in which the signal loses strength due to theresistance of the transmission medium. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Attenuation
Description : The phase shift in the electric and magnetic fields in an EM wave is given by which parameter? a) phase constant b) attenuation constant c) propagation constant d) intrinsic impedance
Last Answer : d) intrinsic impedance
Description : Computers cannot communicate with each other directly over telephone lines because they usedigitalpulses whereas telephone lines useanalog sound frequencies. What is the name of the device which permits digital to analog ... A. Interface B. Modem C. Attenuation D. Teleprocessor E. None of the above
Last Answer : Modem
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 : ..................... is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. (A) Attenuation (B) Distortion (C) Noise (D) Decibel
Last Answer : (A) Attenuation
Description : When the wave travels in a conducting medium, the rate of attenuation is decided by
Last Answer : When the wave travels in a conducting medium, the rate of attenuation is decided by Both attenuation constant and phase constant
Description : What must the physical length of a transmission line be if it will be operated at 15,000,000 Hz?
Last Answer : . λ = 20 meters
Description : What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?
Last Answer : The traveling wave must have a forward velocity equal to or less than the speed of the electrons in the beam.
Description : To measure incident power, you must rotate the coupler detector of the wattmeter so that the arrow indicating power flow points toward which end of the transmission line?
Last Answer : Load.
Description : When a wave is reflected from a surface, energy is transferred. When is the transfer of energy greatest?
Last Answer : When the incident wave is nearly parallel with the surface.
Description : A light wave enters a sheet of glass at a perfect right angle to the surface. Is the majority of the wave reflected, refracted, transmitted, or absorbed?
Last Answer : Transmitted.
Description : When a wave is reflected from a surface, energy is reflected. When is the reflection of energy the greatest?
Last Answer : When the wave is nearly parallel to the reflecting surface.
Description : What factors should be considered when selecting a primary cell for a power source?
Last Answer : Cost, size, ease of replacement, and voltage or current needs. b. Capacitance is the property of a circuit which opposes changes in voltage.
Description : Transmission line must be matched to the load to A. transfer maximum voltage to the load B. transfer maximum current to the load C. reduce the load current D. transfer maximum power to the load
Last Answer : D. transfer maximum power to the load
Description : The output of the sum point must contain information that controls what two factors of load movement in a position servo?
Last Answer : Amount and direction of rotation.
Description : Band loss is ∙ a. A reduction in transmitter power caused by earth’s surface curvature ∙ b. A reduction in strength of the signal caused by folded dipole bends ∙ c. An attenuation increase caused by bends radiating from the side of the fiber ∙ d. All of these
Last Answer : c. An attenuation increase caused by bends radiating from the side of the fiber
Description : What generator characteristics must be considered when alternators are synchronized for parallel operation?
Last Answer : Output voltage, frequency, and phase relationships.
Description : State the factors to be considered for selecting transmission media.
Last Answer : Eight factors to be considered: 1. Type of medium. 2. No of conductors/connectors. 3. Flexibility. 4. Durability. 5. Bandwidth. 6. Reliability of connection 7. Required ... parallel wires 12. Resistance to external EMI outside the cable. 13. Attenuation characteristics 14. Cost
Description : For an electric field to exist at the surface of a conductor, the field must have what angular relationship to the conductor?
Last Answer : The field must be perpendicular to the conductors.
Description : What are the three requirements for a wave to be propagated?
Last Answer : A source, medium, and detector (receiver).
Description : What are three ways of controlling radiated emi during transmission?
Last Answer : a) physical separation of the antenna (b) limiting bandwidth of the antenna (c) use of directional antennas
Description : What are the three types of line losses associated with transmission lines?
Last Answer : Copper, dielectric, and radiation.
Description : A light wave can be represented as a plane wave. What three properties of light propagation describe a plane wave?
Last Answer : Direction, amplitude, and wavelength of propagation
Description : Name three advantages of cw transmission
Last Answer : A high degree of clarity even under severe noise conditions, long-range operation, and narrow bandwidth.
Description : What are the three requirements for cw transmission?
Last Answer : A method of generating oscillations, a method of turning the oscillations on and off (keying), and an antenna to radiate the energy.
Description : My first is found on the ocean wave, In the spring, the pit, and the mine; My second below earth’s surface you have, Where seldom the sun can shine. My whole your dinner-table must grace, And seldom fails to obtain a place.What am I? -Riddles
Last Answer : Salt-cellar.
Description : What Two factors must be considered when selecting a suitable site for new air compressor?
Last Answer : Need answer
Description : What two factors must be considered when replacing old RAM modules in a PC?
Last Answer : What is the answer ?
Description : What two factors must be considered when replacing old RAM modules in a PC (Choose two.)?
Description : To achieve optimum cavity preparation, which of the following factors of internal anatomy must be considered in root canal treatment: A. Outline form B. The age and shape of pulp chamber; in ... root canals. C. Internal external relationship D. Intra-coronal preparation E. None of the above
Last Answer : B. The age and shape of pulp chamber; in addition to the direction of individual root canals.