Description : What two properties of the launch condition may affect multimode fiber attenuation measurements?
Last Answer : . Launch spot size and angular distribution.
Description : What three factors must be considered in the transmission of a surface wave to reduce attenuation?
Last Answer : (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna
Description : What connection properties result in fiber optic connector coupling loss?
Last Answer : Poor fiber alignment and end preparation, fiber mismatches, and Fresnel reflection.
Description : Under normal condition, a single fiber should not be used for a two-way communication mainly because of ∙ a. Loss ∙ b. Fading ∙ c. Noise ∙ d. Attenuation
Last Answer : ∙ c. Noise
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 : 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 : 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 : Modal dispersion affects the bandwidth of multimode systems. It is essential to adjust what three fiber properties to maximize system bandwidth?
Last Answer : Core diameter, NA, and index profile properties.
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 : Does underfilling a multimode optical fiber excite mainly high-order or low-order modes?
Last Answer : Low-order modes.
Description : Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its (A) High strength to weight ratio (B) Low temperature strength properties (C) Its ability ... rolled, forged & stamped (D) High strength and corrosion & oxidation-resistance at elevated temperature
Last Answer : (A) High strength to weight ratio
Description : 1. By which algae is Nitrogen fixation done? 2. Which post does the Constitution of India not mention? 3. When do all the magnetic materials lose their magnetic properties? 4. Why are the ... belongs to which mountains? 20. During the reign of emperor was the artillery most perfect and numerous?
Last Answer : Answer : 1. Blue-green algae 2. The Deputy Prime Minister 3. Strongly heated 4. For inland navigation 5. Alberuni 6. 5th June 7. Manipur 8. Analogous organs 9. Oxbow lake 10. Vallabhacharya 11 ... 17. Due to presence of Bacteriophages 18. As a Union of States 19. Fold mountains 20. Aurangzeb
Description : Ferrite devices are useful in microwave applications because they possess what properties?
Last Answer : Magnetic properties and high resistance
Description : What is the smallest particle into which an element can be broken down and still retain all its original properties?
Last Answer : The atom.
Description : Quality fiber-end preparation is essential for proper system operation. What properties must an optical fiber-end face have to ensure proper fiber connection?
Last Answer : Be flat, smooth, and perpendicular to the fiber axis.
Description : List seven properties cable jackets should have.
Last Answer : Low smoke generation, low toxicity, low halogen content, flame retardance, fluid resistance, high abrasion resistance, and stable performance over temperature.
Description : What four fiber properties determine the number of modes propagating in a multimode gradedindex fiber?
Last Answer : Numerical aperture (NA), relative refractive index difference ( D), profile parameter (α), and normalized frequency (V).
Description : The amount of backscattered optical power at each point depends on what two properties?
Last Answer : Forward optical power and backscatter capture coefficient.
Description : State two fundamental properties of insulating materials.
Last Answer : Insulation resistance and dielectric strength.
Description : The various properties of a transmitting antenna can apply equally to the same antenna when it is used as a receiving antenna. What term is used for this property?
Last Answer : Reciprocity of antennas.
Description : Suppuration is mainly the result of the combined action of four factors; which of the following is not one of these factors?CHECK A. Necrosis B. Presence of lymphocytes C. Collection of neutrophils D. Accumulation of tissue fluid E. Autolysis by proteolytic enzymes
Last Answer : B. Presence of lymphocytes
Description : What is the result of an abrupt change in the size, shape, or dielectric of a waveguide?
Last Answer : Reflections.
Description : What is the result of an impedance mismatch in a waveguide?
Last Answer : Standing waves that cause power losses, a reduction in power handling capability, and an increase in frequency and sensitivity.
Description : What is the result of pulsing a pulsed rf amplifier when no rf is present?
Last Answer : Oscillations at an undesired frequency.
Description : What is the result of an impedance mismatch between a receiver or transmitter and its transmission line or antenna?
Last Answer : High vswr, which equates to poor reception or a loss of power output.
Description : What is the result of applying power to a calorimeter?
Last Answer : As power is applied, the medium heats up in proportion to the applied power.
Description : Does coupling loss from refractive index profile difference result when the receiving fiber has a larger profile parameter
Last Answer : Fiber alignment.
Description : Why does using ac vice dc bias voltage result in a stronger output signal?
Last Answer : Because an ac bias voltage of the proper frequency and level places the input signal away from both steps in the magnetism curve. The result is two undistorted output signals that are combined into one strong output.
Description : Why does adding dc vice ac bias voltage to the input signal result in a poor signal-to-noise ratio (SNR)?
Last Answer : With dc bias, the SNR is poor because only a small portion of the magnetism curve is straight enough to use, thus the output signal is weak compared with the natural tape hiss.
Description : What capability allows the arithmetic/logic section to test various conditions encountered during processing and take action based on the result?
Last Answer : Logic.
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 : What is attenuation ?
Last Answer : Natural behavior of an organism without causing disease is called attenuation i.e. reducing pathogenesity of the organism.
Description : Which of the following parameters is not a primary parameter? a) Resistance b) Attenuation constant c) Capacitance d) Conductance
Last Answer : Ans: B
Description : A special request originated from some device to the CPU to acquire some of its time is called ___________ a) Disturbance b) Attenuation c) Interrupt d) Noise
Last Answer : Answer: c Explanation: An interrupt is a kind of request which takes control of the system bus for some time, then performs all the operations and gives back control to the CPU. It is usually identified by some number and is handled by the interrupt controller
Description : The upper pulse rate and information carrying capacity of a cable is limited by a. Pulse shortening b. Attenuation c. Light leakage d. Modal dispersion
Last Answer : d. Modal dispersion
Description : Which of the cable length has the highest attenuation? a. 1 km b. 2 km c. 95 ft d. 5500 ft
Last Answer : b. 2 km
Description : Cable attenuation is usually expressed in terms of a. Loss per foot b. dB/km c. intensity per mile d. voltage drop per inch
Last Answer : b. dB/km
Description : The loss in signal power as light travels down a fiber is called a. Dispersion b. Scattering c. Absorption d. Attenuation
Last Answer : d. Attenuation
Description : What is the free space attenuation of a satellite communications system operating at 36,000 km above the earth at 5.0 GHz? A. 198 dB B. 202 dB C. 142 dB D. 138 dB
Last Answer : A. 198 dB
Description : _________ is the random and unpredictable electric signals from natural causes, both internal and external to the system. A. Interference B. Attenuation C. Distortion D. Noise
Last Answer : D. Noise
Description : What is the required quality factor for an SSB filter with the following data: center frequency= 1 MHz, the desired attenuation level of the unwanted sideband= 80 dB and the separation between sidebands= 200 Hz? A. 1,250 B. 12,500 C. 125,000 D. 25,000
Last Answer : C. 125,000
Description : Atmospheric attenuation is an attenuation which is due to A. mist and fog B. gasses in the atmosphere C. water vapor and oxygen D. rain
Last Answer : C. water vapor and oxygen
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 : 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 : What is the current frequency band given most attenuation for satellite communications? A. Ku B. C band C. J D. P
Last Answer : A. Ku
Description : What is the path attenuation between transmitter and receiver at a frequency of 1.2 Ghz and a distance of 11,000 mi? A. 119 dB B. 115dB C. 179dB D. 174dB
Last Answer : C. 179dB