Description : The range of speech power is ____. A. 1 – 10 watts B. 100 – 1000 milliwatts C. 10 – 100 milliwatts D. 10 – 1000 microwatts
Last Answer : 10 – 1000 microwatts
Description : Television signals are converted into light signals by------? A. Optical fiber B. Transistor C. Decoder D. Photo diode (Answer) E. None of these
Last Answer : D. Photo diode (Answer)
Description : Which of the following uses a very thin glass or plastic fiber through which pulses of light travel? a. Cat 1 b. Optical fiber c. Twisted pair d. Coax
Last Answer : b. Optical fiber
Description : Construction and function of a light emitting diode (LED)
Last Answer : A light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed through it. The construction of an LED consists of several layers of semiconductor materials, ... to make the semiconductor layers, as well as the energy band gap of the semiconductor material.
Description : LED technology is energy efficient. What does LED stand for? A. Low Energy Data B. Low Energy Diode C. Light Emitting Diode 107 D. None of these
Last Answer : ANSWER: C
Description : LED technology is energy efficient. What does LED stand for? A. Low Energy Data B. Low Energy Diode C. Light Emitting Diode D. None of these
Description : LED stands for _________ A. Low Emission Display B. Liquid Emitting Display C. Less Emitting Diode D. Light Emitting Diode
Last Answer : D. Light Emitting Diode
Description : Figure 'C' shown in the illustration represents a _________. EL-0078 A. silicon controlled rectifier B. light emitting diode C. photosensitive diode D. Zener diode
Last Answer : Answer: C
Description : Figure 'D' shown in the illustration represents a _________. EL-0067 A. silicon controlled rectifier B. light emitting diode C. photosensitive diode D. Zener diode
Last Answer : Answer: B
Description : It is the made from semiconductor material such as aluminum-galium-arsenide or gallium-arsenide-phosphide. A. APD B. Injection laser diode C. Light emitting diode D. Positive-intrinsic-negative
Last Answer : C. Light emitting diode
Description : Which of the following sensor make use of light emitting diode?A : Sonar B : Radar C : Infrared D : Laser Rangefinder
Last Answer : C : Infrared
Description : Which of the following sensor make use of light emitting diode? A : Sonar B : Radar C : Infrared D : Laser Rangefinder
Description : LED stands for: a) Level Engaged Diode b) Light Emitting Diode c) LAN Enabled Diode d) None of These
Last Answer : b) Light Emitting Diode
Description : Light Emitting Diode (LED) converts?
Last Answer : Electrical energy into light energ
Description : A light emitting diode emits light only when (a) Reversed biased (b) forward biased (c) unbiased (d) none
Last Answer : (b) forward biased
Description : A light emitting diode (L.E.D.) can be made from:
Last Answer : Different compound use to get various colors Ex:- GaAs (gallium arsenide) > infared GaAsP (gallium arsenide phosphide) > Red, gallium(III) phosphide > green, InGaN (Indium gallium nitride) > Blue
Description : An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio? A. 100:01:00 B. 500:01:00 C. 1000:01:00 D. 5000:01:00
Last Answer : Answer: A
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 : Which of the following is used as an optical transmitter on the Fiber Optical Communications? a. APD b. LSA diode c. PIN diode d. LED
Last Answer : d. LED
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
Description : Which of the following is used as an optical transmitter on the Fiber Optical Communications? ∙ a. APD ∙ b. LSA diode ∙ c. PIN diode ∙ d. LED
Description : The term responsivity as it applies to a light detector is best described as ∙ A. the time required for the signal to go from 10 to 90 percent of maximum amplitude ∙ B. the ratio of the diode ... . the ratio of the input power to output power ∙ D. the ratio of output current to input current
Last Answer : the ratio of the diode output current to the input optical power
Description : What type of communication media is the most widely usedcabling for data transfer today? A) Cat 5 B) Twisted pair C) Coaxial D) Optical fiber
Last Answer : Cat 5
Description : The inner core ofan optical fiber is _______ in composition. A) glass or plastic B) copper C) bimetallic D) liquid
Last Answer : glass or plastic
Description : In an optical fiber, the inner coreis _______ the cladding. A) denser than B) less dense than C) the samedensityas D) another name for
Last Answer : denser than
Description : The physical layer provides __________ a. mechanical specifications of electrical connectors and cables b. electrical specification of transmission line signal level c. specification for IR over optical fiber d. all of the mentioned
Last Answer : d. all of the mentioned
Description : Which transmission media provides the highest transmission speed in a network? a. coaxial cable b. twisted pair cable c. optical fiber d. electrical cable
Last Answer : c. optical fiber
Description : Identify the non suitable medium for 802.3 ethernet? a. A thin coaxial cable b. A twisted pair cable c. A microwave link d. A fiber optical cable
Last Answer : c. A microwave link
Description : Maximum data transfer rate of the optical fiber is……….? a. 50 kbps b. 1000 kbps c. 1000 Mbps d. None of the these
Last Answer : c. 1000 Mbps
Description : The main hardware components of a graphics workstation are …………… A. Thick coax, optical fiber B. twisted pair , thin coax C. twisted, optical fiber D. Thick coax, Thin coax
Last Answer : D. Thick coax, Thin coax
Description : The physical layer provides __________ A. mechanical specifications of electrical connectors and cables B. electrical specification of transmission line signal level C. specification for IR over optical fiber D. all of the mentioned
Last Answer : D. all of the mentioned
Description : What specifications does physical layer provides __________. A. mechanical specifications of electrical connectors and cables B. electrical specification of transmission line signal level C. specification for IR over optical fiber D. all of the mentioned
Description : Which of the following cannot be used as a medium for 802.3 ethernet? a) A thin coaxial cable b) A twisted pair cable c) A microwave link d) A fiber optical cable
Last Answer : c) A microwave link
Description : What kind of transmission medium is most appropriate to carry data in a computer network that is exposed to electrical interferences? a) Unshielded twisted pair b) Optical fiber c) Coaxial cable d) Microwave
Last Answer : b) Optical fiber
Description : Which of this is not a guided media? a) Fiber optical cable b) Coaxial cable c) Wireless LAN d) Copper wire
Last Answer : c) Wireless LAN
Description : The physical layer provides __________ a) mechanical specifications of electrical connectors and cables b) electrical specification of transmission line signal level c) specification for IR over optical fiber d) all of the mentioned
Last Answer : d) all of the mentioned
Description : Which transmission media provides the highest transmission speed in a network? a) coaxial cable b) twisted pair cable c) optical fiber d) electrical cable
Last Answer : c) optical fiber
Description : The inner core of an optical fiber is in composition. a. copper b. liquid c. glass or plastic d. bimetallic
Last Answer : c. glass or plastic
Description : An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be
Last Answer : An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be 2 watts
Description : In Bluetooth, theL2CAP sublayer, is roughly equivalent to the LLC sublayer inLANs. A) radio B) baseband C) L2CAP D) none of the above
Last Answer : L2CAP
Description : In Bluetooth, the_______ layer is roughly equivalent to thephysical layer of theInternet model. A) radio B) baseband C) L2CAP D) none of the above
Last Answer : radio
Description : Optical cable testers are used for ∙ a. Checking refractive index ∙ b. Light power out of a fiber ∙ c. Non-calibrated light into a fiber
Last Answer : b. Light power out of a fiber
Last Answer : ∙ b. Light power out of a fiber
Description : The loss in signal power as light travels down the fiber is called a. attenuation b. progragation c. scattering d. interruption
Last Answer : attenuation
Description : The loss in signal power as light travels down the fiber is called ............. A) Attenuation B) Propagation C) Scattering D) Interruption
Last Answer : A) Attenuation
Description : Is a non-coherent light source foe optical communications system. a. ILD b. LED c. APD d. PIN Diode
Last Answer : b. LED
Description : A non-coherent light source for optical communications system. A. PIN Diode B. ILD C. APD D. LED
Last Answer : D. LED