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 : ..................... 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 : _________can impair a signal. A) Attenuation B) Distortion C) Noise D) All of theabove
Last Answer : All of theabove
Description : The term modem is a composite word that refers to the two functional entities that make up the device: asignal _______ and a signal _______. A) modulator; demodulator B) demodulator; modulator C) modern;demo D) none of the above
Last Answer : modulator; demodulator
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 : The random and unpredictable electric signal from natural causes, both internal and external to the system is know as ________. A. Distortion B. Noise C. Attenuation D. Interference
Last Answer : B. Noise
Description : Sources of impulse noise induced in communication channels. A. Erroneous digital coding bit caused by an error on a transmission facility B. Transients due to relay operation C. Crosstalk from dc signaling systems D. All of these
Last Answer : D. All of these
Description : The Nyquist theorem specifies the minimum samplingrate to be_______. A) equal to the lowest frequency of asignal B) equal to the highest frequency ofa signal C) twice thebandwidth of a signal D) twice thehighest frequencyof a signal
Last Answer : twice thehighest frequencyof a signal
Description : Phenomena in which signal transmitted in one circuit creates undesired effect in other circuit is known as A. crosstalk B. signal attenuation C. sampling D. crosslinking
Last Answer : crosslinking
Description : The most common typeof storage devices are– (A) persistent (B) optical (C) magnetic (D) flash (E) steel
Last Answer : flash
Description : Attenuation and noise can impair a signal. True False
Last Answer : True
Description : The .............. measures the relative strengths of two signals or a signal at two different points. (A) frequency (B) attenuation (C) throughput (D) decibel
Last Answer : (D) decibel
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 : Crosstalk due to incomplete suppression of sidebands or to intermodulation of two or more frequency-multiplexed channels which is unintelligible is classified as A. Impulse noise B. Thermal noise C. Quantizing noise D. Miscellaneous noise
Last Answer : D. Miscellaneous noise
Description : Noise that occurs via capacitive or inductive coupling in a cable. A. Crosstalk B. Quantizing noise C. Reference noise D. Tone interference
Last Answer : A. Crosstalk
Description : Noise occurring in the presence of signal resulting from a mismatch between the exact value of an analog signal and the closet available quantizing step in a digital coder. A. Quantizing noise B. Thermal noise C. Impulse noise D. Crosstalk
Last Answer : A. Quantizing noise
Description : An interfering current in a telegraph or signaling channel due to telegraph or signaling current by another channel. A. Crosstalk B. Noise current C. Crossfire D. Intermodulation
Last Answer : C. Crossfire
Description : What progressive reform most directly encouraged ending terms for corrupts elected officials?
Last Answer : Use of recall
Description : The unit of noise pollution (level) is – (1) decibel (2) decimal (3) ppm (4) None of these
Last Answer : (1) decibel Explanation: Noise pollution refers to any unpleasant, damaging or irritating noise that has the potential to harm people, wildlife or the environment. The decibel (dB) is the main unit used ... can also be measured. by its pitch, which is the frequency of sound vibrations per second.
Description : Noise is measured in – (1) Watt (2) REM (3) Centigrade (4) Decibel
Last Answer : (4) Decibel Explanation: The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in ... from their roosts in caves, attics, or trees at dusk and hunt for insects into the night.
Description : The unit of measurement of noise is – (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics
Last Answer : (1) Decibel Explanation: The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One ... one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
Description : A decibel is – (1) A musical instrument (2) The wavelength of noise (3) A musical note (4) A measure of sound level
Last Answer : (4) A measure of sound level Explanation: The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference ... ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities.
Description : Noise pollution level in a chemical plant is expressed in (A) Roentgen (B) Decibel (C) Hertz (D) None of these
Last Answer : (B) Decibel
Description : The unit of measurement of noise is (1) Decibel (2) Hertz (3) Amplifier (4) Acoustics
Last Answer : Decibel
Description : The unit of noise pollution (level) is : (1) decibel (2) decimal (3) ppm (4) None of these
Last Answer : decibel
Description : Noise is measured in (1) Watt (2) REM (3) Centigrade(4) Decibel
Description : A decibel is (1) a musical instrument (2) the wavelength of noise (3) a musical note (4) a measure of sound level
Last Answer : a measure of sound level
Description : Which of the following is an advantage to using fiber optics data transmission? a. resistance to data theft b. fast data transmission rate c. low noise level d. all of above
Last Answer : fast data transmission rate
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 : Block coding can help in _______at the receiver. A) Synchronization B) Error detection C) Attenuation D) (a) and (b)
Last Answer : (a) and (b)
Description : Which of the following summation operations is performed onthe bits to checkanerror-detecting code? A. Codec B. Coder-decoder C. Checksum D. Attenuation
Last Answer : Checksum
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 : _______ control refers to aset of proceduresused torestrict the amount ofdata that the sender can send before waiting foracknowledgment. A) Flow B) Error C) Transmission D) none of the above
Last Answer : Flow
Description : The word______ refers to the portion of a _______ that carriesa transmission. A) channel; link B) link; channel C) line; channel D) line; link
Last Answer : channel; link
Description : Inasynchronous transmission, the gap time between bytes is _______. A) fixed B) variable C) afunctionof the data rate D) zero
Last Answer : variable
Description : In _______ transmission, the channel capacity is shared byboth communicatingdevices at all times. A) simplex B) half-duplex C) full-duplex D) half-simplex
Last Answer : full-duplex
Description : The _______ layer ensures reliable transmission on a single link A. network B. physical C. data link D. transport
Last Answer : C. data link
Description : Explain sizeof and typeof.
Last Answer : typeof obtains the System.Type object for a type and sizeof obtains the size of a type.
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 : 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 : Which of the following term best described the overload distortion? A. Peak limiting B. Quantization noise C. Granular noise D. Slope distortion
Last Answer : A. Peak limiting
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 : What is the reason why companding is employed in PCM systems? A. To overcome impulse noise in PCM receivers B. To allow amplitude limiting in the receivers C. To solve quantizing noise problem D. To protect small signals in PCM from quantizing distortion
Last Answer : D. To protect small signals in PCM from quantizing distortion
Description : Which of the following contributes to harmonics distortion in amplifiers? A) Positive feedback B) Presence of noise C) Defective active device D) Non linearity in active device.
Last Answer : D) Non linearity in active device.
Description : Popular measures of distortion is a. Squared error measure b. Absolute difference c. Noise d. Nats
Last Answer : a. Squared error measure
Description : The rate for a discrete source is simply the______. a. Entropy b. Loss c. Noise d. Distortion
Last Answer : a. Entropy
Description : Man-made noise is usually from _______. A. transmission over power lines and by ground wave B. sky-wave C. space-wave D. troposphere
Last Answer : A. transmission over power lines and by ground wave
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 : 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.