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qdescribe some of the features hindering developing countries from growing fasteranswer one of the features that are able to be hold developing
q what do you mean by signal multipathsignal multipath occurs with electromagnetic wave propagation via sky wave in the hf range when the transmitted
q mode of propagation of electromagnetic wavesthe mode of propagation of electromagnetic waves in free space and atmosphere may be subdivided into
q explain wireless electromagnetic channelswireless electromagnetic channels are used in wireless communication systems in which the electromagnetic
q wire-line and fiber-optic channelwire-line channels are used extensively by the telephone network for voice data and video transmission
q digital communication systemstoday digital communication systems are in common use carrying the bulk of our daily information transmission through
the growth in communications over the past 60 years has been phenomenal the invention of the transistor in 1947 and the integrated circuit and laser
q explain about communication systemseven though most modern communication systems have only been invented and developed during the eighteenth and
alow-noise transducer is connected to an instrumentation system by a cable that generates thermal noise at room temperature the information-bearing
q illustrate signal attenuationsignal attenuation in many channels can be offset by using amplifiers to boost the signal level during transmission
q several forms of interferenceinterference may take several forms ac hum higher frequency pulses and whistles or erratic waveforms commonly known as
q what do you mean by interferencean information-bearing signal often becomes contaminated by externally generated interference and noise andor by
find the transmission bandwidth required of a data telemetry system that is to handle three different signals with bandwidths w1 1 khz w2 2 khz and
in order to demonstrate aliasing make a plot of the signalxt 3 cos 2pi10t - cos 2pi30twhich approximates a square wave with w 30 hz if the sample
q explain modulation and samplingmodulation is the process whereby the amplitude or another characteristic of a wave is varied as a function of the
a evaluate whether the sinusoidal signal xt a cos 2pif0t theta is an energy-type or a power-type signalb show that any periodic signal is not
q discuss the nature of sinusoidal signaldiscuss the nature of evenness and oddness ofa the sinusoidal signal xt a cos2pif0t thetab the complex
q explain periodic signals and fourier seriesin the study of analog systems predicting the response of circuits to a general time-varying voltage or
q explain source encoding or data compressionthe sequence of binary digits from the source encoder known as the information sequence is passed on to
q explain analog communication systemanalog signals in an analog communication system can be transmitted directly via carrier modulation over the
q show common signal-processing operationscommon signal-processing operations include the followingbull amplification to compensate for
q what do you mean by signal processingthe essential feature of communication control computation and instrumentation systems is the processing of
q show applications for dc machinesdc motors find wide applications in which control of speed voltage or current is essential shunt motors with
the following data apply to a 100-kw 250-v six-pole 1000-rmin long-shunt compound generator no-load rotational losses 4000 w armature resistance at
a 10-hp 230-v 500-rmin shunt motor having a full-load armature current of 37 a is started with a four-point starter the resistance of the armature