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Q. Explain The Input Characteristics Of Common Emitter Configuration?Input characteristics:In the figure the abscissa is the base current IB, The ordinate is the base to emitter voltage VBE, and the curves are given for various values of collector to emitter voltage VCE. We observe that, with the collector shorted to the emitter and the emitter forward biased, the input characteristics is essentially that of a forward biased diode. If VBE becomes 0,then IB will be 0,since under these conditions both emitter and collector junctions will be short circuited. In general increasing VCE with constant VBE causes a decrease in base width WB' and results in a decreasing recombination base current. These considerations account for the input characteristics.
The field winding of a 200 V d.c. machine has a resistance of 20? and an inductance of 500mH. Calculate: (a) The time constant of the field winding (b) The value of curr
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a) In the United States, the Federal Communications Commission (FCC) is charged with the regulation of radio and wire communication (FCC part 15). It basically sets limits on the
Question 1 (a) Describe the functions of the modulator and source encoder in a digital communications system. (b) By using appropriate examples, distinguish between th
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The expression given in Problem for (S 0 /N 0 )PCM is plotted for a sinusoidal message in Figure to show the performance curves for a PCM system using a polar waveform. (a) Comm
Explain the factors affecting permeability and hysterisis loss. Factors affecting permeability and hysterisis loss: When the initial permeability is high, the hysterisis los
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Q. Consider an ampli?er as a voltage source with an internal resistance of 72 . Find the turns ratio of the ideal transformer such that maximum power is delivered when the ampli?e
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