Communication Systems In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then Amplitude of distant sidebands remains constant Amplitude of distant sidebands increases Amplitude of distant sidebands decreases Amplitude of distant sidebands first increases, then decreases Amplitude of distant sidebands remains constant Amplitude of distant sidebands increases Amplitude of distant sidebands decreases Amplitude of distant sidebands first increases, then decreases ANSWER DOWNLOAD EXAMIANS APP
Communication Systems A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is 1 16 15 8 1 16 15 8 ANSWER DOWNLOAD EXAMIANS APP
Communication Systems An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are 200 and 10.01 200 and 1.01 200 and 100.1 200 and 200 200 and 10.01 200 and 1.01 200 and 100.1 200 and 200 ANSWER DOWNLOAD EXAMIANS APP
Communication Systems One of the advantages of base modulation over collector modulation of a transistor class C amplifier is Better linearity Improved efficiency The lower modulating power requirement High power output per transistor Better linearity Improved efficiency The lower modulating power requirement High power output per transistor ANSWER DOWNLOAD EXAMIANS APP
Communication Systems What is the purpose of peak clipper circuits in radio transmitters? To regulate oscillator I/P voltage To reduce bandwidth To increase bandwidth To prevent overmodulation To regulate oscillator I/P voltage To reduce bandwidth To increase bandwidth To prevent overmodulation ANSWER DOWNLOAD EXAMIANS APP
Communication Systems In Pulse Code Modulation system Quantising noise can be reduced by decreasing the number of standard levels Large bandwidth is required Quantising noise can be overcome by companding Suffers from the disadvantage of its incompatibly with TDM Quantising noise can be reduced by decreasing the number of standard levels Large bandwidth is required Quantising noise can be overcome by companding Suffers from the disadvantage of its incompatibly with TDM ANSWER DOWNLOAD EXAMIANS APP
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