Communication Systems In case of low level amplitude modulation system, the amplifiers following the modulated stage must be Harmonic devices Non-linear devices Class C amplifiers Linear devices Harmonic devices Non-linear devices Class C amplifiers Linear devices ANSWER DOWNLOAD EXAMIANS APP
Communication Systems VSB modulation is preferred in TV because It reduces the bandwidth requirement to half It avoids phase distortion at low frequencies None of these It results in better reception It reduces the bandwidth requirement to half It avoids phase distortion at low frequencies None of these It results in better reception ANSWER DOWNLOAD EXAMIANS APP
Communication Systems When the length of antenna is a whole wavelength The radiation at right angles is maximum The radiation is zero in all directions The radiation at right angles is zero The radiation is maximum in all directions The radiation at right angles is maximum The radiation is zero in all directions The radiation at right angles is zero The radiation is maximum in all directions ANSWER DOWNLOAD EXAMIANS APP
Communication Systems To eliminate ghosts in the picture Use a longer transmission line Twist the transmission line Change the antenna orientation of location Connect a booster Use a longer transmission line Twist the transmission line Change the antenna orientation of location Connect a booster ANSWER DOWNLOAD EXAMIANS APP
Communication Systems If output power of a radio receiver is doubled, its volume is increased by __________ dB. 3 -3 1 2 3 -3 1 2 ANSWER DOWNLOAD EXAMIANS APP
Communication Systems In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then Amplitude of distant sidebands increases Amplitude of distant sidebands first increases, then decreases Amplitude of distant sidebands decreases Amplitude of distant sidebands remains constant Amplitude of distant sidebands increases Amplitude of distant sidebands first increases, then decreases Amplitude of distant sidebands decreases Amplitude of distant sidebands remains constant ANSWER DOWNLOAD EXAMIANS APP
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