Communication Systems If output power of a radio receiver is doubled, its volume is increased by __________ dB. -3 2 3 1 -3 2 3 1 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 100.1 200 and 200 200 and 1.01 200 and 10.01 200 and 100.1 200 and 200 200 and 1.01 200 and 10.01 ANSWER DOWNLOAD EXAMIANS APP
Communication Systems In case of low level amplitude modulation system, the amplifiers following the modulated stage must be Harmonic devices Class C amplifiers Linear devices Non-linear devices Harmonic devices Class C amplifiers Linear devices Non-linear devices ANSWER DOWNLOAD EXAMIANS APP
Communication Systems The main function of a balanced modulator is to Suppress carrier signal in order to create a single-sideband or double sideband Produce 100% modulation Produce balanced modulation of a carrier wave Limit noise picked by a receiver Suppress carrier signal in order to create a single-sideband or double sideband Produce 100% modulation Produce balanced modulation of a carrier wave Limit noise picked by a receiver ANSWER DOWNLOAD EXAMIANS APP
Communication Systems DVD uses Video head for recording and laser beam for playback Laser beam for both recording and playback None of these Laser beam for recording and video head for playback Video head for recording and laser beam for playback Laser beam for both recording and playback None of these Laser beam for recording and video head for playback ANSWER DOWNLOAD EXAMIANS APP
Communication Systems The modulation index of an FM is changed from 0 to 1. How does the transmitted power change? Remains unchanged Gets halved Gets doubled Gets increased by 50 percent Remains unchanged Gets halved Gets doubled Gets increased by 50 percent ANSWER DOWNLOAD EXAMIANS APP
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