Communication Systems In Modulation, “carrier” is Speech voltage to be transmitted Resultant wave Voltage for which frequency, phase or amplitude is varied Voltage with constant frequency, phase or amplitude Speech voltage to be transmitted Resultant wave Voltage for which frequency, phase or amplitude is varied Voltage with constant frequency, phase or amplitude ANSWER DOWNLOAD EXAMIANS APP
Communication Systems In EM waves, polarization Is due to transverse nature of waves Is always vertical in an isotropic medium Results from longitudinal nature of waves Is caused by reflection Is due to transverse nature of waves Is always vertical in an isotropic medium Results from longitudinal nature of waves Is caused by reflection ANSWER DOWNLOAD EXAMIANS APP
Communication Systems For telegraphy the most commonly used modulation system is Single tone modulation Two tone modulation FSK PCM Single tone modulation Two tone modulation FSK PCM ANSWER DOWNLOAD EXAMIANS APP
Communication Systems The modulation index of an FM is changed from 0 to 1. How does the transmitted power change? Gets halved Remains unchanged Gets doubled Gets increased by 50 percent Gets halved Remains unchanged Gets doubled Gets increased by 50 percent 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 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 Which of the following is used to generate PDM? Monostable multi-vibrator Free running multi-vibrator Schmitt trigger JK flip-flop Monostable multi-vibrator Free running multi-vibrator Schmitt trigger JK flip-flop ANSWER DOWNLOAD EXAMIANS APP
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