Communication Systems The characteristic impedance of a twin wire feeder used for TV signals is about 300 ohm 100 ohm 1000 ohm 500 ohm 300 ohm 100 ohm 1000 ohm 500 ohm ANSWER DOWNLOAD EXAMIANS APP
Communication Systems When the length of antenna is a whole wavelength The radiation at right angles is maximum The radiation at right angles is zero The radiation is maximum in all directions The radiation is zero in all directions The radiation at right angles is maximum The radiation at right angles is zero The radiation is maximum in all directions The radiation is zero in all directions ANSWER DOWNLOAD EXAMIANS APP
Communication Systems FM transmitting and receiving equipment as compared to AM equipment is None of these Almost equally costly Cheaper Costly None of these Almost equally costly Cheaper Costly ANSWER DOWNLOAD EXAMIANS APP
Communication Systems Which of the following does not cause losses in optical fibre cables? Attenuation in glass Stepped index operation Microbending Impurities Attenuation in glass Stepped index operation Microbending Impurities 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 Gets doubled Remains unchanged Gets increased by 50 percent Gets halved Gets doubled Remains unchanged Gets increased by 50 percent 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
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