The main function of a balanced modulator is to Suppress carrier signal in order to create a single-sideband or double sideband Produce balanced modulation of a carrier wave Limit noise picked by a receiver Produce 100% modulation TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is an indirect way of generating FM? Reactance FET modulator Reactance bipolar transistor Armstrong modulator Varactor diode modulator TRUE ANSWER : ? YOUR ANSWER : ?
SSB can be generated by Phase cancellation method Filter method All of these Good attenuation characteristics TRUE ANSWER : ? YOUR ANSWER : ?
Under ordinary circumstances, impulse noise can be reduced in Both AM and FM None of these AM only FM only TRUE ANSWER : ? YOUR ANSWER : ?
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 decreases Amplitude of distant sidebands increases Amplitude of distant sidebands first increases, then decreases TRUE ANSWER : ? YOUR ANSWER : ?
The disadvantage of FM over AM is that High output power is needed Large bandwidth is required High modulating power is needed Noise is very high for high frequency TRUE ANSWER : ? YOUR ANSWER : ?
VSB modulation is preferred in TV because It reduces the bandwidth requirement to half It results in better reception None of these It avoids phase distortion at low frequencies TRUE ANSWER : ? YOUR ANSWER : ?
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as 6E 3E 2E 4E TRUE ANSWER : ? YOUR ANSWER : ?
Fourier analysis indicate that a square wave can be represented as Fundamental and subharmonic sine waves A fundamental sine wave and even harmonics A fundamental sine wave and harmonics A fundamental sine wave and odd harmonics TRUE ANSWER : ? YOUR ANSWER : ?
DVD uses Laser beam for recording and video head for playback Laser beam for both recording and playback Video head for recording and laser beam for playback None of these TRUE ANSWER : ? YOUR ANSWER : ?