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Q. Explain Radio and Television Broadcasting?
Radio (AM and FM) and television broadcasting are the most familiar forms of communication via analog transmission systems. The receiver most commonly used in AM radio broadcasting is the superheterodyne receiver, shown in Figure, which consists of a radio-frequency (RF) tuned amplifier, mixer, local oscillator, intermediate frequency (IF) amplifier, envelope detector, audio-frequency amplifier, and a loudspeaker. Tuning at the desired radio frequency fc is achieved by a variable capacitor, which simultaneously tunes the RF amplifier and the frequency fLO of the local oscillator. Every AM radio signal, in a superheterodyne receiver, is converted to a common IF frequency of fIF = |fc - fLO| = 455 kHz, which allows the use of a single tuned IF amplifier for signals from any radio station in the frequency band. Matching the bandwidth of the transmitted signal, the IF amplifier is set to have a bandwidth of 10 kHz.
what is the purpose of superposition theorem
mosfet
comment instruction for LIST p=18f4550
Now you have to digitally implement this circuit. Compute a difference equation which if you implement will behave exactly like this circuit.
Q. Consider a conducting loop of length l and width w, as shown in Figure, rotated about its axis (shown by the broken line) at a speed of ωm rad/s under the influence of a magneti
Q. Consider the circuit shown in Figure. Determine the current in the diode by assuming: (a) The diode is ideal. (b) The diode is to be represented by the model of Figure 7.2
Q. A four-pole dc generator is lap wound with 326 armature conductors. It runs at 650 r/min on full load, with an induced voltage of 252 V. If the bore of themachine is 42 cmin dia
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Explain piezoelectricity. Piezoelectricity: It gives us a means of converting electrical energy to mechanical energy and vice versa. While an electric field is applied to
Q. Mention the advantages and disadvantages of direct coupled coupling? Advantages: 1.Simple circuit due to minimum use of resistor 2.Low
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