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Q. Commercial FM radio broadcasting?
Commercial FM radio broadcasting utilizes the frequency band of 88 to 108 MHz for the transmission ofmusic and voice signals. The carrier frequencies are separated by 200 kHz, and the peak frequency deviation is fixed at 75 kHz. Each station (out of the possible 100) broadcasts in a channel bandwidth of 200 kHz centered on the carrier. The FM system is capable of presenting higher quality audio to the user than AM because of the larger audio band allowed from 50 Hz to 15 kHz. Distortion at most stations is below 1%. Besides broadcast applications, FM is also used in satellite links, aircraft altimetry, radars, amateur radio, and various two-way radio applications. Because of the larger bandwidth (up to 20 times more than in AM), an FM system has more freedom from interference and better performance in noise than any AM station.
Circuits, which provide sinusoidal waveforms, are but useful in themselves and form the basis of many other circuits, such as square and triangular waveform generators, and clocks.
Consider the RC circuit of Figure (a) with R = 2 ,C = 5F,and i(t) = I = 10 A (a dc current source). Find the expressions for the capacitor voltage vC(t) and the capacitor current
Q. The self-inductances of two coupled coils are L 11 and L 22 , and the mutual inductance between them is M. Show that the effective inductance of the two coils in series is give
National Tariff Policy or NTP In the draft of NTP, it is suggested that although setting the tariff ERC should introduce performance-based cost of service regulations, a clear
Q. What is Polyphase Induction Machine Performance? Some of the important steady-state performance characteristics of a polyphase induction motor include the variation of curre
Many circuits, particularly amplifiers, use negative feedback (nfb) in order to function reliably. The nfb changes the performance of the circuit to which it is applied, in most ca
Determine the response of a series R-C circuit to a SQUARE wave. Explain how the time constant affects the waveform observed across the components. Illustrate your answer by means
Q. What is a Modem? Modems are generally used to interface digital circuits to transmit information on analogue channels such as telephone systems. Modem (from modulator-demodu
(a) Consider the circuit of the noninverting amplifier in Figure, including an ideal op amp. Obtain an expression for the voltage gain of the overall circuit. (b) Let R i = 10
how does this circuit work and what are th electrical components in it do?
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