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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.
Composition of FET The FET (field-effect transistor) can be constructed from several semiconductors, silicon being by far the most common. Several FETs are made with conventio
Explain priority interrupts of 8085. The 8085 microprocessor has five interrupt inputs. They are TRAP, RST .5, RST 6.5, RST 5.5, and INTR. These interrupts have a fixed prio
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Q. What is Induction machines? We shall first consider polyphase induction motors and then single-phase induction motors. The polyphase induction motors used in industrial appl
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Q. Two 1150:115-V transformers are to be inter connected for (a) 2300:230-V operation, and (b) 1150:230-V operation. Show the interconnections and appropriate polarity markings.
Determine the magnetic flux: A coil is wound uniformly with 300 turns over a steel ring of relative permeability 900, with a mean circumference of 40mm and cross-sectional are
Find the current flow through each resistor using mesh analysis for the circuit below. Step : Determine the number of common nodes and reference node within the network
Buffer A buffer is a logic circuit that amplifies the current or power. Basically it is used change the driving capability of a logical circuit. Therefore it is someti
how to model a doubly fed induction generator inside simulink?
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