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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.
Q. An n-channel enhancement MOSFET operates in the active region with very large V A , v GS = 6V, V = 4 V, and i = 1 mA. Calculate K.
Q. Explain Position servo in a radar system? Figure depicts the essential elements of a position servo system. In a radar system, an electromagnetic pulse is radiated from an a
Determine Potential Difference: Compute the current through each element of the given network and also determine potential difference across 15 Ω resistor. Figure
Q. Basic Characteristics and Operation of MOSFET ? In Figure the gate-to-source voltage is set to zero volts by the direct connection from one terminal to the other, and a volt
observation on superposition theorem
Need answers of a question bank of power electronics . It is an assignment. Urgent
Q. A two-winding system has its inductances given by where k 1 and k 2 are constants. Neglecting the winding resistances, derive an expression for the electric force when
A 3 phase 60 hertz induction motor has 8 poles and operates with a slip of .05 for a certain load. Compute in r.p.m. the (a) Speed of the rotor with respect to the stator, (b
With neat diagrams explain the configuration of a step-by-step switching system. Schematic diagram for such an exchange is given in Figure. Every subscriber is connected to a
Semiconductor Equations The semiconductor equations that are relating these variables are shown below: Carrier density: n = n i exp (E FN - E i / KT) (1)
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