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Q. Explain Wireless electromagnetic channels?
Wireless electromagnetic channels are used in wireless communication systems, in which the electromagnetic energy is coupled to the propagation medium through an antenna that serves as a radiator. The physical size and configuration of the antenna depend mainly on the frequency of operation. For example, a radio station transmitting AM frequency band of 1 MHz (with a corresponding wavelength of λ = c/fc = 300 m) requires an antenna of at least 30 m (approximately one-tenth of the wavelength).
Define Sampling below the Nyquist Rate? A further reduction of the sampling frequency will reason one sample to be taken each period. The Case 3 plot depicts the effect of this
Q. Design the low-pass filter shown in Figure (by determining L) to have a half-power frequency of 10 kHz.
Fast Recovery diodes The fast recovery diodes low recovery times. These diodes are manufactured by diffusion. They are used in converter circuits where the speed of reco
Q. Sketch the timing diagram for a 4-bit ripple counter which uses T flip-flops.
A 1000-hp, 2300-V, wye-connected, three-phase, 60-Hz, 20-pole synchronous motor, for which cylindrical-rotor theory can be used and all losses can be neglected, has a synchronous r
Q. What is thermal runaway. The problem of self heating arises due to dissipation of power at the collector junction. The leakage current ICBO is extremely temperature dependen
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The Three-phase alternator In this case, three separate sets of coils are wound on the stator and connected to produce three separate outputs. Because of the physical displace
Q. Digital controller for a steam-turbine driven generator? Figure illustrates the basic elements of a minicomputer system in terms of a block diagram for speed and voltage con
LT Metering or Low Tension Metering The subsequent types of meters are generally used for LT consumers: Whole Current Meters i) Single phase meters ii) 3-phase
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