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1. Why must a modem be used to transmit binary data through a PSTN?
(1) Use sketches and additional text to describe the following modulation methods.
(a) Amplitude shift keying
(b) Frequency shift keying
(2) Discuss the factors that in?uence the choice of carrier frequency and the bandwidth used by the demodulator section of a modem.
Rectifiers As discussed above the purpose of the rectifier is to convert the incoming ac from a transformer or other ac source to some form of pulsating dc. That it i
Discuss in detail about pulse broadening in graded index waveguide ? Intermodal dispersion within multimode fibers is minimized along with the use of graded index fibers, ther
A balanced star-connected load is connected across a three phase 450V 50 Hz AC supply. Each load element has an impedance of 5+j12 Ω. Calculate: (i) The power factor of the
(a) contains a freewheeling diode Dm, commonly connected across an inductive load to provide a path for the current in the inductive load when the switch S is opened after time t (
What do you maent by Debugger? Debugger: This is a program that allows user to debug and test programs. All computers with microprocessor kits give debugging facility. To not
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You have a motor that is powered by 24 VDC. It free-runs at 600 radians/second, and stalls with a load of 125 in-lbs. The time constant (τ) of the motor itself is 1.5 seconds. T
What are the precautions to be taken before basic work on electrical installations? Ans: Before starting any electrical works on installations disconnect the power supply to
Q. What do you mean by Magnetic circuits? A magnetic circuit provides a path for magnetic flux, just as an electric circuit provides a path for electric current.Magnetic circui
Various compensation techniques
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