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A modem using phase shift keying (PSK) technique in signal transmission.
i) Identify the PSK type and calculate the bandwidth if the modem is transmitting with 9600bps and 2400 baud.
ii) Suggest a way to reduce the baud rate to 1200 baud and calculate the new bandwidth.
Determine the Voltage across the electrical model of a cell membrane in a nerve cell
A coil wound around a ferromagnetic core is supplied by a 120V, 25 Hz source. Determine the percent change in eddy-current loss if the coil is connected to a 60Hz source with the same flux density.
A 4800/480 volt, single phase transformer is rated at 75KVA. test results performed for rated power showed the following. short circuit test V=80v, P= 2470W, I= Rated current open circuit test V= 480v, I=4Amp, P=616W
A modulator transmits symbols, each of which has 64 different possible states, 15,000 times per second. Calculate the baud rate and the bit rate.
The reliability of a certain automatic cutoff device is assumed 11/12. What is the reliability of a system consisting of 4 such devices so arranged
A 230 V DC series motor has an armature circuit resistance of 0.2 and a eld circuit resistance of 0.1. At rated voltage, the motor draws a line current of 40A and runs at a speed of 1000 rpm.
A long copper wire of circular cross-section and resistance 0.05 O has a potential difference of 0.10 V applied across its ends. The wire is then melted and reformed into a wire of circular cross-section that is twice as long.
A transconductance amplifier with Ri = 2 kΩ, Gm = 40 mA/V , and Ro = 20kΩ is fed with a voltage source having a source resistance of 2kΩ and is loaded with a 1kΩ resistance. Find the voltage gain realized (from the source internal voltage to the o..
A 600V, dc shunt motor has an armature and field resistance of 1.5 ohm and 600 ohm, respectively. When the motor runs unloaded, the line current is 3A, and the speed is 1000 rpm.
Develop a comparator circuit that takes two 2-bit operands (A and B, or A1 A0 and B1 B0) and gives a single bit output if A>B. Show the truth table for the circuit, K-map, and the circuit implementation. How would you extend your solution to build..
A hydroelectric power plant has a synchronous generator who's speed must be fixed at 180 r/min. The turbine is Pelton type with 10 m runner diameter. When the flow rate at the nozzle of the penstock is 10m^3/s, the generated electricity.
Select an appropriate QAM signal constellation, carrier frequency, and the roll-off factor of a pulse with a raised cosine spectrum that utilizes the entire frequency band. Sketch the system block diagram and the spectrum of the transmitted signal..
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