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A three phase Y-connected induction motor operates at 220 volts, has a power factor of 75% and an efficiency of 84% when delivering 8HP. a) what is the current in any one of the phase windings? b) what is the voltage across each of the phase windings?
The RS-232 serial port on a personal computer is transmitting 2400-bit/sec data using a polar NRZ line code that has a peak value of 12 V. Assume that binary 1's and 0's are equally likely to occur.
An amplifier operates from -5V and +5V balanced power supplies. It provides a 3.2-Vpeak sine across a 150 ohm load when provided with a 0.2-V peak input from which 2.0mA peak is drawn. The average current in each supply is 20mA.
A system samples a sinusoid of frequency 850 Hz at a rate of 250 Hz and writes the sampled signal to its output without further modification. Determine the frequency that the sampling system will generate in its output.
A 60-Hz, single phase source with V= 277 at angle 30 degree volts is applied to a circuit element. Determine the instanaeous power, real power, and reactive power absorbed by determine the source power factor and state lagging or leading.
Find the permittivity of a parallel-plate capacitor if its capacitance is 100 ?F, the dimension of each rectangular plate is 1cm by 0.5cm, and the distance between the plates is 1mm.
A heat engine operating in outer space may be assumed equivalent to a Carnot engine operating between reservoirs at temperatures TH and Tc The only way heat can be discarded from the engine is by radiation
A 35-year old female worker receives an x-ray exposure of 5.2 rad (whole-body) while carrying out emergency procedures in a nuclear accident. Discuss the health risks assumed by this worker as a result of the radiation exposure.
Research coal deposits in the USA and US coal mine production. Approximately, what was the US annual production of coal from mines in recent years What was the coal production of the Appalachian or Eastern province
An AM signal is written as xc(t) = Ac (1+ µx(t))cos(2pi*fc*t) where fc is the carrier frequency, Ac is the carrier amplitude, µ is the modulation index, and x(t) is the baseband message signal. We assume that x(t) has absolute bandwidth W
If a stepper motor has a step-angle of 7.5? , what digital input rate is required to produce a rotation of 10 rev/sec What will be the step-angle for a hybrid stepper motor with eight stator windings and ten rotor teeth
Dynamic RAM that must be given a refresh cycle 64 times per ms. Each refresh operation requires 150 ns. memory cycle requires 250 ns.
Interface TTL logic to 120 VAC lamp. In this part of the lab, you will interface lowpower solid state electronics to the "outside world" by switching the 120 VAC lamp on and off using the AND gate from the previous experiment.
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