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Explain the theory on PZT materials and mechanical resonance
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A group of small appliances on a 60Hz system requires 20 kVA at 0.85 pf lagging when operated at 125V (rms). The impedance of the feeder supplying the appliances is 0.01 + j0.08 Ohms. The voltage at the load end of the feeder is 125V (rms).
Two resistances having values of R and 3R are inparallel. R and the equivalent resistance are both integers. What are the possible values for R
A function generator is adjusted to give a 60 HZ sine wave with no-load (open-circuit) voltage of 3Vrms. When a 1k ohm load is place across the output terminals of the function generator, the output voltage drop to 8Vpp.
A 60 kVA, three-phase, wye-connected, 440 V, 60 Hz synchronous generator has a resistance of 0.15ohm and a synchronous reactance of 3.5ohm per phase. At rated load and unity power factor, calculate the percent voltage regulation.
Given the following voltage and current expressions, show the expression for the voltage across R2 in the circuit Note, R1=100 ohm, R2=300 ohm, and R3=200 ohm: a) v(t) = 10 cos (377t + pi/4) V b) i(t) = 5 cos (754t - pi/3) mA
Brown and Vranesic. Problem 6.28 - Repeat Problem 6.26 using T flip-flops. Design a three-bit counterlike circuit controlled by the input w. If w = 1. then the counter adds 2 to its contents, wrapping around if the count reaches 8 or 9.
Design an AC source system that can be used to power 120 Vrms, 240 Vrms, and 208 Vrms single phase devices depending upon the particular connection terminals. The system should have no individual sources with voltages larger than 120 Vrms.
An aluminum casting that has a mass of 10 kg sits on a steel surface. How much force will be necessary to get it to start sliding. The static coefficient of friction (mu) for aluminum on steel is 0.61.
1) A 1.5H inductor has a constant current of 2.5A. a) find the energy that it holds b) what is its voltage c) what is its energy after its current drops to zero and stays zero What power is dissipated when a 20 olhm resistor is connected to it
Design a circuit to multiply a 2-bit unsigned magnitude binary number by 1, 2, 3, or 4 to produce a 4-bit output
If the voltage drop across the capacitor is 115 volts and the power taken by the circuit is 922 watts, calculate a) the circuit current, b) the ohmic value of the resistor, c) the line voltage, d) the circuit power factor
The electric current in a microprocessor circuit is 0.360 uA. How many coulombs pass a given point in the circuit in 2.30 ms
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