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A 150kVA, 2080/208V, 60Hz, Y/Y connected, three-phase, step-down transformer consists of three identical single-phase transformers. Each transformer has the following parameter values: Rl = 0.45-ohm, Xl = 2.2-ohm , R2 = 4.5m-ohm , X2 = 22m-ohm, RCl = 10k-ohm, and Xml = 8k-ohm. The load on the transformer is 120kVA, 90kW (lagging) at the rated terminal voltage. Determine: a) the primary voltage, and b) the efficiency of the three-phase transformer.
The schematic of the traffic light controller
A Y-connected load has an impedance of 25+j12 ohms in each phase. It is desired to raise the load power factor to .95 lagging. (a) What size capacitor should be placed in parallel with each phase impedance if frequence = 60 Hz
Compute the polar form of the impedances shown below in rectangular form in parts a and b, and compute the rectangular form of the impedances shown below in polar form in parts c and d
Explain why it is unlikely one would encounter a circuit exhibiting a critically damped response in practice. What impact would time and temperature have on a supposedly "critically damped" circuit
a)Determine I, VR, and Vc in phasor form. b)Calculate the total power factor, and indicate whether it is leading or lagging. c)Calculate the average power delivered to the circuit. d)Draw the impedance diagram e)draw the phasor diagram of the voltage..
Find out the birthday (month and day but not year) of a randomly chosen person. What is the sample space of the experiment. How many outcomes are in the event that the person is born in July
In the movement of a robot arm, the arm is commanded to go from position 1 to position 5. Discuss the rise time, the overshoot, the settling time, and the steady-state error as it applies to the movement of a robot arm
Finding rms current through Capacitor and Inductor, A circuit consists of a sine wave signal generator and a reactive component (L or C). The output of the generator is a sine wave with a peak amplitude of 8.8 volts at a frequency of 10.0 kHz.
A 3 phase 50hz star connected motor has rotor resistance and stand still reactance of 0.025ohm and 0.35 ohm respectively. The full load slip is 5% calculate the resistance per phase of a star connected rheostat
if you had a calculated quality from specific volume data and you were asked to write down the equation for specific internal energy and had to find use a given specific internal energy (or specific enthalpy) and use to get a specific volume.
Consider two Functions F = E(1,2,3,5,7,9) and G = E(0,5,7,8,9,11,13,15) a) Use K-maps to minimize the function Fb) Use K-maps to minimize the function G c) How many total terms and literals are present in the two equations
What sort of waveform does the input signal have? Is the input signal periodic or non-periodic? If the input waveform is non-periodic, what is its pulse width?
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