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A single-phase two-winding transformer is rated 20kVA, 480/120 V, 50 Hz. A source connected to the primary winding supplies an impedance load connected to the secondary winding. The load absorbs 15 kVA at 0.8 p.f. lagging when the load voltage is 118 V. Assumethat the transformer is ideal and calculate the following:
a) Change the power factor to 0.2 lagging and 0.2 leading condition. Calculate the reactive power for the ideal transformer. What kind of effect may take place due to these changes?
b) Plot the complex power during 0.8 lagging, 0.2 lagging and 0.2 leading condition as a function of active power for the ideal transformer.
c) Assume the transformer is not ideal but has the parameters: r1 = 0.1 , x1 = 0.2 , r2 = 0.01 , x2 = 0.02 and calculate the percent voltage regulation.
Derive an iterative formula for finding the roots of cos(x) = x with Newton's method. Starting with an initial guess of x = 5 radians, determine the estimate of the root after five iterations. How many iterations are needed to get f
The following represent solutions of the transmission line differential equations for some arbitrary function f(u): V(z,t) = 60 cos(1000t -5z) - 120 pi f (2t + z/100+12) V I(z,t) = 2 pi f (2t +z/100 +12) - cos (1000 t -5z) A a) what is the forward pr..
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a. Sketch the spectrum of the original signal and the sampled signal from 0 kHz and 25 kHz. b. Sketch the recovered analog signal spectrum if an ideal lowpass filter with a cutoff frequency of 4 kHz is used to filter the sampled signal.
An infinitely long wire is placed in a space with relative permeability of 9000 carrying current of 1.9 A in the +y direction. What is the magnitude of the magnetic flux density at (0.03,0,0) [meters] in units of Tesla
Design a four pole lowpass filter with Sallen-Key topology and a Butterworth characteristic. The cutoff frequency of the filter must be 16 kHz.
A set of 4 µm wide windows are to be etched into a SiO2 film of thickness 0.8µm. a) Find the dimension of the window, as measured at the top of the oxide, after ideal isotropic etching (i.e. no overetch).
A firefighter of mass 85 kg slides down a ver tical pole with an acceleration of 5 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him
3) What is the RMS voltage of the source in a single loop series circuit if Irms = 1A-30° and Ztotal = 100 65° 4) What is the power dissipated by an electric heater with a resistance of 20? drawing a current waveform of i(t) = 10 sin(60t) Amps
consider a scenario where there is a direct path from bs to ms,while other multipath components are reflected from a nearby mountain range.the distance between the bs and ms is 10km and the distance between the bs and mountain range as well as the..
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