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Assume that the base voltage is 4600 V in the system of Problem 2.11, and that 50 MVA is the corresponding apparent power base. Repeat Problem 2.11 using per unit values.
Problem 2.11
A load of 30 MW at 0.8 p.f. lagging is served by two lines from two generating sources. Source 1 supplies 15 MW at 0.8 p.f. lagging with a terminal voltage of 4600 V line-to-line. The line impedance is (1.4 + jl.6) Ω per phase between source 1 and the load, and (0.8 +jl) Ω per phase between source 2 and the load. Find
a) The voltage at the load terminals
b) The voltage at the terminals of source 2, and
c) The active and reactive power supplied by source 2.
A four-pole dc generator has magnetic flux of 0.06 Wb/pole, a rotational speed of 1800 rpm, full load current of 40 A, and is simplex lap wound. The generator efficiency is 91%. Pole face coverage is 78%.
Two batteries with voltages in opened circuit V1 and V2 and with internal resistencies R1 and R2, respectively are connected in parallel with themselves and with a load resistance R. a) Find the current that goes through the load resistance.
Identical 4.0-µC charges are placed on the y axis at y = ±4.0 m. Point A is on the x axis at x = +3.0 m. Determine the electric potential of point A ( Relative to zero at the origin)
What does an amplifier do and why is one needed in a radio system and what is the purpose of a mixer? Include a discussion of sidebands in your answer.
Given a buck-boost converter (with ideal components): 8 V. Vin 40 V.; Vo = 15 V. (regulated); C = 470 micro Farads; and fs = 20 KHz. (a) Determine minimum L to ensure CCM operating mode if Po 2 W.;
Show that the electric field at a point of the model is nin-2 times the field at the corresponding point of the actual system.
Convert the designed prototype filter to highpass filter with cutoff frequency f_C=10,000 Hz, with 30 db attenuation at f_S=1000 Hz. Determine the transfer function of the filter.
A battery has a short-circuit current of 20 A and an open-circuit voltage of 12 V. If the battery is connected to an electric bulb of resistance 2 ohm, calculate the power dissipated by the bulb.
build a cicuit that must be able to operate a 3 amp load of the LED while being able to operate at voltages around 3V or 6V. It must be able to keep the LED on constantly while also being able to pulse the LED.
a 10 khz sinsudal signal is used to amplitude modulate a sinsoidal carrier frequency of 50 khz the number of frequency components that would be included in the resulting DSP AM waveform would be
Three identical impedances of (12+j15)ohms are connected in wye to a 550V balanced three phase source. Determine, (a)the magnitude of the line currents. (b) the total power dissipated for the three phases. (c)the total reactive power. (d)the power..
design the controller and estimator so that the closed-loop unit step response to a command input has a rise time tr
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