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In later years, motors improved and could be run directly from a 60 Hz power supply. As a result, 25 Hz power systems shrank and disappeared. However, there were many perfectly good working 25 Hz motors in factories around the country that owners were not ready to discard. To keep them running, some users created their own 25 Hz power in the plant using motor-generator sets. A motor-generator setconsists of two machines connected on a common shaft, one acting as a motor and the other acting as a generator. if the two machines have different numbers of poles. but exactly the same shaft speed, then the electrical frequency of the two machines will be different due to Equation. What combination of poles on the two machines could convert 60 Hz power to 25 Hz power?
f(se)=(n(sm)P)/120 (3-34)
a) By applying Kirchoff's voltage law to the output (DC) circuit loop determine the DC Load Line, i.e. an expression relating Id to Vds. Comment briefly on the significance on the result, with respect to the slope and x-axis intercept.
Make a plot of group velocity versus frequency for frequencies from 0 Hz to 500 kHz. Your plot should have 3 different curves for the three modes of propagation. Be sure to identify the modes and all cutoff and resonant frequencies clearly.
Current on the surface of inner conductor is 4I going into the page (positive current flows into the page) or is in negative z direction while current on outer conductor surface is 2I in the reverse direction or positive Z- direction. I is the gen..
Design the basic interface circuit (using an op amp) for a temperature sensor that covers a range of 0 degrees to 70 degrees C if the output of the sensor is 2 mV/1C and the ADC voltage range is 0 to 4 V.
Eigenfunctions and LTI systems, The eigenfunction property is only valid for LTI systems. Consider the cases of nonlinear and of time varying systems.
Suppose that you have graduated from College with an engineering degree and you start working for a local contracting company. For your first job, you are asked to design a circuit to duplicate the input-output response for small-amplitude inputs ..
a DC series machine ( 9.25 kW, 185 V, 1500 RPM) has Ra+Rsr = .3 ohms. The data for the magnetization curve are: Ia 0 10 20 30 40 50 60 Ea 10 50 106 156 184 200 208 Determine the terminal voltage at Ia = 20 amps, 40 amps and 60 amps.
design a 4 bit register with 4 different kinds of flip flops, that has at least 12 different functions. list clearly the functions. Do something creative, and say exactly your innovation. at least one flip flop should have some input besides a mul..
A synchronous motor is drawing 90 amps from 240V, 3 phase line at 0.8 pf leading with field current adjusted to 1.2 amps. The synchronous machine Xd is 1.3 ohms. Find a). The power angle delta
Each of the capacitance units is built of 4 similar 100V capacitors. Determine the capacitance of each capacitor.
Determine the position x and the tension in the cord that is required for equilibrium. The cord passes through the smooth ring at B and has an unstretched length of 6ft and stiffness of k = 50lb/ft.
If a silicon diffusion is doped with phosphorus (donors) at a concentration of 0.6 x 10^17/cm^3, what is the concentration of holes in this piece of silicon per cm^3 Assume ni = 1.45 x 10^10/cm^3, n = 1000 cm^2/V-s, p = 400 cm^2/V-s
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