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A three-phase round rotor synchronous generator, rated 16kV and 200MVA, has negligible losses and synchronous reactance of 1.65 per unit. It is operated on an infinite bus having a voltage of 15kV. The internal emf Ei and the power angle Delta of the machine are found to be 24kV (line-to- line) and 27.4o, respectively. a) Determine the line current and the three-phase real and reactive power being delivered to the system. b) If the mechanical power input and the field current of the generator are now changed so that the line current of the machine is reduced by 25% at the power factor of part a, find the new internal emf Ei and the power angle Delta. c) While delivering the reduced line current of part b, the mechanical power input and the excitation are further adjusted so that the machine operates at unity power factor at tits terminals. Calculate the new values of Ei and Delta.
A light comes on in a storeroom when either (or both) of two doors is open. 1. What logic function is most suitable for this operation 2. Draw a circuit to represent each function using a logic gate
How long will the cassette tape player operate at normal power? A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit.
A charged particle (charge q, mass m) is moving under the influence of a magnetic field B = B0 az. If the velocity vector of the particle is v = v a ax +- vy ay + vx az Show that the acceleration of this particle lies in the x-y plane.
An amplifier with a power gain of 3dB is to be characterized. The test apparatus provides a SNR of 20dB at the input and measures a SNR of 15dB at the output. Find the amplifier's NF. Specifications for (2), (3), (4) and (5).
A one-quarter wavelength piece of 75 ohm microstrip line has a capactive load of XC = 22 ohms. What impedance does a driving generator
A signal has a band width of 15 hz. The Signal is sampled , quantized and binary coded to obtained a PCM signal. Suppose the reconstruction pulse used is p(t)= rect ( (5t / Ts) - 0.5), where Ts= 1/ fs. Specify the equalizer filter E(f) to recover t..
find the number of years that the country can go without constructing a generating plant before the load exceeds the generating capacity. Assum a 5% annual growth rate in demand.
implement a circuit that generates VGA signals to draw a blue screen on your monitor in a resolution of 640x480. The following materials provide detailed descriptions of how VGA signals operate and some hints on how to design the VGA controller
The switch in the circuit has been in position a for a long time. At t=0 the switch is moved to position b. A.Calculate the initial voltage on the capacitor ifv = 200V , and i = 1.9mA . B. Calculate the final voltage on the capacitor. C. Calculate t..
Construct a truth table for a three variable function that includes minterms 1,4,6,7. Construct the corresponding K map and use it to find a minimal SOP expression for F.
David is driving at a steady 30 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.0 m/s2 at the instant when David passes. How far does Tina drive before passing David
Design a 7.5-V zener regulator circuit using a 7.5-V zener specified at 12mA. The zener has an incremental resistance r(z) = 30 ohms and a knee current of 0.5mA. The regulator operates from a 10-V supply and has a 1.2k-ohm load.
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