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A three-phase, 2000-kVA, 12-kV, 1800-rpm synchronous generator has a synchronous reactance of 20 ohms per phase and negligible armature resistance.
a. The field current is adjusted to obtain the rated terminal voltage at open circuit. Determine the excitation voltage.
b . A short circuit occurs across the machine terminals. Find the stator current.
c. The synchronous machine is connected to an infinite bus. The generator delivers rated current at 0.8 PF lagging. Determine the excitation voltage.
d. Calculate the maximum power the synchronous machine can deliver fro the excitation current.
Rayleigh Scattering. Calculate the % increase is attenuation due to Rayleigh scattering exhibited by light having a free-space wavelength 1535 nm as compared to light having a free space wavelength 1550 nm. Provide your answer in units of [%] and ..
A one-dimensional infinite potential well with a width of 12 Ao contains an electron. (a) Calculate the first two energy levels that the electron may occupy. (b) If an electron drops from the second energy level to the first, what is the wavelengt..
Step-down transformer
Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz,
What are the incremental savings that result from increasing the efficiency of a PV collector by 1% in terms of collector area and costs? Assume that the PV module represents about 50% of the total PV system cost.
The total sunlight at noon on a clear summer day is just over 1KW/m^2. Assuming a solar panel with 20% efficiency, and an output voltage of 20V, estimate the output current of a one square meter panel in full sunlight.
The frequencies of the tones are 100 Hz, 300 Hz, and 450 Hz. The sampling rate is 1 kHz. Describe a low pass, a band pass, and a high pass filter that could be used to detect the individual tones.
The circuit will have as inputs a minimum of two inputs; the binary equivalent of two decimal numbers of not greater than (10,000)10. The circuit will produce a minimum of two outputs, the quotient and the remainder.
Express the sequence x(n)={1 n=0 , 2 n=1 , 3 n=2 , 0 else} 1- Express the signal as a sum of weighted and shifted unit impulse sequence. 2- Express the signal as a sum of weighted and shifted unit step sequence
1. Determine the minimum value of gain K when Gc(s)=K, so that the steady-state effect of a unit step disturbance Td(s)=1/s is less than or equal to 5% of the unit step (y(inf)=0.05). 2. Determine whether the system using the gain of part 1 is stab..
Describe your understanding of the similarity and differences between MOSFET and BJT, in terms of 1) terminal behavior, 2) i-v characteristics, 3) amplifier configuration, 4) small-signal equivalent models and 5) biasing technique.
A 450 piece/hr 10 hr B 500 piece/hr 8 hr A set of unsharpen ed tools costs $1,500 and can be ground 15 times. The cost of each grinding is $20. The time required to change and reset the tools is 2 hours, and such changes are made by a tool-setter.
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