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A direct current source is required to supply a controlled current of 20A to a load in which the resistance varies from 0 to 12 ?. The source consists of a 208 V(L-L) , 60 Hz , there -phases , a controlled bridge rectifier, and a large series inductor .A) Determine the maximum and minimum values of the firing angleB) Determine the maximum and minimum values of the source power factor.C) Determine the maximum and minimum values of the source KVA.
The donor concentration in a silicon sample at 300K is ND = 1.2 x 1015 cm-3. 1 x 1016 cm-3 acceptor atoms are added to form a compensated p-type semiconductor so that the Fermi level is 0.26 eV above the valence band edge.
Why is quality a difficult term to define. how can we improve our understanding of quality?
Write an equation relating the donor-atom concentration, the acceptor-atom concentration, the free-electron concentration, and the hole concentration for a doped semiconductor.
A table of values of the normalized magnitude of the voltage phasor on the line as a function of position on the line, with the normalization done relative to the value of the voltage magnitude at the voltage maximum point on the line.
The reactance in ohms of a capacitor at frequency of 500 Hz is 145 ohms; what is the value of the capacitor in uF. The reactance in ohms of a capacitor of 10 uF at a FREQUENCY of 200 Hz is
A certain 15 V dry-cell battery, completely discharged, requires a current of 100 mA for 3 hr to completely recharge. What is the energy storage capacity of the battery, assuming the voltage does not depend on its charge status
Watts in Cassette Players, A walker's cassette tape player uses 4 AA batteries in series to provide 6V to the player circuit. The four alkaline battery cells store a total of 200 watts-second of energy.
Market research and a competitive analysis are typically used in order to determine the feasibility of a new technology. How you could use advanced market research in order to remain competitive
A chest radiograph of 43cm x 35cm is to be viewed on a v monitor wih a resolution of 3 lp/mm. what minimal bandwidth is necessary for the monitor if the image is displayed at 60Hz non-interlaced
A mixer stage has a noise figure of 20 dB. This mixer stage is preceded by an amplifier which has a noise figure of 9 dB and an available power gain of 15 dB. what is The overall noise figure referred to the input.
In a two-winding transformer N1 = 2000 and N2 = 500 and the supply voltage V1 = 1200 V. The transformer has winding resistances R1 = 2.0ohm and R2 = 0.125ohm , and leakage reactances X1 = 8.0 and X2 = 0.5ohm
a) Determine the numerical value of To. b) What is the average value of f(t) over the interval 0≤t≤To c) Determine the amplitude of the fifth-harmonic component. d) Determine the phase of the fifth-harmonic component.
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