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A 230kVA, 2300/230V, 60 Hz, step-down transformer has the following parameters. RH =1.2-ohm, XH =3-ohm, RL =12m-ohm, XL =30m-ohm, Rh+c=2k-ohm, , Xm =1.8k-ohm. If the transformer operates at half load with unity power factor, what is the voltage regulation and efficiency. Repeat the problem with half load with 0.8 power factor lag load and 0.8 power factor lead. Compare the results for all the three loads.
A high-pass filter with C=30pF. R= 40 kohm A) What is the cutoff frequency The output of this filter is connected to an amplifier with an input resistance of 60 kohm. B) Sketch and label the new circuit. C) What is the new cutoff frequency
What is the problem you are investigating and explain the issue, its history, the impact it makes locally
Construct a table showing the current for values of time between 0 and 9 hours at intervals of 1 hour.Hence draw a graph of i against t for 0 is smaller or equal to t is smaller or equal 9.(cannot type in proper inequality symbols)
Determine the ROM size and contents to implement a function which converts a sign and magnitude number from -5 to +6 to two's complement format.
An Aluminum wire with a square cross section 2mm on a side is carrying a current of 1.5amps. Aluminum has a resistivity of 2.69*10^-6 ohm-cm and an atomic volume of 10cc/mol. Assuming aluminum has three free electrons per atom
A stream can represent many different kinds of sources and destinations, including disk files, devices, other programs, and memory arrays. Discuss how to use the different data stream classes to move data to/from files.
In a balanced three-phase wye-wye system, the load impedance is 10 +j1 Ohms. The source has phase sequence abc and the line voltage Vab = 220 Vrms /30°. The load voltage is VAN = 120 Vrms /0°.
the doping level of N-type semiconductor is ND = 5x10^19 cm^-3. Determine the room-temperature position of the Fermi level (with respect to the borrom of the conduction band) if the semiconductor is Si (Nc = 2.86x10^19).
Calculate in polar form the sequence components of unbalanced lineto-neutral voltages and calculate in polar form the phase currents corresponding to the sequence components
Tell us about a time when you failed to meet a deadline. What were the repercussions?
Efficiency in a power transformer is 98.6 percent when loaded such that its core losses equal the copper losses. Calculate the per unit resistance of this transformer.
For a person with a hematocrit of 0.45, the arterial blood has an oxygen partial pressure of 100 mmHg. (1) What is the concentration of dissolved oxygen in the blood (2) How does your answer in (1) compare to the oxygen requirement
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