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A 5-kVA, 480:120-V, two-winding, 60-Hz, single-phase transformer has an efficiency of 95% while delivering rated load at rated voltage and 0.8 power factor lagging. This transformer is to be connected as an autotransformer to step down a 600-V source to 480 V.
(a) Draw a schematic connection diagram as an autotransformer.
(b) Find the maximum kVA rating as an autotransformer.
(c) Compute the efficiency as an autotransformer delivering its rated kVA at 480 V and 0.8 power factor lagging.
the paint formerly used on some storage tanks contained aluminum powder which reflected heat from the surface of the
If the container holds 1.3 kg of dry air, what are the final specific and relative humidities of the air in the container? what is the dew point?
Plot of the Fermi distribution function at two different temperatures. Calculate the Fermi timction at 6.5 eV if EF=6 .25 eV and T=300 K. Repeat for T=950 K assuming that the Fermi energy does not change. Plot the energy dependence of the ele..
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The constant losses from a no-load run as a motor are given to be 220 W, of which 70 W represents friction and wind age losses. Calculate the efficiency of the induction generator.
Construction will take two years, and the capital will be paid in two equal increments, at the end of the first and second years. The savings (income) can be taken as paid at the end of each year. Production will start on the completion of constru..
In terms of heat treatment and the development of microstructure, what are two major limitations of the iron-iron carbide phase diagram?
Ethylene and propylene are valuable monomers. A key step in the recovery of these materials is fractionation of the olefin from the corresponding paraffin (ethane or propane). These fractionation steps require refrigeration of the overhead condens..
One compartment is evacuated, the other contains steam at 7.5 bar, 300 °C. The latches are removed and the gas expands to fill the entire volume of the cylinder. When the system reaches equilibrium, its pressure is 1 bar. Determine the final tempe..
List the formulas of three soluble bromide salts and three insoluble bromide salts. Do the same exercise for sulfate salts, hydroxide salts, and phosphate salts (list three soluble salts and three insoluble salts).
Water at 1 bar, 20 °C is heated at const P to produce steam with quality 95%. What is the amount of heat? What is the final state if the amount of heat is 2100 kJ/kg?
According to the paper entitled "Recursive tracking of vascular networks in angiograms based on the detection-deletion scheme" (IEEE Trans. Med. Imaging 12: 334-341, 1993), what is the purpose of deleting a vessel segment from the image immediatel..
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