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Three single-phase transformers, each is rated at 10 kVA, 400/300V are connected as wye- delta configuration. Compute the following:
a. Rated power of the transformer bank
b. Line-to-line voltage ratio of the transformer bank
A) A sheet of paper has a charge of 1 nC/m^2. Estimate the electric field on its surface and show it in a diagram. B) A copper plate has a radius of 10 cm. It has a total charge of 1 nC. Will the air around the plate break down.
Explain three different algebraic methods that can be used to minimize equations. In your explanation write generalized equations to show how each method is used. Notice the requirement is to explain, don't just write them down.
The electron and hole concentrations as a function of energy in the conduction band and valence band peak at a particular energy. Consider silicon and assume Ec - EF =0.20 eV. Determine the energy, relatiive to the band edges
Determine(using the thevenin equivalent circuit) what size resistor should be placed betweent R4 and R5 to ensure that resistor receives the maximum power possible from the power source
If wind power at this site varies as the ratio of heights raised to the 1/7 power, compute the ratio of power in the wind that appears at the tip of the top blade relative to the power that appears at the elevation at the tip of the bottom blades.
One hundred adults were interviewed in a telephone survey. Of interest was their opinions regarding the loan burdens of college students and whether the respondent had a child currently in college.
If an ice cream cone is 6 inches tall and its rim has a diameter of 2 inches, determine the weight of ice cream that can fit in the cone assuming the ice cream above the cone is a perfect hemisphere.
A balanced set of Y-connected resistors is to be connected to the slip rings in order to limit the rated-voltage starting current to 200 percent of its rated value. What resistance must be chosen for each leg of the Y connection? What will be the ..
Suppose you need an 8-bit counter, and an 8-bit shift register. How would you go about creating these. Could you create them using the counter and shift register you created already.
A complex voltage waveform is composed of harmonics and is described by the following expression: v = 200 sing(ωt + π/6) + 150 sin (2ωt - π/3) + 75sin(3ωt + π/5) V, The fundamental frequency is 500 Hz. Determine the current expression flowing in each..
Calculate the capacitance per phase of a three-phase, double circuit lines as shown in fig 2.59. The diameter of each conductor is 1.8 cm.
A 20kW, 250V, self-excited dc shunt generator is driven at its rated speed of 1200rpm and it is delivering rated power at rated terminal voltage. Its armature-circuit resistance is 0.15-ohm, and the field current is 2 A.
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