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A balanced positive-sequence wye-connected 60-Hz three-phase source has line to line voltages of VL = 208V rms . this source is connected to a balanced wye connected load. Each phase of the load consists of an impedance of 30 + j40 ohms. Find the line to neutral voltage phasors, the line to line voltage phasors , the power and the reactive power delivered to the load. Assume that the phase of Van is zero.
Suppose the volume X occupied by a capacitor is A*d where A is the total area of the dielectric layers and d is the thickness of each dielectric layer (this assumes that the metal plates are infinitely thin).
You need to upgrade your crystallizer. Your company bought a new 1000 ft2 crystallizer 5 years ago for $450,000. You believe that your company has expanded sufficiently to need a 5000 ft2 crystallizer. What is the price in today's dollars
Suppose that you wish to offer a voice over IP wireless service. The target packet error rate (or drop rate) is 10^-3 and you determine that if the signal is confined to within a coherence band, about 20% of the packets are dropped due to fading.
Consider a linearly graded Si p-n junction. Find a relation for the potential across the depletion region. Hint: Start from equation 29 in chapter 3 of the text book. Integrate the electric field to find the potential.
An inventor claims to have perfected an engine that wil produce power from energy transferred as heat from a 1000K flame. Energy wil be rejected as heat to the ground at 290 K. A 75 percent energy conversion efficiency is claimed.
A factory is to be supplied with 408Y/277 3 phase, 4 wire electrical service. The total estimated single-phase load is 25 kW, at .9 lagging power factor. The total estimated three-phase load is 250 kW at .85 lagging power factor.
To prevent this, a device is placed across the solenoid (inductor) that can hold the voltage to a safe value, say 40V, during transients. If the activating current in the solenoid is 1 amp and its inductance is 100uH
A base-station cellular communicationsystem utilizes arrays of f/2 dipoles as transmitting and receiving antennas. Assuming that each element is lossless and that the input power to each of the f/2 dipoles is 1 watt, determine at 1,900 MHz
For a short transmission line having a series impedance Z=R+jXL, write the relationships between the sending-end and the receiving-end voltages and currents. Assuming a line with R=0, XL=20 ohm feeding a 1MW load at 0.95 power factor
A 415V to 11 kV transformer has a rating of 200 kVA. The winding resistance and leakage reactance when referred to the primary are 0.014 and 0.057 ohms respectively.
Write the VHDL ARCHITECTURE file for the Y(5) output only for a 8-to-1 demultiplexer. The inputs are D, the selects S0-S2, and the outputs Y(0)-Y(7). The select lines are BIT_VECTOR types, the data is BIT type and the outputs are BIT_VECTOR types.
Three single-phase, two-winding transformers, each reated 450 MVA, 20 kV/288.7 kV with leakage reactance Xeq=0.12 per unit, are connected to form a three-phase bank. The high voltage windings are connected in Y with solidly grounded neutral.
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