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A three phase 4.157kv 60hz power system serves a 2880kva load pf=.8 lagging. Draw the ac equivalent circuit with load impedance element equated. The load is delta connected. solve for all the current (6 total).
A voltage v(t) = 359.3 cos(wt) is applied to a load consisting of a 10 resistor in parallel with a capacitive reactance XC = 25. Calculate The instantaneous power absorbed by the resistor The instantaneous power absorbed by the capacitor
A small circular parabolic reflector, often referred to as dish, is now being advertised as a TV antenna for direct broadcast. Assuming the diameter of the antenna is 1 meter, the frequency of operation is 3 GHz, and its aperture efficiency is 68%
Using the Nth order term only of the transfer polynomial, find the Nth order relationship for the Nth order products.
The power factor of a load connected to a 120-V 60-Hz source is raised from 0.866 lagging to 0.966 leading by connecting a 110.5-?F capacitor in parallel with the load. Determine the load current I1 and the circuit current IT.
Assume the acceptable deviation is +- 5.8%. Thus, a nominal rms voltage of 120 V will range from 113 to 127 V. Suppose the line to line voltage at Customer A is 13.8kV, the load at customerA consumes complex power (1.2+j1.2)x 10^6 W.
(1) Explain what happens in a series circuit when the frequency makes Xc equal to XL. Does it have a name (2) What is the relationship between Ic and IL at Is minimum (3) Why is the source current, Is, minimum at certain frequency
A lamp of 100 candela is placed 1 m below a plane mirror which reflects 90% of light falling on it. The lamp is hung 4 m above ground. Find the illumination.
What resistance must be connected in series with a heater rated at 150mA with hot resistance of 320 ohm in order to operate it safely from a 117-V source. What power rating must this resistor have
Write the formula for the magnetization volume current density J M and magnetization surface current density JMS in terms of magnetization vector M. 4. A sphere has permanent magnetization where is a positive constant.
Let a crappy voice channel occupy 1kHz. To ensure no interefence between channels due to nonideal bandpass filters add a 3.0kHz spacing between channels. How many simultaneous voice channels can you have if allocated a 87MHz bandwidth total
An amplifier with a voltage gain of +30db, an input resistance of 8 k ohms, and an output resistance of 2 k ohms is used to drive a 2 k
Compare a lumped element model of a lossless transmission line (single L and C) with the distributed model. Use the following values for the transmission line in this comparative analysis.
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