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A 3 phase, 2 winding, 230kv/115kV, delta-wye, 50MVAtransformer has a series impedance of (4.0 at angle 81 degrees) %and core losses of 1.0% at rated voltage. When the transformer issupplying a load of 40MW at a power factor of 0.80 lagging at ratedvoltage, determine the percent efficiency and the percent voltage regulation.
A set of 4 µm wide windows are to be etched into a SiO2 film of thickness 0.8µm. a) Find the dimension of the window, as measured at the top of the oxide, after ideal isotropic etching (i.e. no overetch).
A 150-MVA 15/200-kV single-phase power transformer has a 0.018ohm resistance and a 0.075ohm reactance. The magnetizing impedance is j80 per unit. a.) Find the equivalent circuit referred to the low-voltage side of this transformer.
The Arrhenius equation is used to explain the dependance of the reaction rate coefficient, k, on temperature, T. Linearize the Arrhenius equation for the the temperature dependance of chemical reaction rate coefficients.
A 3-bit binary counter counts for 0 (000) to 7 (111). The counter moves to the next state with an input of x = 0 and stays in the same state with an input of x = 1. a. Draw the State Table and State Diagram for this 3-bit binary counter.
The current entering the positive terminal of a device is i(t)= 6e^-2t mA and the voltage across the device is v(t)= 10di/dtV. ( a) Find the charge delivered to the device between t=0 and t=2 s.
Write a MATLAB program that asks the user to enter a beginning time and an ending time (both in seconds) that define an interval of time over which we want to plot the velocity and acceleration of the aircraft.
Design a suitable low pass filter to remove the harmonic content of a 1KHz square wave to produce a 1KHz sine wave with less than1.5% harmonic distortion contributed by the first harmonicabove the fundamental.
A resistor on a Wheatstone bridge is replaced with a strain gage which has a nominal resistance of 120 Ohms and a gage factor of 2.06. The remaining resistors on this quarter-bridge Wheatstone bridge circuit are 120 Ohm fixed resistors.
A generator is rated at 500 MVA (three phase) and 22 kV (line-to-line). Its Y-connected windings have a reactance of 1.1 per unit. Find the ohmic value of the reactance of the windings. What is the per unit value if we change the base to 200 MVA a..
A plumber is using an electric drill in a basement with a concrete floor.Assume his total body resistance from hands to feet is 1k ohm.The drill has a metal case that is connected to the ground wire in the 3-prong plug.
the color code on a resistor specifies the resistance as4.7kOhms. A multimeter measured the resistance as 4.688kOhms. What is the nominal resistance of the resistor
A series connected DC motor has R_F + R_A = 11.5 ohm and draws 1 A of current from a DC voltage source with V_T = 18 V while running at 1000 rpm. What is the speed and developed torque when drawing 0.75 A of current
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